From 819ea5cabe4045ffe7e2d0c1920a4d85ab5ac209 Mon Sep 17 00:00:00 2001
From: Boone Gorges <boonebgorges@git.wordpress.org>
Date: Wed, 18 Mar 2015 13:27:15 +0000
Subject: [PATCH] Move  and  tests to their own files.

git-svn-id: https://develop.svn.wordpress.org/trunk@31812 602fd350-edb4-49c9-b593-d223f7449a82
---
 tests/phpunit/tests/term.php              | 1277 ---------------------
 tests/phpunit/tests/term/wpInsertTerm.php |  636 ++++++++++
 tests/phpunit/tests/term/wpUpdateTerm.php |  656 +++++++++++
 3 files changed, 1292 insertions(+), 1277 deletions(-)
 create mode 100644 tests/phpunit/tests/term/wpInsertTerm.php
 create mode 100644 tests/phpunit/tests/term/wpUpdateTerm.php

diff --git a/tests/phpunit/tests/term.php b/tests/phpunit/tests/term.php
index dd7e3730e0..6f5b8a46a1 100644
--- a/tests/phpunit/tests/term.php
+++ b/tests/phpunit/tests/term.php
@@ -6,1207 +6,6 @@
 class Tests_Term extends WP_UnitTestCase {
 	var $taxonomy = 'category';
 
-	function setUp() {
-		parent::setUp();
-
-		_clean_term_filters();
-		// insert one term into every post taxonomy
-		// otherwise term_ids and term_taxonomy_ids might be identical, which could mask bugs
-		$term = rand_str();
-		foreach(get_object_taxonomies('post') as $tax)
-			wp_insert_term( $term, $tax );
-	}
-
-	function deleted_term_cb( $term, $tt_id, $taxonomy, $deleted_term ) {
-		$this->assertInternalType( 'object', $deleted_term );
-		$this->assertInternalType( 'int', $term );
-		// Pesky string $this->assertInternalType( 'int', $tt_id );
-		$this->assertEquals( $term, $deleted_term->term_id );
-		$this->assertEquals( $taxonomy, $deleted_term->taxonomy );
-		$this->assertEquals( $tt_id, $deleted_term->term_taxonomy_id );
-	}
-
-	function test_wp_insert_delete_term() {
-		// a new unused term
-		$term = rand_str();
-		$this->assertNull( term_exists($term) );
-
-		$initial_count = wp_count_terms( $this->taxonomy );
-
-		$t = wp_insert_term( $term, $this->taxonomy );
-		$this->assertInternalType( 'array', $t );
-		$this->assertFalse( is_wp_error($t) );
-		$this->assertTrue( $t['term_id'] > 0 );
-		$this->assertTrue( $t['term_taxonomy_id'] > 0 );
-		$this->assertEquals( $initial_count + 1, wp_count_terms($this->taxonomy) );
-
-		// make sure the term exists
-		$this->assertTrue( term_exists($term) > 0 );
-		$this->assertTrue( term_exists($t['term_id']) > 0 );
-
-		// now delete it
-		add_filter( 'delete_term', array( $this, 'deleted_term_cb' ), 10, 4 );
-		$this->assertTrue( wp_delete_term($t['term_id'], $this->taxonomy) );
-		remove_filter( 'delete_term', array( $this, 'deleted_term_cb' ), 10, 4 );
-		$this->assertNull( term_exists($term) );
-		$this->assertNull( term_exists($t['term_id']) );
-		$this->assertEquals( $initial_count, wp_count_terms($this->taxonomy) );
-	}
-
-	public function test_wp_insert_term_taxonomy_does_not_exist() {
-		$found = wp_insert_term( 'foo', 'bar' );
-
-		$this->assertTrue( is_wp_error( $found ) );
-		$this->assertSame( 'invalid_taxonomy', $found->get_error_code() );
-	}
-
-	public function test_wp_insert_term_pre_insert_term_filter_returns_wp_error() {
-		add_filter( 'pre_insert_term', array( $this, '_pre_insert_term_callback' ) );
-		$found = wp_insert_term( 'foo', 'post_tag' );
-		remove_filter( 'pre_insert_term', array( $this, '_pre_insert_term_callback' ) );
-
-		$this->assertTrue( is_wp_error( $found ) );
-		$this->assertSame( 'custom_error', $found->get_error_code() );
-	}
-
-	public function test_wp_insert_term_term_0() {
-		$found = wp_insert_term( 0, 'post_tag' );
-
-		$this->assertTrue( is_wp_error( $found ) );
-		$this->assertSame( 'invalid_term_id', $found->get_error_code() );
-	}
-
-	public function test_wp_insert_term_term_trims_to_empty_string() {
-		$found = wp_insert_term( '  ', 'post_tag' );
-
-		$this->assertTrue( is_wp_error( $found ) );
-		$this->assertSame( 'empty_term_name', $found->get_error_code() );
-	}
-
-	public function test_wp_insert_term_parent_does_not_exist() {
-		$found = wp_insert_term( 'foo', 'post_tag', array(
-			'parent' => 999999,
-		) );
-
-		$this->assertTrue( is_wp_error( $found ) );
-		$this->assertSame( 'missing_parent', $found->get_error_code() );
-	}
-
-	public function test_wp_insert_term_unslash_name() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$found = wp_insert_term( 'Let\\\'s all say \\"Hooray\\" for WordPress taxonomy', 'wptests_tax' );
-
-		$term = get_term( $found['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 'Let\'s all say "Hooray" for WordPress taxonomy', $term->name );
-	}
-
-	public function test_wp_insert_term_unslash_description() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
-			'description' => 'Let\\\'s all say \\"Hooray\\" for WordPress taxonomy',
-		) );
-
-		$term = get_term( $found['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 'Let\'s all say "Hooray" for WordPress taxonomy', $term->description );
-	}
-
-	public function test_wp_insert_term_parent_string() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
-			'parent' => 'foo1',
-		) );
-
-		$term = get_term( $found['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		// 'foo1' is cast to 0 in sanitize_term().
-		$this->assertSame( 0, $term->parent );
-	}
-
-	public function test_wp_insert_term_slug_empty_string() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
-			'slug' => '',
-		) );
-
-		$term = get_term( $found['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 'quality', $term->slug );
-
-	}
-
-	public function test_wp_insert_term_slug_whitespace_string() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
-			'slug' => '  ',
-		) );
-
-		$term = get_term( $found['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 'quality', $term->slug );
-	}
-
-	public function test_wp_insert_term_slug_0() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
-			'slug' => 0,
-		) );
-
-		$term = get_term( $found['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 'quality', $term->slug );
-	}
-
-	/**
-	 * @ticket 17689
-	 */
-	public function test_wp_insert_term_duplicate_name() {
-		$term = $this->factory->tag->create_and_get( array( 'name' => 'Bozo' ) );
-		$this->assertFalse( is_wp_error( $term ) );
-		$this->assertTrue( empty( $term->errors ) );
-
-		// Test existing term name with unique slug
-		$term1 = $this->factory->tag->create( array( 'name' => 'Bozo', 'slug' => 'bozo1' ) );
-		$this->assertFalse( is_wp_error( $term1 ) );
-
-		// Test an existing term name
-		$term2 = $this->factory->tag->create( array( 'name' => 'Bozo' ) );
-		$this->assertTrue( is_wp_error( $term2 ) );
-		$this->assertNotEmpty( $term2->errors );
-
-		// Test named terms ending in special characters
-		$term3 = $this->factory->tag->create( array( 'name' => 'T$' ) );
-		$term4 = $this->factory->tag->create( array( 'name' => 'T$$' ) );
-		$term5 = $this->factory->tag->create( array( 'name' => 'T$$$' ) );
-		$term6 = $this->factory->tag->create( array( 'name' => 'T$$$$' ) );
-		$term7 = $this->factory->tag->create( array( 'name' => 'T$$$$' ) );
-		$this->assertTrue( is_wp_error( $term7 ) );
-		$this->assertNotEmpty( $term7->errors );
-		$this->assertEquals( $term6, $term7->error_data['term_exists'] );
-
-		$terms = array_map( 'get_tag', array( $term3, $term4, $term5, $term6 ) );
-		$this->assertCount( 4, array_unique( wp_list_pluck( $terms, 'slug' ) ) );
-
-		// Test named terms with only special characters
-		$term8 = $this->factory->tag->create( array( 'name' => '$' ) );
-		$term9 = $this->factory->tag->create( array( 'name' => '$$' ) );
-		$term10 = $this->factory->tag->create( array( 'name' => '$$$' ) );
-		$term11 = $this->factory->tag->create( array( 'name' => '$$$$' ) );
-		$term12 = $this->factory->tag->create( array( 'name' => '$$$$' ) );
-		$this->assertTrue( is_wp_error( $term12 ) );
-		$this->assertNotEmpty( $term12->errors );
-		$this->assertEquals( $term11, $term12->error_data['term_exists'] );
-
-		$terms = array_map( 'get_tag', array( $term8, $term9, $term10, $term11 ) );
-		$this->assertCount( 4, array_unique( wp_list_pluck( $terms, 'slug' ) ) );
-
-		$term13 = $this->factory->tag->create( array( 'name' => 'A' ) );
-		$this->assertFalse( is_wp_error( $term13 ) );
-		$term14 = $this->factory->tag->create( array( 'name' => 'A' ) );
-		$this->assertTrue( is_wp_error( $term14 ) );
-		$term15 = $this->factory->tag->create( array( 'name' => 'A+', 'slug' => 'a' ) );
-		$this->assertFalse( is_wp_error( $term15 ) );
-		$term16 = $this->factory->tag->create( array( 'name' => 'A+' ) );
-		$this->assertTrue( is_wp_error( $term16 ) );
-		$term17 = $this->factory->tag->create( array( 'name' => 'A++' ) );
-		$this->assertFalse( is_wp_error( $term17 ) );
-		$term18 = $this->factory->tag->create( array( 'name' => 'A-', 'slug' => 'a' ) );
-		$this->assertFalse( is_wp_error( $term18 ) );
-		$term19 = $this->factory->tag->create( array( 'name' => 'A-' ) );
-		$this->assertTrue( is_wp_error( $term19 ) );
-		$term20 = $this->factory->tag->create( array( 'name' => 'A--' ) );
-		$this->assertFalse( is_wp_error( $term20 ) );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_not_allow_duplicate_names_when_slug_is_a_duplicate_of_the_same_term_in_non_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'slug' => 'foo',
-		) );
-
-		$this->assertWPError( $t2 );
-		$this->assertSame( 'term_exists', $t2->get_error_code() );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_not_allow_duplicate_names_when_slug_is_a_duplicate_of_a_different_term_in_non_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = $this->factory->term->create( array(
-			'name' => 'Bar',
-			'slug' => 'bar',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t3 = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'slug' => 'bar',
-		) );
-
-		$this->assertWPError( $t3 );
-		$this->assertSame( 'term_exists', $t3->get_error_code() );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_allow_duplicate_names_when_a_unique_slug_has_been_provided_in_non_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'slug' => 'foo-unique',
-		) );
-
-		$this->assertFalse( is_wp_error( $t2 ) );
-
-		$t2_term = get_term( $t2['term_id'], 'wptests_tax' );
-		$this->assertSame( 'foo-unique', $t2_term->slug );
-		$this->assertSame( 'Foo', $t2_term->name );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_not_allow_duplicate_names_when_the_slug_is_not_provided_in_non_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax' );
-
-		$this->assertWPError( $t2 );
-		$this->assertSame( 'term_exists', $t2->get_error_code() );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_not_allow_duplicate_names_when_slug_is_a_duplicate_of_the_same_term_in_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'slug' => 'foo',
-		) );
-
-		$this->assertWPError( $t2 );
-		$this->assertSame( 'term_exists', $t2->get_error_code() );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_not_allow_duplicate_names_when_slug_is_a_duplicate_of_a_different_term_at_same_hierarchy_level_in_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = $this->factory->term->create( array(
-			'name' => 'Bar',
-			'slug' => 'bar',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t3 = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'slug' => 'bar',
-		) );
-
-		$this->assertWPError( $t3 );
-		$this->assertSame( 'term_exists', $t3->get_error_code() );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_allow_duplicate_names_when_slug_is_a_duplicate_of_a_term_at_different_hierarchy_level_in_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = $this->factory->term->create();
-
-		$t3 = $this->factory->term->create( array(
-			'name' => 'Bar',
-			'slug' => 'bar',
-			'parent' => $t2,
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t4 = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'slug' => 'bar',
-		) );
-
-		$this->assertFalse( is_wp_error( $t4 ) );
-		$t4_term = get_term( $t4['term_id'], 'wptests_tax' );
-
-		// `wp_unique_term_slug()` allows term creation but iterates the slug.
-		$this->assertSame( 'bar-2', $t4_term->slug );
-		$this->assertSame( 'Foo', $t4_term->name );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_allow_duplicate_names_when_a_unique_slug_has_been_provided_in_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'slug' => 'foo-unique',
-		) );
-
-		$this->assertFalse( is_wp_error( $t2 ) );
-
-		$t2_term = get_term( $t2['term_id'], 'wptests_tax' );
-		$this->assertSame( 'foo-unique', $t2_term->slug );
-		$this->assertSame( 'Foo', $t2_term->name );
-	}
-
-	/**
-	 * @ticket 31328
-	 */
-	public function test_wp_insert_term_should_not_allow_duplicate_names_when_the_slug_is_not_provided_in_hierarchical_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax' );
-
-		$this->assertWPError( $t2 );
-		$this->assertSame( 'term_exists', $t2->get_error_code() );
-	}
-	/**
-	 * @ticket 5809
-	 */
-	public function test_wp_insert_term_duplicate_slug_same_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$term = get_term( $t, 'wptests_tax' );
-
-		$created = wp_insert_term( 'Foo 2', 'wptests_tax', array(
-			'slug' => 'foo',
-		) );
-
-		$created_term = get_term( $created['term_id'], 'wptests_tax' );
-		$this->assertSame( 'foo-2', $created_term->slug );
-
-		_unregister_taxonomy( 'wptests_tax', 'post' );
-	}
-
-	/**
-	 * @ticket 5809
-	 */
-	public function test_wp_insert_term_duplicate_slug_different_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		register_taxonomy( 'wptests_tax_2', 'post' );
-		$t = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$term = get_term( $t, 'wptests_tax' );
-
-		$created = wp_insert_term( 'Foo 2', 'wptests_tax_2', array(
-			'slug' => 'foo',
-		) );
-
-		$this->assertFalse( is_wp_error( $created ) );
-
-		$new_term = get_term( $created['term_id'], 'wptests_tax_2' );
-
-		$this->assertSame( 'foo', $new_term->slug );
-
-		_unregister_taxonomy( 'wptests_tax', 'post' );
-	}
-
-	/**
-	 * @ticket 5809
-	 */
-	public function test_wp_insert_term_duplicate_slug_different_taxonomy_before_410_schema_change() {
-
-		$db_version = get_option( 'db_version' );
-		update_option( 'db_version', 30055 );
-
-		register_taxonomy( 'wptests_tax', 'post' );
-		register_taxonomy( 'wptests_tax_2', 'post' );
-		$t = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$term = get_term( $t, 'wptests_tax' );
-
-		$created = wp_insert_term( 'Foo 2', 'wptests_tax_2', array(
-			'slug' => 'foo',
-		) );
-
-		$this->assertFalse( is_wp_error( $created ) );
-
-		$new_term = get_term( $created['term_id'], 'wptests_tax_2' );
-
-		/*
-		 * As of 4.1, we no longer create a shared term, but we also do not
-		 * allow for duplicate slugs.
-		 */
-		$this->assertSame( 'foo-2', $new_term->slug );
-		$this->assertNotEquals( $new_term->term_id, $term->term_id );
-
-		_unregister_taxonomy( 'wptests_tax', 'post' );
-		update_option( 'db_version', $db_version );
-	}
-
-	public function test_wp_insert_term_alias_of_no_term_group() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-		$term_1 = get_term( $t1, 'wptests_tax' );
-
-		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'alias_of' => $term_1->slug,
-		) );
-		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
-
-		$updated_term_1 = get_term( $term_1->term_id, 'wptests_tax' );
-
-		$term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 0, $term_1->term_group );
-		$this->assertNotEmpty( $created_term->term_group );
-		$this->assertSame( $created_term->term_group, $updated_term_1->term_group );
-	}
-
-	public function test_wp_insert_term_alias_of_existing_term_group() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-		$term_1 = get_term( $t1, 'wptests_tax' );
-
-		$t2 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'alias_of' => $term_1->slug,
-		) );
-		$term_2 = get_term( $t2, 'wptests_tax' );
-
-		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'alias_of' => $term_2->slug,
-		) );
-		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertNotEmpty( $created_term->term_group );
-		$this->assertSame( $created_term->term_group, $term_2->term_group );
-	}
-
-	public function test_wp_insert_term_alias_of_nonexistent_term() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax', array(
-			'alias_of' => 'foo',
-		) );
-		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 0, $created_term->term_group );
-	}
-
-	/**
-	 * @ticket 5809
-	 */
-	public function test_wp_insert_term_should_not_create_shared_term() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		register_taxonomy( 'wptests_tax_2', 'post' );
-
-		$t1 = wp_insert_term( 'Foo', 'wptests_tax' );
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax_2' );
-
-		$this->assertNotEquals( $t1['term_id'], $t2['term_id'] );
-	}
-
-	public function test_wp_insert_term_should_return_term_id_and_term_taxonomy_id() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$found = wp_insert_term( 'foo', 'wptests_tax' );
-
-		$term_by_id = get_term( $found['term_id'], 'wptests_tax' );
-		$term_by_slug = get_term_by( 'slug', 'foo', 'wptests_tax' );
-		$term_by_ttid = get_term_by( 'term_taxonomy_id', $found['term_taxonomy_id'], 'wptests_tax' );
-
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertInternalType( 'array', $found );
-		$this->assertNotEmpty( $found['term_id'] );
-		$this->assertNotEmpty( $found['term_taxonomy_id'] );
-		$this->assertNotEmpty( $term_by_id );
-		$this->assertEquals( $term_by_id, $term_by_slug );
-		$this->assertEquals( $term_by_id, $term_by_ttid );
-	}
-
-	public function test_wp_insert_term_should_clean_term_cache() {
-		register_taxonomy( 'wptests_tax', 'post', array(
-			'hierarchical' => true,
-		) );
-
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		/**
-		 * It doesn't appear that WordPress itself ever sets these
-		 * caches, but we should ensure that they're being cleared for
-		 * compatibility with third-party addons. Prime the caches
-		 * manually.
-		 */
-		wp_cache_set( 'all_ids', array( 1, 2, 3 ), 'wptests_tax' );
-		wp_cache_set( 'get', array( 1, 2, 3 ), 'wptests_tax' );
-
-		$found = wp_insert_term( 'foo', 'wptests_tax', array(
-			'parent' => $t,
-		) );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( false, wp_cache_get( 'all_ids', 'wptests_tax' ) );
-		$this->assertSame( false, wp_cache_get( 'get', 'wptests_tax' ) );
-
-		$cached_children = get_option( 'wptests_tax_children' );
-		$this->assertNotEmpty( $cached_children[ $t ] );
-		$this->assertTrue( in_array( $found['term_id'], $cached_children[ $t ] ) );
-	}
-
-	public function test_wp_update_term_taxonomy_does_not_exist() {
-		$found = wp_update_term( 1, 'bar' );
-
-		$this->assertTrue( is_wp_error( $found ) );
-		$this->assertSame( 'invalid_taxonomy', $found->get_error_code() );
-	}
-
-	public function test_wp_update_term_term_empty_string_should_return_wp_error() {
-		$found = wp_update_term( '', 'post_tag' );
-
-		$this->assertTrue( is_wp_error( $found ) );
-		$this->assertSame( 'invalid_term', $found->get_error_code() );
-	}
-
-	public function test_wp_update_term_unslash_name() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'name' => 'Let\\\'s all say \\"Hooray\\" for WordPress taxonomy',
-		) );
-
-		$term = get_term( $found['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 'Let\'s all say "Hooray" for WordPress taxonomy', $term->name );
-	}
-
-	public function test_wp_update_term_unslash_description() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'description' => 'Let\\\'s all say \\"Hooray\\" for WordPress taxonomy',
-		) );
-
-		$term = get_term( $found['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 'Let\'s all say "Hooray" for WordPress taxonomy', $term->description );
-	}
-
-	public function test_wp_update_term_name_empty_string() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'name' => '',
-		) );
-
-		$this->assertTrue( is_wp_error( $found ) );
-		$this->assertSame( 'empty_term_name', $found->get_error_code() );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	/**
-	 * @ticket 29614
-	 */
-	function test_wp_update_term_parent_does_not_exist() {
-		register_taxonomy( 'wptests_tax', array(
-			'hierarchical' => true,
-		) );
-		$fake_term_id = 787878;
-
-		$this->assertNull( term_exists( $fake_term_id, 'wptests_tax' ) );
-
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'parent' => $fake_term_id,
-		) );
-
-		$this->assertWPError( $found );
-		$this->assertSame( 'missing_parent', $found->get_error_code() );
-
-		$term = get_term( $t, 'wptests_tax' );
-		$this->assertEquals( 0, $term->parent );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	public function test_wp_update_term_slug_empty_string_while_not_updating_name() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'name' => 'Foo Bar',
-		) );
-
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'slug' => '',
-		) );
-
-		$term = get_term( $t, 'wptests_tax' );
-		$this->assertSame( 'foo-bar', $term->slug );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	public function test_wp_update_term_slug_empty_string_while_updating_name() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'name' => 'Foo Bar',
-			'slug' => '',
-		) );
-
-		$term = get_term( $t, 'wptests_tax' );
-		$this->assertSame( 'foo-bar', $term->slug );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	public function test_wp_update_term_slug_set_slug() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'slug' => 'foo-bar',
-		) );
-
-		$term = get_term( $t, 'wptests_tax' );
-		$this->assertSame( 'foo-bar', $term->slug );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	/**
-	 * @ticket 5809
-	 */
-	public function test_wp_update_term_should_not_create_duplicate_slugs_within_the_same_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post' );
-
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = $this->factory->term->create( array(
-			'name' => 'Bar',
-			'slug' => 'bar',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$updated = wp_update_term( $t2, 'wptests_tax', array(
-			'slug' => 'foo',
-		) );
-
-		$this->assertWPError( $updated );
-		$this->assertSame( 'duplicate_term_slug', $updated->get_error_code() );
-	}
-
-	/**
-	 * @ticket 5809
-	 */
-	public function test_wp_update_term_should_allow_duplicate_slugs_in_different_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		register_taxonomy( 'wptests_tax_2', 'post' );
-
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'bar',
-			'taxonomy' => 'wptests_tax_2',
-		) );
-
-		$updated = wp_update_term( $t2, 'wptests_tax_2', array(
-			'slug' => 'foo',
-		) );
-
-		$this->assertFalse( is_wp_error( $updated ) );
-
-		$t1_term = get_term( $t1, 'wptests_tax' );
-		$t2_term = get_term( $t2, 'wptests_tax_2' );
-		$this->assertSame( $t1_term->slug, $t2_term->slug );
-	}
-
-	/**
-	 * @ticket 30780
-	 */
-	public function test_wp_update_term_should_allow_duplicate_names_in_different_taxonomies() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		register_taxonomy( 'wptests_tax_2', 'post' );
-
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = $this->factory->term->create( array(
-			'name' => 'Bar',
-			'slug' => 'bar',
-			'taxonomy' => 'wptests_tax_2',
-		) );
-
-		$updated = wp_update_term( $t2, 'wptests_tax_2', array(
-			'name' => 'Foo',
-		) );
-
-		$this->assertFalse( is_wp_error( $updated ) );
-
-		$t2_term = get_term( $t2, 'wptests_tax_2' );
-		$this->assertSame( 'Foo', $t2_term->name );
-	}
-
-	/**
-	 * @ticket 30780
-	 */
-	public function test_wp_update_term_should_allow_duplicate_names_at_different_levels_of_the_same_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post', array(
-			'hierarchical' => true,
-		) );
-
-		$t1 = $this->factory->term->create( array(
-			'name' => 'Foo',
-			'slug' => 'foo',
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$t2 = $this->factory->term->create( array(
-			'name' => 'Bar',
-			'slug' => 'bar',
-			'taxonomy' => 'wptests_tax',
-			'parent' => $t1,
-		) );
-
-		$t3 = $this->factory->term->create( array(
-			'name' => 'Bar Child',
-			'slug' => 'bar-child',
-			'taxonomy' => 'wptests_tax',
-			'parent' => $t2,
-		) );
-
-		$updated = wp_update_term( $t3, 'wptests_tax', array(
-			'name' => 'Bar',
-		) );
-
-		$this->assertFalse( is_wp_error( $updated ) );
-
-		$t3_term = get_term( $t3, 'wptests_tax' );
-		$this->assertSame( 'Bar', $t3_term->name );
-	}
-
-	/**
-	 * @ticket 5809
-	 */
-	public function test_wp_update_term_should_split_shared_term() {
-		global $wpdb;
-
-		register_taxonomy( 'wptests_tax', 'post' );
-		register_taxonomy( 'wptests_tax_2', 'post' );
-
-		$t1 = wp_insert_term( 'Foo', 'wptests_tax' );
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax_2' );
-
-		// Manually modify because split terms shouldn't naturally occur.
-		$wpdb->update( $wpdb->term_taxonomy,
-			array( 'term_id' => $t1['term_id'] ),
-			array( 'term_taxonomy_id' => $t2['term_taxonomy_id'] ),
-			array( '%d' ),
-			array( '%d' )
-		);
-
-		$posts = $this->factory->post->create_many( 2 );
-		wp_set_object_terms( $posts[0], array( 'Foo' ), 'wptests_tax' );
-		wp_set_object_terms( $posts[1], array( 'Foo' ), 'wptests_tax_2' );
-
-		// Verify that the terms are shared.
-		$t1_terms = wp_get_object_terms( $posts[0], 'wptests_tax' );
-		$t2_terms = wp_get_object_terms( $posts[1], 'wptests_tax_2' );
-		$this->assertSame( $t1_terms[0]->term_id, $t2_terms[0]->term_id );
-
-		wp_update_term( $t2_terms[0]->term_id, 'wptests_tax_2', array(
-			'name' => 'New Foo',
-		) );
-
-		$t1_terms = wp_get_object_terms( $posts[0], 'wptests_tax' );
-		$t2_terms = wp_get_object_terms( $posts[1], 'wptests_tax_2' );
-		$this->assertNotEquals( $t1_terms[0]->term_id, $t2_terms[0]->term_id );
-	}
-
-	/**
-	 * @ticket 5809
-	 */
-	public function test_wp_update_term_should_not_split_shared_term_before_410_schema_change() {
-		global $wpdb;
-
-		$db_version = get_option( 'db_version' );
-		update_option( 'db_version', 30055 );
-
-		register_taxonomy( 'wptests_tax', 'post' );
-		register_taxonomy( 'wptests_tax_2', 'post' );
-
-		$t1 = wp_insert_term( 'Foo', 'wptests_tax' );
-		$t2 = wp_insert_term( 'Foo', 'wptests_tax_2' );
-
-		// Manually modify because split terms shouldn't naturally occur.
-		$wpdb->update( $wpdb->term_taxonomy,
-			array( 'term_id' => $t1['term_id'] ),
-			array( 'term_taxonomy_id' => $t2['term_taxonomy_id'] ),
-			array( '%d' ),
-			array( '%d' )
-		);
-
-		$posts = $this->factory->post->create_many( 2 );
-		wp_set_object_terms( $posts[0], array( 'Foo' ), 'wptests_tax' );
-		wp_set_object_terms( $posts[1], array( 'Foo' ), 'wptests_tax_2' );
-
-		// Verify that the term is shared.
-		$t1_terms = wp_get_object_terms( $posts[0], 'wptests_tax' );
-		$t2_terms = wp_get_object_terms( $posts[1], 'wptests_tax_2' );
-		$this->assertSame( $t1_terms[0]->term_id, $t2_terms[0]->term_id );
-
-		wp_update_term( $t2_terms[0]->term_id, 'wptests_tax_2', array(
-			'name' => 'New Foo',
-		) );
-
-		// Term should still be shared.
-		$t1_terms = wp_get_object_terms( $posts[0], 'wptests_tax' );
-		$t2_terms = wp_get_object_terms( $posts[1], 'wptests_tax_2' );
-		$this->assertSame( $t1_terms[0]->term_id, $t2_terms[0]->term_id );
-
-		update_option( 'db_version', $db_version );
-	}
-
-	public function test_wp_update_term_alias_of_no_term_group() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-		$term_1 = get_term( $t1, 'wptests_tax' );
-
-		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax' );
-		wp_update_term( $created_term_ids['term_id'], 'wptests_tax', array(
-			'alias_of' => $term_1->slug,
-		) );
-		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
-
-		$updated_term_1 = get_term( $t1, 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 0, $term_1->term_group );
-		$this->assertNotEmpty( $created_term->term_group );
-		$this->assertSame( $created_term->term_group, $updated_term_1->term_group );
-	}
-
-	public function test_wp_update_term_alias_of_existing_term_group() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-		$term_1 = get_term( $t1, 'wptests_tax' );
-
-		$t2 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'alias_of' => $term_1->slug,
-		) );
-		$term_2 = get_term( $t2, 'wptests_tax' );
-
-		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax' );
-		wp_update_term( $created_term_ids['term_id'], 'wptests_tax', array(
-			'alias_of' => $term_2->slug,
-		) );
-		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertNotEmpty( $created_term->term_group );
-		$this->assertSame( $created_term->term_group, $term_2->term_group );
-	}
-
-	public function test_wp_update_term_alias_of_nonexistent_term() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax' );
-		wp_update_term( $created_term_ids['term_id'], 'wptests_tax', array(
-			'alias_of' => 'bar',
-		) );
-		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( 0, $created_term->term_group );
-	}
-
-	public function test_wp_update_term_slug_same_as_old_slug() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'foo',
-		) );
-
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'slug' => 'foo',
-		) );
-
-		$term = get_term( $t, 'wptests_tax' );
-
-		$this->assertSame( $t, $found['term_id'] );
-		$this->assertSame( 'foo', $term->slug );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	public function test_wp_update_term_duplicate_slug_generated_due_to_empty_slug_param() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'foo-bar',
-		) );
-		$t2 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'name' => 'not foo bar',
-		) );
-
-		$found = wp_update_term( $t2, 'wptests_tax', array(
-			'slug' => '',
-			'name' => 'Foo? Bar!', // Will sanitize to 'foo-bar'.
-		) );
-
-		$term = get_term( $t2, 'wptests_tax' );
-
-		$this->assertSame( $t2, $found['term_id'] );
-		$this->assertSame( 'foo-bar-2', $term->slug );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	public function test_wp_update_term_duplicate_slug_with_changed_parent() {
-		register_taxonomy( 'wptests_tax', 'post', array(
-			'hierarchical' => true,
-		) );
-		$p = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'foo-bar',
-		) );
-		$t2 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		$found = wp_update_term( $t2, 'wptests_tax', array(
-			'parent' => $p,
-			'slug' => 'foo-bar',
-		) );
-
-		$term = get_term( $t2, 'wptests_tax' );
-		$parent_term = get_term( $p, 'wptests_tax' );
-
-		$this->assertSame( $t2, $found['term_id'] );
-		$this->assertSame( 'foo-bar-' . $parent_term->slug, $term->slug );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	public function test_wp_update_term_duplicate_slug_failure() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'foo-bar',
-		) );
-		$t2 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'my-old-slug',
-		) );
-
-		$found = wp_update_term( $t2, 'wptests_tax', array(
-			'slug' => 'foo-bar',
-		) );
-
-		$term = get_term( $t2, 'wptests_tax' );
-
-		$this->assertWPError( $found );
-		$this->assertSame( 'duplicate_term_slug', $found->get_error_code() );
-		$this->assertSame( 'my-old-slug', $term->slug );
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	public function test_wp_update_term_should_return_term_id_and_term_taxonomy_id() {
-		register_taxonomy( 'wptests_tax', 'post' );
-		$t = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-		$found = wp_update_term( $t, 'wptests_tax', array(
-			'slug' => 'foo',
-		) );
-
-		$term_by_id = get_term( $found['term_id'], 'wptests_tax' );
-		$term_by_slug = get_term_by( 'slug', 'foo', 'wptests_tax' );
-		$term_by_ttid = get_term_by( 'term_taxonomy_id', $found['term_taxonomy_id'], 'wptests_tax' );
-
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertInternalType( 'array', $found );
-		$this->assertNotEmpty( $found['term_id'] );
-		$this->assertNotEmpty( $found['term_taxonomy_id'] );
-		$this->assertNotEmpty( $term_by_id );
-		$this->assertEquals( $term_by_id, $term_by_slug );
-		$this->assertEquals( $term_by_id, $term_by_ttid );
-	}
-
-	public function test_wp_update_term_should_clean_object_term_cache() {
-		register_taxonomy( 'wptests_tax_for_post', 'post' );
-		register_taxonomy( 'wptests_tax_for_page', 'page' );
-		$post = $this->factory->post->create();
-		$page = $this->factory->post->create( array(
-			'post_type' => 'page',
-		) );
-
-		$t_for_post = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax_for_post',
-		) );
-		$t_for_page = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax_for_page',
-		) );
-
-		wp_set_post_terms( $post, array( $t_for_post ), 'wptests_tax_for_post' );
-		wp_set_post_terms( $page, array( $t_for_page ), 'wptests_tax_for_page' );
-
-		// Prime caches and verify.
-		update_object_term_cache( array( $post ), 'post' );
-		update_object_term_cache( array( $page ), 'page' );
-		$this->assertNotEmpty( wp_cache_get( $post, 'wptests_tax_for_post_relationships' ) );
-		$this->assertNotEmpty( wp_cache_get( $page, 'wptests_tax_for_page_relationships' ) );
-
-		// Update a term in just one of the taxonomies.
-		$found = wp_update_term( $t_for_post, 'wptests_tax_for_post', array(
-			'slug' => 'foo',
-		) );
-
-		// Only the relevant cache should have been cleared.
-		$this->assertFalse( wp_cache_get( $post, 'wptests_tax_for_post_relationships' ) );
-		$this->assertNotEmpty( wp_cache_get( $page, 'wptests_tax_for_page_relationships' ) );
-	}
-
-	public function test_wp_update_term_should_clean_term_cache() {
-		register_taxonomy( 'wptests_tax', 'post', array(
-			'hierarchical' => true,
-		) );
-
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-		$t2 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-		) );
-
-		/*
-		 * It doesn't appear that WordPress itself ever sets these
-		 * caches, but we should ensure that they're being cleared for
-		 * compatibility with third-party addons. Prime the caches
-		 * manually.
-		 */
-		wp_cache_set( 'all_ids', array( 1, 2, 3 ), 'wptests_tax' );
-		wp_cache_set( 'get', array( 1, 2, 3 ), 'wptests_tax' );
-
-		$found = wp_update_term( $t1, 'wptests_tax', array(
-			'parent' => $t2,
-		) );
-		_unregister_taxonomy( 'wptests_tax' );
-
-		$this->assertSame( false, wp_cache_get( 'all_ids', 'wptests_tax' ) );
-		$this->assertSame( false, wp_cache_get( 'get', 'wptests_tax' ) );
-
-		$cached_children = get_option( 'wptests_tax_children' );
-		$this->assertNotEmpty( $cached_children[ $t2 ] );
-		$this->assertTrue( in_array( $found['term_id'], $cached_children[ $t2 ] ) );
-	}
-
 	/**
 	 * @ticket 29911
 	 */
@@ -1831,80 +630,4 @@ class Tests_Term extends WP_UnitTestCase {
 		$cat_id2 = $this->factory->category->create( array( 'parent' => $cat_id1 ) );
 		$this->assertWPError( $cat_id2 );
 	}
-
-	/**
-	 * @ticket 30780
-	 */
-	public function test_wp_update_term_should_assign_new_slug_when_reassigning_parent_as_long_as_there_is_no_other_term_with_the_same_slug() {
-		register_taxonomy( 'wptests_tax', 'post', array(
-			'hierarchical' => true,
-		) );
-		register_taxonomy( 'wptests_tax_2', 'post', array(
-			'hierarchical' => true,
-		) );
-
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'parent-term',
-		) );
-
-		$t2 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'foo',
-		) );
-
-		wp_update_term( $t2, 'wptests_tax', array(
-			'parent' => $t1,
-		) );
-
-		$t2_term = get_term( $t2, 'wptests_tax' );
-
-		$this->assertSame( 'foo', $t2_term->slug );
-
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	/**
-	 * @ticket 30780
-	 */
-	public function test_wp_update_term_should_not_assign_new_slug_when_reassigning_parent_as_long_as_there_is_no_other_slug_conflict_within_the_taxonomy() {
-		register_taxonomy( 'wptests_tax', 'post', array(
-			'hierarchical' => true,
-		) );
-		register_taxonomy( 'wptests_tax_2', 'post', array(
-			'hierarchical' => true,
-		) );
-
-		$t1 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'parent-term',
-		) );
-
-		// Same slug but in a different tax.
-		$t2 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax_2',
-			'slug' => 'foo',
-		) );
-
-		$t3 = $this->factory->term->create( array(
-			'taxonomy' => 'wptests_tax',
-			'slug' => 'foo',
-		) );
-
-		wp_update_term( $t3, 'wptests_tax', array(
-			'parent' => $t1,
-		) );
-
-		$t3_term = get_term( $t3, 'wptests_tax' );
-
-		$this->assertSame( 'foo', $t3_term->slug );
-
-		_unregister_taxonomy( 'wptests_tax' );
-	}
-
-	/** Helpers **********************************************************/
-
-	public function _pre_insert_term_callback() {
-		return new WP_Error( 'custom_error' );
-	}
 }
diff --git a/tests/phpunit/tests/term/wpInsertTerm.php b/tests/phpunit/tests/term/wpInsertTerm.php
new file mode 100644
index 0000000000..3cac325d0e
--- /dev/null
+++ b/tests/phpunit/tests/term/wpInsertTerm.php
@@ -0,0 +1,636 @@
+<?php
+
+/**
+ * @group taxonomy
+ */
+class Tests_Term_WpInsertTerm extends WP_UnitTestCase {
+	public function setUp() {
+		parent::setUp();
+
+		_clean_term_filters();
+		// insert one term into every post taxonomy
+		// otherwise term_ids and term_taxonomy_ids might be identical, which could mask bugs
+		$term = rand_str();
+		foreach(get_object_taxonomies('post') as $tax)
+			wp_insert_term( $term, $tax );
+	}
+
+	public function test_wp_insert_delete_term() {
+		$taxonomy = 'wptests_tax';
+		register_taxonomy( $taxonomy, 'post' );
+
+		// a new unused term
+		$term = rand_str();
+		$this->assertNull( term_exists($term) );
+
+		$initial_count = wp_count_terms( $taxonomy );
+
+		$t = wp_insert_term( $term, $taxonomy );
+		$this->assertInternalType( 'array', $t );
+		$this->assertFalse( is_wp_error($t) );
+		$this->assertTrue( $t['term_id'] > 0 );
+		$this->assertTrue( $t['term_taxonomy_id'] > 0 );
+		$this->assertEquals( $initial_count + 1, wp_count_terms( $taxonomy ) );
+
+		// make sure the term exists
+		$this->assertTrue( term_exists($term) > 0 );
+		$this->assertTrue( term_exists($t['term_id']) > 0 );
+
+		// now delete it
+		add_filter( 'delete_term', array( $this, 'deleted_term_cb' ), 10, 4 );
+		$this->assertTrue( wp_delete_term( $t['term_id'], $taxonomy ) );
+		remove_filter( 'delete_term', array( $this, 'deleted_term_cb' ), 10, 4 );
+		$this->assertNull( term_exists($term) );
+		$this->assertNull( term_exists($t['term_id']) );
+		$this->assertEquals( $initial_count, wp_count_terms( $taxonomy ) );
+	}
+
+	public function test_wp_insert_term_taxonomy_does_not_exist() {
+		$found = wp_insert_term( 'foo', 'bar' );
+
+		$this->assertTrue( is_wp_error( $found ) );
+		$this->assertSame( 'invalid_taxonomy', $found->get_error_code() );
+	}
+
+	public function test_wp_insert_term_pre_insert_term_filter_returns_wp_error() {
+		add_filter( 'pre_insert_term', array( $this, '_pre_insert_term_callback' ) );
+		$found = wp_insert_term( 'foo', 'post_tag' );
+		remove_filter( 'pre_insert_term', array( $this, '_pre_insert_term_callback' ) );
+
+		$this->assertTrue( is_wp_error( $found ) );
+		$this->assertSame( 'custom_error', $found->get_error_code() );
+	}
+
+	public function test_wp_insert_term_term_0() {
+		$found = wp_insert_term( 0, 'post_tag' );
+
+		$this->assertTrue( is_wp_error( $found ) );
+		$this->assertSame( 'invalid_term_id', $found->get_error_code() );
+	}
+
+	public function test_wp_insert_term_term_trims_to_empty_string() {
+		$found = wp_insert_term( '  ', 'post_tag' );
+
+		$this->assertTrue( is_wp_error( $found ) );
+		$this->assertSame( 'empty_term_name', $found->get_error_code() );
+	}
+
+	public function test_wp_insert_term_parent_does_not_exist() {
+		$found = wp_insert_term( 'foo', 'post_tag', array(
+			'parent' => 999999,
+		) );
+
+		$this->assertTrue( is_wp_error( $found ) );
+		$this->assertSame( 'missing_parent', $found->get_error_code() );
+	}
+
+	public function test_wp_insert_term_unslash_name() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$found = wp_insert_term( 'Let\\\'s all say \\"Hooray\\" for WordPress taxonomy', 'wptests_tax' );
+
+		$term = get_term( $found['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 'Let\'s all say "Hooray" for WordPress taxonomy', $term->name );
+	}
+
+	public function test_wp_insert_term_unslash_description() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
+			'description' => 'Let\\\'s all say \\"Hooray\\" for WordPress taxonomy',
+		) );
+
+		$term = get_term( $found['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 'Let\'s all say "Hooray" for WordPress taxonomy', $term->description );
+	}
+
+	public function test_wp_insert_term_parent_string() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
+			'parent' => 'foo1',
+		) );
+
+		$term = get_term( $found['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		// 'foo1' is cast to 0 in sanitize_term().
+		$this->assertSame( 0, $term->parent );
+	}
+
+	public function test_wp_insert_term_slug_empty_string() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
+			'slug' => '',
+		) );
+
+		$term = get_term( $found['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 'quality', $term->slug );
+
+	}
+
+	public function test_wp_insert_term_slug_whitespace_string() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
+			'slug' => '  ',
+		) );
+
+		$term = get_term( $found['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 'quality', $term->slug );
+	}
+
+	public function test_wp_insert_term_slug_0() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$found = wp_insert_term( 'Quality', 'wptests_tax', array(
+			'slug' => 0,
+		) );
+
+		$term = get_term( $found['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 'quality', $term->slug );
+	}
+
+	/**
+	 * @ticket 17689
+	 */
+	public function test_wp_insert_term_duplicate_name() {
+		$term = $this->factory->tag->create_and_get( array( 'name' => 'Bozo' ) );
+		$this->assertFalse( is_wp_error( $term ) );
+		$this->assertTrue( empty( $term->errors ) );
+
+		// Test existing term name with unique slug
+		$term1 = $this->factory->tag->create( array( 'name' => 'Bozo', 'slug' => 'bozo1' ) );
+		$this->assertFalse( is_wp_error( $term1 ) );
+
+		// Test an existing term name
+		$term2 = $this->factory->tag->create( array( 'name' => 'Bozo' ) );
+		$this->assertTrue( is_wp_error( $term2 ) );
+		$this->assertNotEmpty( $term2->errors );
+
+		// Test named terms ending in special characters
+		$term3 = $this->factory->tag->create( array( 'name' => 'T$' ) );
+		$term4 = $this->factory->tag->create( array( 'name' => 'T$$' ) );
+		$term5 = $this->factory->tag->create( array( 'name' => 'T$$$' ) );
+		$term6 = $this->factory->tag->create( array( 'name' => 'T$$$$' ) );
+		$term7 = $this->factory->tag->create( array( 'name' => 'T$$$$' ) );
+		$this->assertTrue( is_wp_error( $term7 ) );
+		$this->assertNotEmpty( $term7->errors );
+		$this->assertEquals( $term6, $term7->error_data['term_exists'] );
+
+		$terms = array_map( 'get_tag', array( $term3, $term4, $term5, $term6 ) );
+		$this->assertCount( 4, array_unique( wp_list_pluck( $terms, 'slug' ) ) );
+
+		// Test named terms with only special characters
+		$term8 = $this->factory->tag->create( array( 'name' => '$' ) );
+		$term9 = $this->factory->tag->create( array( 'name' => '$$' ) );
+		$term10 = $this->factory->tag->create( array( 'name' => '$$$' ) );
+		$term11 = $this->factory->tag->create( array( 'name' => '$$$$' ) );
+		$term12 = $this->factory->tag->create( array( 'name' => '$$$$' ) );
+		$this->assertTrue( is_wp_error( $term12 ) );
+		$this->assertNotEmpty( $term12->errors );
+		$this->assertEquals( $term11, $term12->error_data['term_exists'] );
+
+		$terms = array_map( 'get_tag', array( $term8, $term9, $term10, $term11 ) );
+		$this->assertCount( 4, array_unique( wp_list_pluck( $terms, 'slug' ) ) );
+
+		$term13 = $this->factory->tag->create( array( 'name' => 'A' ) );
+		$this->assertFalse( is_wp_error( $term13 ) );
+		$term14 = $this->factory->tag->create( array( 'name' => 'A' ) );
+		$this->assertTrue( is_wp_error( $term14 ) );
+		$term15 = $this->factory->tag->create( array( 'name' => 'A+', 'slug' => 'a' ) );
+		$this->assertFalse( is_wp_error( $term15 ) );
+		$term16 = $this->factory->tag->create( array( 'name' => 'A+' ) );
+		$this->assertTrue( is_wp_error( $term16 ) );
+		$term17 = $this->factory->tag->create( array( 'name' => 'A++' ) );
+		$this->assertFalse( is_wp_error( $term17 ) );
+		$term18 = $this->factory->tag->create( array( 'name' => 'A-', 'slug' => 'a' ) );
+		$this->assertFalse( is_wp_error( $term18 ) );
+		$term19 = $this->factory->tag->create( array( 'name' => 'A-' ) );
+		$this->assertTrue( is_wp_error( $term19 ) );
+		$term20 = $this->factory->tag->create( array( 'name' => 'A--' ) );
+		$this->assertFalse( is_wp_error( $term20 ) );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_not_allow_duplicate_names_when_slug_is_a_duplicate_of_the_same_term_in_non_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'slug' => 'foo',
+		) );
+
+		$this->assertWPError( $t2 );
+		$this->assertSame( 'term_exists', $t2->get_error_code() );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_not_allow_duplicate_names_when_slug_is_a_duplicate_of_a_different_term_in_non_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = $this->factory->term->create( array(
+			'name' => 'Bar',
+			'slug' => 'bar',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t3 = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'slug' => 'bar',
+		) );
+
+		$this->assertWPError( $t3 );
+		$this->assertSame( 'term_exists', $t3->get_error_code() );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_allow_duplicate_names_when_a_unique_slug_has_been_provided_in_non_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'slug' => 'foo-unique',
+		) );
+
+		$this->assertFalse( is_wp_error( $t2 ) );
+
+		$t2_term = get_term( $t2['term_id'], 'wptests_tax' );
+		$this->assertSame( 'foo-unique', $t2_term->slug );
+		$this->assertSame( 'Foo', $t2_term->name );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_not_allow_duplicate_names_when_the_slug_is_not_provided_in_non_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax' );
+
+		$this->assertWPError( $t2 );
+		$this->assertSame( 'term_exists', $t2->get_error_code() );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_not_allow_duplicate_names_when_slug_is_a_duplicate_of_the_same_term_in_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'slug' => 'foo',
+		) );
+
+		$this->assertWPError( $t2 );
+		$this->assertSame( 'term_exists', $t2->get_error_code() );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_not_allow_duplicate_names_when_slug_is_a_duplicate_of_a_different_term_at_same_hierarchy_level_in_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = $this->factory->term->create( array(
+			'name' => 'Bar',
+			'slug' => 'bar',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t3 = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'slug' => 'bar',
+		) );
+
+		$this->assertWPError( $t3 );
+		$this->assertSame( 'term_exists', $t3->get_error_code() );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_allow_duplicate_names_when_slug_is_a_duplicate_of_a_term_at_different_hierarchy_level_in_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = $this->factory->term->create();
+
+		$t3 = $this->factory->term->create( array(
+			'name' => 'Bar',
+			'slug' => 'bar',
+			'parent' => $t2,
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t4 = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'slug' => 'bar',
+		) );
+
+		$this->assertFalse( is_wp_error( $t4 ) );
+		$t4_term = get_term( $t4['term_id'], 'wptests_tax' );
+
+		// `wp_unique_term_slug()` allows term creation but iterates the slug.
+		$this->assertSame( 'bar-2', $t4_term->slug );
+		$this->assertSame( 'Foo', $t4_term->name );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_allow_duplicate_names_when_a_unique_slug_has_been_provided_in_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'slug' => 'foo-unique',
+		) );
+
+		$this->assertFalse( is_wp_error( $t2 ) );
+
+		$t2_term = get_term( $t2['term_id'], 'wptests_tax' );
+		$this->assertSame( 'foo-unique', $t2_term->slug );
+		$this->assertSame( 'Foo', $t2_term->name );
+	}
+
+	/**
+	 * @ticket 31328
+	 */
+	public function test_wp_insert_term_should_not_allow_duplicate_names_when_the_slug_is_not_provided_in_hierarchical_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax' );
+
+		$this->assertWPError( $t2 );
+		$this->assertSame( 'term_exists', $t2->get_error_code() );
+	}
+	/**
+	 * @ticket 5809
+	 */
+	public function test_wp_insert_term_duplicate_slug_same_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$term = get_term( $t, 'wptests_tax' );
+
+		$created = wp_insert_term( 'Foo 2', 'wptests_tax', array(
+			'slug' => 'foo',
+		) );
+
+		$created_term = get_term( $created['term_id'], 'wptests_tax' );
+		$this->assertSame( 'foo-2', $created_term->slug );
+
+		_unregister_taxonomy( 'wptests_tax', 'post' );
+	}
+
+	/**
+	 * @ticket 5809
+	 */
+	public function test_wp_insert_term_duplicate_slug_different_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		register_taxonomy( 'wptests_tax_2', 'post' );
+		$t = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$term = get_term( $t, 'wptests_tax' );
+
+		$created = wp_insert_term( 'Foo 2', 'wptests_tax_2', array(
+			'slug' => 'foo',
+		) );
+
+		$this->assertFalse( is_wp_error( $created ) );
+
+		$new_term = get_term( $created['term_id'], 'wptests_tax_2' );
+
+		$this->assertSame( 'foo', $new_term->slug );
+
+		_unregister_taxonomy( 'wptests_tax', 'post' );
+	}
+
+	/**
+	 * @ticket 5809
+	 */
+	public function test_wp_insert_term_duplicate_slug_different_taxonomy_before_410_schema_change() {
+
+		$db_version = get_option( 'db_version' );
+		update_option( 'db_version', 30055 );
+
+		register_taxonomy( 'wptests_tax', 'post' );
+		register_taxonomy( 'wptests_tax_2', 'post' );
+		$t = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$term = get_term( $t, 'wptests_tax' );
+
+		$created = wp_insert_term( 'Foo 2', 'wptests_tax_2', array(
+			'slug' => 'foo',
+		) );
+
+		$this->assertFalse( is_wp_error( $created ) );
+
+		$new_term = get_term( $created['term_id'], 'wptests_tax_2' );
+
+		/*
+		 * As of 4.1, we no longer create a shared term, but we also do not
+		 * allow for duplicate slugs.
+		 */
+		$this->assertSame( 'foo-2', $new_term->slug );
+		$this->assertNotEquals( $new_term->term_id, $term->term_id );
+
+		_unregister_taxonomy( 'wptests_tax', 'post' );
+		update_option( 'db_version', $db_version );
+	}
+
+	public function test_wp_insert_term_alias_of_no_term_group() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+		$term_1 = get_term( $t1, 'wptests_tax' );
+
+		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'alias_of' => $term_1->slug,
+		) );
+		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
+
+		$updated_term_1 = get_term( $term_1->term_id, 'wptests_tax' );
+
+		$term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 0, $term_1->term_group );
+		$this->assertNotEmpty( $created_term->term_group );
+		$this->assertSame( $created_term->term_group, $updated_term_1->term_group );
+	}
+
+	public function test_wp_insert_term_alias_of_existing_term_group() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+		$term_1 = get_term( $t1, 'wptests_tax' );
+
+		$t2 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'alias_of' => $term_1->slug,
+		) );
+		$term_2 = get_term( $t2, 'wptests_tax' );
+
+		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'alias_of' => $term_2->slug,
+		) );
+		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertNotEmpty( $created_term->term_group );
+		$this->assertSame( $created_term->term_group, $term_2->term_group );
+	}
+
+	public function test_wp_insert_term_alias_of_nonexistent_term() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax', array(
+			'alias_of' => 'foo',
+		) );
+		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 0, $created_term->term_group );
+	}
+
+	/**
+	 * @ticket 5809
+	 */
+	public function test_wp_insert_term_should_not_create_shared_term() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		register_taxonomy( 'wptests_tax_2', 'post' );
+
+		$t1 = wp_insert_term( 'Foo', 'wptests_tax' );
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax_2' );
+
+		$this->assertNotEquals( $t1['term_id'], $t2['term_id'] );
+	}
+
+	public function test_wp_insert_term_should_return_term_id_and_term_taxonomy_id() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$found = wp_insert_term( 'foo', 'wptests_tax' );
+
+		$term_by_id = get_term( $found['term_id'], 'wptests_tax' );
+		$term_by_slug = get_term_by( 'slug', 'foo', 'wptests_tax' );
+		$term_by_ttid = get_term_by( 'term_taxonomy_id', $found['term_taxonomy_id'], 'wptests_tax' );
+
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertInternalType( 'array', $found );
+		$this->assertNotEmpty( $found['term_id'] );
+		$this->assertNotEmpty( $found['term_taxonomy_id'] );
+		$this->assertNotEmpty( $term_by_id );
+		$this->assertEquals( $term_by_id, $term_by_slug );
+		$this->assertEquals( $term_by_id, $term_by_ttid );
+	}
+
+	public function test_wp_insert_term_should_clean_term_cache() {
+		register_taxonomy( 'wptests_tax', 'post', array(
+			'hierarchical' => true,
+		) );
+
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		/**
+		 * It doesn't appear that WordPress itself ever sets these
+		 * caches, but we should ensure that they're being cleared for
+		 * compatibility with third-party addons. Prime the caches
+		 * manually.
+		 */
+		wp_cache_set( 'all_ids', array( 1, 2, 3 ), 'wptests_tax' );
+		wp_cache_set( 'get', array( 1, 2, 3 ), 'wptests_tax' );
+
+		$found = wp_insert_term( 'foo', 'wptests_tax', array(
+			'parent' => $t,
+		) );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( false, wp_cache_get( 'all_ids', 'wptests_tax' ) );
+		$this->assertSame( false, wp_cache_get( 'get', 'wptests_tax' ) );
+
+		$cached_children = get_option( 'wptests_tax_children' );
+		$this->assertNotEmpty( $cached_children[ $t ] );
+		$this->assertTrue( in_array( $found['term_id'], $cached_children[ $t ] ) );
+	}
+
+	/** Helpers **********************************************************/
+
+	public function deleted_term_cb( $term, $tt_id, $taxonomy, $deleted_term ) {
+		$this->assertInternalType( 'object', $deleted_term );
+		$this->assertInternalType( 'int', $term );
+		// Pesky string $this->assertInternalType( 'int', $tt_id );
+		$this->assertEquals( $term, $deleted_term->term_id );
+		$this->assertEquals( $taxonomy, $deleted_term->taxonomy );
+		$this->assertEquals( $tt_id, $deleted_term->term_taxonomy_id );
+	}
+
+	public function _pre_insert_term_callback() {
+		return new WP_Error( 'custom_error' );
+	}
+}
diff --git a/tests/phpunit/tests/term/wpUpdateTerm.php b/tests/phpunit/tests/term/wpUpdateTerm.php
new file mode 100644
index 0000000000..33d579b89c
--- /dev/null
+++ b/tests/phpunit/tests/term/wpUpdateTerm.php
@@ -0,0 +1,656 @@
+<?php
+
+/**
+ * @group taxonomy
+ */
+class Tests_Term_WpUpdateTerm extends WP_UnitTestCase {
+	public function test_wp_update_term_taxonomy_does_not_exist() {
+		$found = wp_update_term( 1, 'bar' );
+
+		$this->assertTrue( is_wp_error( $found ) );
+		$this->assertSame( 'invalid_taxonomy', $found->get_error_code() );
+	}
+
+	public function test_wp_update_term_term_empty_string_should_return_wp_error() {
+		$found = wp_update_term( '', 'post_tag' );
+
+		$this->assertTrue( is_wp_error( $found ) );
+		$this->assertSame( 'invalid_term', $found->get_error_code() );
+	}
+
+	public function test_wp_update_term_unslash_name() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'name' => 'Let\\\'s all say \\"Hooray\\" for WordPress taxonomy',
+		) );
+
+		$term = get_term( $found['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 'Let\'s all say "Hooray" for WordPress taxonomy', $term->name );
+	}
+
+	public function test_wp_update_term_unslash_description() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'description' => 'Let\\\'s all say \\"Hooray\\" for WordPress taxonomy',
+		) );
+
+		$term = get_term( $found['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 'Let\'s all say "Hooray" for WordPress taxonomy', $term->description );
+	}
+
+	public function test_wp_update_term_name_empty_string() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'name' => '',
+		) );
+
+		$this->assertTrue( is_wp_error( $found ) );
+		$this->assertSame( 'empty_term_name', $found->get_error_code() );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	/**
+	 * @ticket 29614
+	 */
+	function test_wp_update_term_parent_does_not_exist() {
+		register_taxonomy( 'wptests_tax', array(
+			'hierarchical' => true,
+		) );
+		$fake_term_id = 787878;
+
+		$this->assertNull( term_exists( $fake_term_id, 'wptests_tax' ) );
+
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'parent' => $fake_term_id,
+		) );
+
+		$this->assertWPError( $found );
+		$this->assertSame( 'missing_parent', $found->get_error_code() );
+
+		$term = get_term( $t, 'wptests_tax' );
+		$this->assertEquals( 0, $term->parent );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	public function test_wp_update_term_slug_empty_string_while_not_updating_name() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'name' => 'Foo Bar',
+		) );
+
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'slug' => '',
+		) );
+
+		$term = get_term( $t, 'wptests_tax' );
+		$this->assertSame( 'foo-bar', $term->slug );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	public function test_wp_update_term_slug_empty_string_while_updating_name() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'name' => 'Foo Bar',
+			'slug' => '',
+		) );
+
+		$term = get_term( $t, 'wptests_tax' );
+		$this->assertSame( 'foo-bar', $term->slug );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	public function test_wp_update_term_slug_set_slug() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'slug' => 'foo-bar',
+		) );
+
+		$term = get_term( $t, 'wptests_tax' );
+		$this->assertSame( 'foo-bar', $term->slug );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	/**
+	 * @ticket 5809
+	 */
+	public function test_wp_update_term_should_not_create_duplicate_slugs_within_the_same_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post' );
+
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = $this->factory->term->create( array(
+			'name' => 'Bar',
+			'slug' => 'bar',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$updated = wp_update_term( $t2, 'wptests_tax', array(
+			'slug' => 'foo',
+		) );
+
+		$this->assertWPError( $updated );
+		$this->assertSame( 'duplicate_term_slug', $updated->get_error_code() );
+	}
+
+	/**
+	 * @ticket 5809
+	 */
+	public function test_wp_update_term_should_allow_duplicate_slugs_in_different_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		register_taxonomy( 'wptests_tax_2', 'post' );
+
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'bar',
+			'taxonomy' => 'wptests_tax_2',
+		) );
+
+		$updated = wp_update_term( $t2, 'wptests_tax_2', array(
+			'slug' => 'foo',
+		) );
+
+		$this->assertFalse( is_wp_error( $updated ) );
+
+		$t1_term = get_term( $t1, 'wptests_tax' );
+		$t2_term = get_term( $t2, 'wptests_tax_2' );
+		$this->assertSame( $t1_term->slug, $t2_term->slug );
+	}
+
+	/**
+	 * @ticket 30780
+	 */
+	public function test_wp_update_term_should_allow_duplicate_names_in_different_taxonomies() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		register_taxonomy( 'wptests_tax_2', 'post' );
+
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = $this->factory->term->create( array(
+			'name' => 'Bar',
+			'slug' => 'bar',
+			'taxonomy' => 'wptests_tax_2',
+		) );
+
+		$updated = wp_update_term( $t2, 'wptests_tax_2', array(
+			'name' => 'Foo',
+		) );
+
+		$this->assertFalse( is_wp_error( $updated ) );
+
+		$t2_term = get_term( $t2, 'wptests_tax_2' );
+		$this->assertSame( 'Foo', $t2_term->name );
+	}
+
+	/**
+	 * @ticket 30780
+	 */
+	public function test_wp_update_term_should_allow_duplicate_names_at_different_levels_of_the_same_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post', array(
+			'hierarchical' => true,
+		) );
+
+		$t1 = $this->factory->term->create( array(
+			'name' => 'Foo',
+			'slug' => 'foo',
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$t2 = $this->factory->term->create( array(
+			'name' => 'Bar',
+			'slug' => 'bar',
+			'taxonomy' => 'wptests_tax',
+			'parent' => $t1,
+		) );
+
+		$t3 = $this->factory->term->create( array(
+			'name' => 'Bar Child',
+			'slug' => 'bar-child',
+			'taxonomy' => 'wptests_tax',
+			'parent' => $t2,
+		) );
+
+		$updated = wp_update_term( $t3, 'wptests_tax', array(
+			'name' => 'Bar',
+		) );
+
+		$this->assertFalse( is_wp_error( $updated ) );
+
+		$t3_term = get_term( $t3, 'wptests_tax' );
+		$this->assertSame( 'Bar', $t3_term->name );
+	}
+
+	/**
+	 * @ticket 5809
+	 */
+	public function test_wp_update_term_should_split_shared_term() {
+		global $wpdb;
+
+		register_taxonomy( 'wptests_tax', 'post' );
+		register_taxonomy( 'wptests_tax_2', 'post' );
+
+		$t1 = wp_insert_term( 'Foo', 'wptests_tax' );
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax_2' );
+
+		// Manually modify because split terms shouldn't naturally occur.
+		$wpdb->update( $wpdb->term_taxonomy,
+			array( 'term_id' => $t1['term_id'] ),
+			array( 'term_taxonomy_id' => $t2['term_taxonomy_id'] ),
+			array( '%d' ),
+			array( '%d' )
+		);
+
+		$posts = $this->factory->post->create_many( 2 );
+		wp_set_object_terms( $posts[0], array( 'Foo' ), 'wptests_tax' );
+		wp_set_object_terms( $posts[1], array( 'Foo' ), 'wptests_tax_2' );
+
+		// Verify that the terms are shared.
+		$t1_terms = wp_get_object_terms( $posts[0], 'wptests_tax' );
+		$t2_terms = wp_get_object_terms( $posts[1], 'wptests_tax_2' );
+		$this->assertSame( $t1_terms[0]->term_id, $t2_terms[0]->term_id );
+
+		wp_update_term( $t2_terms[0]->term_id, 'wptests_tax_2', array(
+			'name' => 'New Foo',
+		) );
+
+		$t1_terms = wp_get_object_terms( $posts[0], 'wptests_tax' );
+		$t2_terms = wp_get_object_terms( $posts[1], 'wptests_tax_2' );
+		$this->assertNotEquals( $t1_terms[0]->term_id, $t2_terms[0]->term_id );
+	}
+
+	/**
+	 * @ticket 5809
+	 */
+	public function test_wp_update_term_should_not_split_shared_term_before_410_schema_change() {
+		global $wpdb;
+
+		$db_version = get_option( 'db_version' );
+		update_option( 'db_version', 30055 );
+
+		register_taxonomy( 'wptests_tax', 'post' );
+		register_taxonomy( 'wptests_tax_2', 'post' );
+
+		$t1 = wp_insert_term( 'Foo', 'wptests_tax' );
+		$t2 = wp_insert_term( 'Foo', 'wptests_tax_2' );
+
+		// Manually modify because split terms shouldn't naturally occur.
+		$wpdb->update( $wpdb->term_taxonomy,
+			array( 'term_id' => $t1['term_id'] ),
+			array( 'term_taxonomy_id' => $t2['term_taxonomy_id'] ),
+			array( '%d' ),
+			array( '%d' )
+		);
+
+		$posts = $this->factory->post->create_many( 2 );
+		wp_set_object_terms( $posts[0], array( 'Foo' ), 'wptests_tax' );
+		wp_set_object_terms( $posts[1], array( 'Foo' ), 'wptests_tax_2' );
+
+		// Verify that the term is shared.
+		$t1_terms = wp_get_object_terms( $posts[0], 'wptests_tax' );
+		$t2_terms = wp_get_object_terms( $posts[1], 'wptests_tax_2' );
+		$this->assertSame( $t1_terms[0]->term_id, $t2_terms[0]->term_id );
+
+		wp_update_term( $t2_terms[0]->term_id, 'wptests_tax_2', array(
+			'name' => 'New Foo',
+		) );
+
+		// Term should still be shared.
+		$t1_terms = wp_get_object_terms( $posts[0], 'wptests_tax' );
+		$t2_terms = wp_get_object_terms( $posts[1], 'wptests_tax_2' );
+		$this->assertSame( $t1_terms[0]->term_id, $t2_terms[0]->term_id );
+
+		update_option( 'db_version', $db_version );
+	}
+
+	public function test_wp_update_term_alias_of_no_term_group() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+		$term_1 = get_term( $t1, 'wptests_tax' );
+
+		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax' );
+		wp_update_term( $created_term_ids['term_id'], 'wptests_tax', array(
+			'alias_of' => $term_1->slug,
+		) );
+		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
+
+		$updated_term_1 = get_term( $t1, 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 0, $term_1->term_group );
+		$this->assertNotEmpty( $created_term->term_group );
+		$this->assertSame( $created_term->term_group, $updated_term_1->term_group );
+	}
+
+	public function test_wp_update_term_alias_of_existing_term_group() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+		$term_1 = get_term( $t1, 'wptests_tax' );
+
+		$t2 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'alias_of' => $term_1->slug,
+		) );
+		$term_2 = get_term( $t2, 'wptests_tax' );
+
+		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax' );
+		wp_update_term( $created_term_ids['term_id'], 'wptests_tax', array(
+			'alias_of' => $term_2->slug,
+		) );
+		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertNotEmpty( $created_term->term_group );
+		$this->assertSame( $created_term->term_group, $term_2->term_group );
+	}
+
+	public function test_wp_update_term_alias_of_nonexistent_term() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$created_term_ids = wp_insert_term( 'Foo', 'wptests_tax' );
+		wp_update_term( $created_term_ids['term_id'], 'wptests_tax', array(
+			'alias_of' => 'bar',
+		) );
+		$created_term = get_term( $created_term_ids['term_id'], 'wptests_tax' );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( 0, $created_term->term_group );
+	}
+
+	public function test_wp_update_term_slug_same_as_old_slug() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'foo',
+		) );
+
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'slug' => 'foo',
+		) );
+
+		$term = get_term( $t, 'wptests_tax' );
+
+		$this->assertSame( $t, $found['term_id'] );
+		$this->assertSame( 'foo', $term->slug );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	public function test_wp_update_term_duplicate_slug_generated_due_to_empty_slug_param() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'foo-bar',
+		) );
+		$t2 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'name' => 'not foo bar',
+		) );
+
+		$found = wp_update_term( $t2, 'wptests_tax', array(
+			'slug' => '',
+			'name' => 'Foo? Bar!', // Will sanitize to 'foo-bar'.
+		) );
+
+		$term = get_term( $t2, 'wptests_tax' );
+
+		$this->assertSame( $t2, $found['term_id'] );
+		$this->assertSame( 'foo-bar-2', $term->slug );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	public function test_wp_update_term_duplicate_slug_with_changed_parent() {
+		register_taxonomy( 'wptests_tax', 'post', array(
+			'hierarchical' => true,
+		) );
+		$p = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'foo-bar',
+		) );
+		$t2 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		$found = wp_update_term( $t2, 'wptests_tax', array(
+			'parent' => $p,
+			'slug' => 'foo-bar',
+		) );
+
+		$term = get_term( $t2, 'wptests_tax' );
+		$parent_term = get_term( $p, 'wptests_tax' );
+
+		$this->assertSame( $t2, $found['term_id'] );
+		$this->assertSame( 'foo-bar-' . $parent_term->slug, $term->slug );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	public function test_wp_update_term_duplicate_slug_failure() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'foo-bar',
+		) );
+		$t2 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'my-old-slug',
+		) );
+
+		$found = wp_update_term( $t2, 'wptests_tax', array(
+			'slug' => 'foo-bar',
+		) );
+
+		$term = get_term( $t2, 'wptests_tax' );
+
+		$this->assertWPError( $found );
+		$this->assertSame( 'duplicate_term_slug', $found->get_error_code() );
+		$this->assertSame( 'my-old-slug', $term->slug );
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	public function test_wp_update_term_should_return_term_id_and_term_taxonomy_id() {
+		register_taxonomy( 'wptests_tax', 'post' );
+		$t = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+		$found = wp_update_term( $t, 'wptests_tax', array(
+			'slug' => 'foo',
+		) );
+
+		$term_by_id = get_term( $found['term_id'], 'wptests_tax' );
+		$term_by_slug = get_term_by( 'slug', 'foo', 'wptests_tax' );
+		$term_by_ttid = get_term_by( 'term_taxonomy_id', $found['term_taxonomy_id'], 'wptests_tax' );
+
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertInternalType( 'array', $found );
+		$this->assertNotEmpty( $found['term_id'] );
+		$this->assertNotEmpty( $found['term_taxonomy_id'] );
+		$this->assertNotEmpty( $term_by_id );
+		$this->assertEquals( $term_by_id, $term_by_slug );
+		$this->assertEquals( $term_by_id, $term_by_ttid );
+	}
+
+	public function test_wp_update_term_should_clean_object_term_cache() {
+		register_taxonomy( 'wptests_tax_for_post', 'post' );
+		register_taxonomy( 'wptests_tax_for_page', 'page' );
+		$post = $this->factory->post->create();
+		$page = $this->factory->post->create( array(
+			'post_type' => 'page',
+		) );
+
+		$t_for_post = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax_for_post',
+		) );
+		$t_for_page = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax_for_page',
+		) );
+
+		wp_set_post_terms( $post, array( $t_for_post ), 'wptests_tax_for_post' );
+		wp_set_post_terms( $page, array( $t_for_page ), 'wptests_tax_for_page' );
+
+		// Prime caches and verify.
+		update_object_term_cache( array( $post ), 'post' );
+		update_object_term_cache( array( $page ), 'page' );
+		$this->assertNotEmpty( wp_cache_get( $post, 'wptests_tax_for_post_relationships' ) );
+		$this->assertNotEmpty( wp_cache_get( $page, 'wptests_tax_for_page_relationships' ) );
+
+		// Update a term in just one of the taxonomies.
+		$found = wp_update_term( $t_for_post, 'wptests_tax_for_post', array(
+			'slug' => 'foo',
+		) );
+
+		// Only the relevant cache should have been cleared.
+		$this->assertFalse( wp_cache_get( $post, 'wptests_tax_for_post_relationships' ) );
+		$this->assertNotEmpty( wp_cache_get( $page, 'wptests_tax_for_page_relationships' ) );
+	}
+
+	public function test_wp_update_term_should_clean_term_cache() {
+		register_taxonomy( 'wptests_tax', 'post', array(
+			'hierarchical' => true,
+		) );
+
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+		$t2 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+		) );
+
+		/*
+		 * It doesn't appear that WordPress itself ever sets these
+		 * caches, but we should ensure that they're being cleared for
+		 * compatibility with third-party addons. Prime the caches
+		 * manually.
+		 */
+		wp_cache_set( 'all_ids', array( 1, 2, 3 ), 'wptests_tax' );
+		wp_cache_set( 'get', array( 1, 2, 3 ), 'wptests_tax' );
+
+		$found = wp_update_term( $t1, 'wptests_tax', array(
+			'parent' => $t2,
+		) );
+		_unregister_taxonomy( 'wptests_tax' );
+
+		$this->assertSame( false, wp_cache_get( 'all_ids', 'wptests_tax' ) );
+		$this->assertSame( false, wp_cache_get( 'get', 'wptests_tax' ) );
+
+		$cached_children = get_option( 'wptests_tax_children' );
+		$this->assertNotEmpty( $cached_children[ $t2 ] );
+		$this->assertTrue( in_array( $found['term_id'], $cached_children[ $t2 ] ) );
+	}
+
+	/**
+	 * @ticket 30780
+	 */
+	public function test_wp_update_term_should_assign_new_slug_when_reassigning_parent_as_long_as_there_is_no_other_term_with_the_same_slug() {
+		register_taxonomy( 'wptests_tax', 'post', array(
+			'hierarchical' => true,
+		) );
+		register_taxonomy( 'wptests_tax_2', 'post', array(
+			'hierarchical' => true,
+		) );
+
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'parent-term',
+		) );
+
+		$t2 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'foo',
+		) );
+
+		wp_update_term( $t2, 'wptests_tax', array(
+			'parent' => $t1,
+		) );
+
+		$t2_term = get_term( $t2, 'wptests_tax' );
+
+		$this->assertSame( 'foo', $t2_term->slug );
+
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+
+	/**
+	 * @ticket 30780
+	 */
+	public function test_wp_update_term_should_not_assign_new_slug_when_reassigning_parent_as_long_as_there_is_no_other_slug_conflict_within_the_taxonomy() {
+		register_taxonomy( 'wptests_tax', 'post', array(
+			'hierarchical' => true,
+		) );
+		register_taxonomy( 'wptests_tax_2', 'post', array(
+			'hierarchical' => true,
+		) );
+
+		$t1 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'parent-term',
+		) );
+
+		// Same slug but in a different tax.
+		$t2 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax_2',
+			'slug' => 'foo',
+		) );
+
+		$t3 = $this->factory->term->create( array(
+			'taxonomy' => 'wptests_tax',
+			'slug' => 'foo',
+		) );
+
+		wp_update_term( $t3, 'wptests_tax', array(
+			'parent' => $t1,
+		) );
+
+		$t3_term = get_term( $t3, 'wptests_tax' );
+
+		$this->assertSame( 'foo', $t3_term->slug );
+
+		_unregister_taxonomy( 'wptests_tax' );
+	}
+}