diff --git a/tests/phpunit/tests/category.php b/tests/phpunit/tests/category.php
new file mode 100644
index 0000000000..71a267bf34
--- /dev/null
+++ b/tests/phpunit/tests/category.php
@@ -0,0 +1,247 @@
+<?php
+/**
+ * Validate Category API
+ *
+ * Notes:
+ * cat_is_ancestor_of is validated under test\term\term_is_ancestor_of
+ *
+ * @group category.php
+ */
+class Tests_Category extends WP_UnitTestCase {
+
+	function tearDown() {
+		parent::tearDown();
+
+		_unregister_taxonomy( 'test_tax_cat' );
+	}
+
+	/**
+	 * Validate get_all_category_ids
+	 */
+	function test_get_all_category_ids() {
+		// create categories
+		$this->factory->category->create_many(15);
+
+		// create new taxonomy to ensure not included
+		register_taxonomy( 'test_tax_cat', 'post' );
+		wp_insert_term( "test1", 'test_tax_cat' );
+		wp_insert_term( "test2", 'test_tax_cat' );
+		wp_insert_term( "test3", 'test_tax_cat' );
+
+		// Validate length is 1 + created due to uncategorized
+		$cat_ids = get_all_category_ids();
+		$this->assertEquals( 16, count($cat_ids));
+	}
+
+	/**
+	 * Validate get_category_by_slug function
+	 */
+	function test_get_category_by_slug() {
+
+		// create Test Categories
+		$testcat = $this->factory->category->create_and_get(
+			array(
+				'slug' => 'testcat',
+				'name' => 'Test Category 1'
+			)
+		);
+		$testcat2 = $this->factory->category->create_and_get(
+			array(
+				'slug' => 'testcat2',
+				'name' => 'Test Category 2'
+			)
+		);
+
+		// validate category is returned by slug
+		$ret_testcat = get_category_by_slug( 'testcat' );
+		$this->assertEquals( $testcat->term_id, $ret_testcat->term_id );
+		$ret_testcat = get_category_by_slug( 'TeStCaT' );
+		$this->assertEquals( $testcat->term_id, $ret_testcat->term_id );
+
+		// validate unknown category returns false
+		$this->assertFalse( get_category_by_slug( 'testcat3' ) );
+
+	}
+
+	/**
+	 * Validate _make_cat_compat function
+	 */
+	function test__make_cat_compat() {
+
+		// create Test Categories and Array Representations
+		$testcat_array = array(
+			'slug' => 'testmcc',
+			'name' => 'Test MCC',
+			'description' => 'Category Test'
+		);
+		$testcat = $this->factory->category->create_and_get( $testcat_array );
+		$testcat_array['term_id'] = $testcat->term_id;
+
+		$testcat2_array = array(
+			'slug' => 'testmcc',
+			'name' => 'Test MCC',
+			'description' => 'Category Test',
+			'parent' => $testcat->term_id
+		);
+		$testcat2 = $this->factory->category->create_and_get( $testcat2_array );
+		$testcat2_array['term_id'] = $testcat2->term_id;
+
+		// unset properties to enable validation of object
+		unset( $testcat->cat_ID );
+		unset( $testcat->category_count );
+		unset( $testcat->category_description );
+		unset( $testcat->cat_name );
+		unset( $testcat->category_nicename );
+		unset( $testcat->category_parent );
+
+		unset( $testcat2->cat_ID );
+		unset( $testcat2->category_count );
+		unset( $testcat2->category_description );
+		unset( $testcat2->cat_name );
+		unset( $testcat2->category_nicename );
+		unset( $testcat2->category_parent );
+
+		// make Compatible
+		_make_cat_compat( $testcat );
+		_make_cat_compat( $testcat2 );
+		_make_cat_compat( $testcat_array );
+		_make_cat_compat( $testcat2_array );
+
+		// Validate Compatibility Object
+		$this->assertEquals( $testcat->cat_ID, $testcat->term_id );
+		$this->assertEquals( $testcat->category_count, $testcat->count );
+		$this->assertEquals( $testcat->category_description, $testcat->description );
+		$this->assertEquals( $testcat->cat_name, $testcat->name );
+		$this->assertEquals( $testcat->category_nicename, $testcat->slug );
+		$this->assertEquals( $testcat->category_parent, $testcat->parent );
+
+		// Validate Compatibility Object with Parent
+		$this->assertEquals( $testcat->cat_ID, $testcat->term_id );
+		$this->assertEquals( $testcat->category_count, $testcat->count );
+		$this->assertEquals( $testcat->category_description, $testcat->description );
+		$this->assertEquals( $testcat->cat_name, $testcat->name );
+		$this->assertEquals( $testcat->category_nicename, $testcat->slug );
+		$this->assertEquals( $testcat->category_parent, $testcat->parent );
+
+		// Validate Compatibility Array
+		$this->assertEquals( $testcat_array['cat_ID'], $testcat_array['term_id'] );
+		$this->assertEquals( $testcat_array['category_count'], $testcat_array['count'] );
+		$this->assertEquals( $testcat_array['category_description'], $testcat_array['description'] );
+		$this->assertEquals( $testcat_array['cat_name'], $testcat_array['name'] );
+		$this->assertEquals( $testcat_array['category_nicename'], $testcat_array['slug'] );
+		$this->assertEquals( $testcat_array['category_parent'], $testcat_array['parent'] );
+
+		// Validate Compatibility Array with Parent
+		$this->assertEquals( $testcat_array['cat_ID'], $testcat_array['term_id'] );
+		$this->assertEquals( $testcat_array['category_count'], $testcat_array['count'] );
+		$this->assertEquals( $testcat_array['category_description'], $testcat_array['description'] );
+		$this->assertEquals( $testcat_array['cat_name'], $testcat_array['name'] );
+		$this->assertEquals( $testcat_array['category_nicename'], $testcat_array['slug'] );
+		$this->assertEquals( $testcat_array['category_parent'], $testcat_array['parent'] );
+	}
+
+	/**
+	 * Validate get_cat_name function
+	 */
+	function test_get_cat_name() {
+
+		// create Test Category
+		$testcat = $this->factory->category->create_and_get(
+			array(
+				'slug' => 'testcat',
+				'name' => 'Test Category 1'
+			)
+		);
+
+		// Validate
+		$this->assertEquals( $testcat->name, get_cat_name( $testcat->term_id ) );
+		$this->assertEquals( '', get_cat_name( -1 ) );
+		$this->assertEquals( '', get_cat_name( $testcat->term_id + 100 ) );
+
+	}
+
+	/**
+	 * Validate get_cat_name function
+	 */
+	function test_get_cat_ID() {
+
+		// create Test Category
+		$testcat = $this->factory->category->create_and_get(
+			array(
+				'slug' => 'testcat',
+				'name' => 'Test Category 1'
+			)
+		);
+
+		// Validate
+		$this->assertEquals( $testcat->term_id, get_cat_ID( $testcat->name ) );
+		$this->assertEquals( 0, get_cat_ID( "NO CAT" ) );
+		$this->assertEquals( 0, get_cat_ID( 12 ) );
+
+	}
+
+	/**
+	 * Validate get_category_by_path function
+	 */
+	function test_get_category_by_path() {
+
+		// create Test Categories
+		$root_id = $this->factory->category->create(
+			array(
+				'slug' => 'root',
+			)
+		);
+		$root_cat_id = $this->factory->category->create(
+			array(
+				'slug' => 'cat',
+				'parent' => $root_id
+			)
+		);
+		$root_cat_cat_id = $this->factory->category->create(
+			array(
+				'slug' => 'cat', //note this is modified on create
+				'parent' => $root_cat_id
+			)
+		);
+		$root_path_id = $this->factory->category->create(
+			array(
+				'slug' => 'path',
+				'parent' => $root_id
+			)
+		);
+		$root_path_cat_id = $this->factory->category->create(
+			array(
+				'slug' => 'cat', //note this is modified on create
+				'parent' => $root_path_id
+			)
+		);
+		$root_level_id = $this->factory->category->create(
+			array(
+				'slug' => 'level-1',
+				'parent' => $root_id
+			)
+		);
+		$root_level_cat_id = $this->factory->category->create(
+			array(
+				'slug' => 'cat', //note this is modified on create
+				'parent' => $root_level_id
+			)
+		);
+
+		// Validate Full Match
+		$ret_cat = get_category_by_path( '/root/level-1', true );
+		$this->assertEquals( $root_level_id, $ret_cat->term_id );
+		$this->assertNull( get_category_by_path( 'level-1', true ) );
+		$this->assertNull( get_category_by_path( 'nocat/nocat/', true) );
+
+		// Validate Partial Match
+		$ret_cat = get_category_by_path( 'level-1', false );
+		$this->assertEquals( $root_level_id, $ret_cat->term_id );
+		$ret_cat = get_category_by_path( 'root/cat/level-1', false );
+		$this->assertEquals( $root_level_id, $ret_cat->term_id );
+		$ret_cat = get_category_by_path( 'root$2Fcat%20%2Flevel-1', false );
+		$this->assertEquals( $root_level_id, $ret_cat->term_id );
+		$this->assertNull( get_category_by_path( 'nocat/nocat/', false) );
+	}
+
+}
\ No newline at end of file
diff --git a/tests/phpunit/tests/term.php b/tests/phpunit/tests/term.php
index 465c635013..f2d3ee419b 100644
--- a/tests/phpunit/tests/term.php
+++ b/tests/phpunit/tests/term.php
@@ -325,6 +325,9 @@ class Tests_Term extends WP_UnitTestCase {
 			$this->assertTrue( (bool) wp_delete_post( $post_id, true ) );
 	}
 
+	/**
+	 * @group category.php
+	 */
 	function test_term_is_ancestor_of( ) {
 		$term = rand_str();
 		$term2 = rand_str();