diff --git a/tests/phpunit/tests/formatting/MapDeep.php b/tests/phpunit/tests/formatting/MapDeep.php
deleted file mode 100644
index 7ed88feae2..0000000000
--- a/tests/phpunit/tests/formatting/MapDeep.php
+++ /dev/null
@@ -1,63 +0,0 @@
-<?php
-/**
- * @group formatting
- * @ticket 22300
- */
-class Tests_Formatting_MapDeep extends WP_UnitTestCase {
-	function setUp() {
-		if ( ! function_exists( 'map_deep' ) ) {
-			$this->markTestSkipped( "map_deep function doesn't exist" );
-		}
-
-		parent::setUp();
-	}
-
-	function test_map_deep_with_any_function_over_empty_array_should_return_empty_array() {
-		$this->assertEquals( array(), map_deep( array( $this, 'return_baba' ), array() ) );
-	}
-
-	function test_map_deep_should_map_each_element_of_array_one_level_deep() {
-		$this->assertEquals( array( 'ababa', 'xbaba' ), map_deep( array( $this, 'append_baba' ), array( 'a', 'x' ) ) );
-	}
-
-	function test_map_deep_should_map_each_element_of_array_two_levels_deep() {
-		$this->assertEquals( array( 'ababa', array( 'xbaba' ) ), map_deep( array( $this, 'append_baba' ), array( 'a', array( 'x' ) ) ) );
-	}
-
-	function test_map_deep_should_map_each_object_element_of_an_array() {
-		$this->assertEquals( array( 'var0' => 'ababa', 'var1' => (object)array( 'xbaba' ) ),
-			map_deep( array( $this, 'append_baba' ), array( 'var0' => 'a', 'var1' => (object)array( 'x' ) ) ) );
-	}
-
-	function test_map_deep_should_apply_the_function_to_a_string() {
-		$this->assertEquals( 'xbaba', map_deep( array( $this, 'append_baba' ), 'x' ) );
-	}
-
-	function test_map_deep_should_apply_the_function_to_an_integer() {
-		$this->assertEquals( '5baba' , map_deep( array( $this, 'append_baba' ), 5 ) );
-	}
-
-	function test_map_deep_should_map_each_property_of_an_object() {
-		$this->assertEquals( (object)array( 'var0' => 'ababa', 'var1' => 'xbaba' ),
-			map_deep( array( $this, 'append_baba' ), (object)array( 'var0' => 'a', 'var1' => 'x' ) ) );
-	}
-
-	function test_map_deep_should_map_each_array_property_of_an_object() {
-		$this->assertEquals( (object)array( 'var0' => 'ababa', 'var1' => array( 'xbaba' ) ),
-			map_deep( array( $this, 'append_baba' ), (object)array( 'var0' => 'a', 'var1' => array( 'x' ) ) ) );
-	}
-
-	function test_map_deep_should_map_each_object_property_of_an_object() {
-		$this->assertEquals( (object)array( 'var0' => 'ababa', 'var1' => (object)array( 'xbaba' ) ),
-			map_deep( array( $this, 'append_baba' ), (object)array( 'var0' => 'a', 'var1' => (object)array( 'x' ) ) ) );
-	}
-
-	function return_baba( $value ) {
-		return 'baba';
-	}
-
-	function append_baba( $value ) {
-		return $value . 'baba';
-	}
-}
-