diff --git a/tests/phpunit/tests/functions/wpListUtil.php b/tests/phpunit/tests/functions/wpListUtil.php
index 69b32d95f4..65bff58a82 100644
--- a/tests/phpunit/tests/functions/wpListUtil.php
+++ b/tests/phpunit/tests/functions/wpListUtil.php
@@ -5,167 +5,6 @@
  */
 class Tests_Functions_wpListUtil extends WP_UnitTestCase {
 
-	public function data_test_wp_list_pluck() {
-		return array(
-			'arrays'                         => array(
-				array(
-					array(
-						'foo' => 'bar',
-						'bar' => 'baz',
-						'abc' => 'xyz',
-					),
-					array(
-						'foo'   => 'foo',
-						'123'   => '456',
-						'lorem' => 'ipsum',
-					),
-					array( 'foo' => 'baz' ),
-				),
-				'foo',
-				null,
-				array( 'bar', 'foo', 'baz' ),
-			),
-			'arrays with index key'          => array(
-				array(
-					array(
-						'foo' => 'bar',
-						'bar' => 'baz',
-						'abc' => 'xyz',
-						'key' => 'foo',
-					),
-					array(
-						'foo'   => 'foo',
-						'123'   => '456',
-						'lorem' => 'ipsum',
-						'key'   => 'bar',
-					),
-					array(
-						'foo' => 'baz',
-						'key' => 'value',
-					),
-				),
-				'foo',
-				'key',
-				array(
-					'foo'   => 'bar',
-					'bar'   => 'foo',
-					'value' => 'baz',
-				),
-			),
-			'arrays with index key missing'  => array(
-				array(
-					array(
-						'foo' => 'bar',
-						'bar' => 'baz',
-						'abc' => 'xyz',
-					),
-					array(
-						'foo'   => 'foo',
-						'123'   => '456',
-						'lorem' => 'ipsum',
-						'key'   => 'bar',
-					),
-					array(
-						'foo' => 'baz',
-						'key' => 'value',
-					),
-				),
-				'foo',
-				'key',
-				array(
-					'bar',
-					'bar'   => 'foo',
-					'value' => 'baz',
-				),
-			),
-			'objects'                        => array(
-				array(
-					(object) array(
-						'foo' => 'bar',
-						'bar' => 'baz',
-						'abc' => 'xyz',
-					),
-					(object) array(
-						'foo'   => 'foo',
-						'123'   => '456',
-						'lorem' => 'ipsum',
-					),
-					(object) array( 'foo' => 'baz' ),
-				),
-				'foo',
-				null,
-				array( 'bar', 'foo', 'baz' ),
-			),
-			'objects with index key'         => array(
-				array(
-					(object) array(
-						'foo' => 'bar',
-						'bar' => 'baz',
-						'abc' => 'xyz',
-						'key' => 'foo',
-					),
-					(object) array(
-						'foo'   => 'foo',
-						'123'   => '456',
-						'lorem' => 'ipsum',
-						'key'   => 'bar',
-					),
-					(object) array(
-						'foo' => 'baz',
-						'key' => 'value',
-					),
-				),
-				'foo',
-				'key',
-				array(
-					'foo'   => 'bar',
-					'bar'   => 'foo',
-					'value' => 'baz',
-				),
-			),
-			'objects with index key missing' => array(
-				array(
-					(object) array(
-						'foo' => 'bar',
-						'bar' => 'baz',
-						'abc' => 'xyz',
-					),
-					(object) array(
-						'foo'   => 'foo',
-						'123'   => '456',
-						'lorem' => 'ipsum',
-						'key'   => 'bar',
-					),
-					(object) array(
-						'foo' => 'baz',
-						'key' => 'value',
-					),
-				),
-				'foo',
-				'key',
-				array(
-					'bar',
-					'bar'   => 'foo',
-					'value' => 'baz',
-				),
-			),
-		);
-	}
-
-	/**
-	 * @dataProvider data_test_wp_list_pluck
-	 *
-	 * @covers ::wp_list_pluck
-	 *
-	 * @param array      $list      List of objects or arrays.
-	 * @param int|string $field     Field from the object to place instead of the entire object
-	 * @param int|string $index_key Field from the object to use as keys for the new array.
-	 * @param array      $expected  Expected result.
-	 */
-	public function test_wp_list_pluck( $list, $field, $index_key, $expected ) {
-		$this->assertSameSetsWithIndex( $expected, wp_list_pluck( $list, $field, $index_key ) );
-	}
-
 	public function data_test_wp_list_filter() {
 		return array(
 			'string instead of array'  => array(