diff --git a/tests/phpunit/tests/post.php b/tests/phpunit/tests/post.php
index cab19d86cc..9817bba6ee 100644
--- a/tests/phpunit/tests/post.php
+++ b/tests/phpunit/tests/post.php
@@ -985,44 +985,6 @@ class Tests_Post extends WP_UnitTestCase {
 		_unregister_post_type( 'post-type-1' );
 	}
 
-	/**
-	 * @ticket 18962
-	 */
-	function test_wp_unique_post_slug_with_hierarchy_and_attachments() {
-		register_post_type( 'post-type-1', array( 'hierarchical' => true ) );
-
-		$args = array(
-			'post_type' => 'post-type-1',
-			'post_name' => 'some-slug',
-			'post_status' => 'publish',
-		);
-		$one = $this->factory->post->create( $args );
-
-		$args = array(
-			'post_mime_type' => 'image/jpeg',
-			'post_type' => 'attachment',
-			'post_name' => 'image'
-		);
-		$attachment = $this->factory->attachment->create_object( 'image.jpg', $one, $args );
-
-		$args = array(
-			'post_type' => 'post-type-1',
-			'post_name' => 'image',
-			'post_status' => 'publish',
-			'post_parent' => $one
-		);
-		$two = $this->factory->post->create( $args );
-
-		$this->assertEquals( 'some-slug', get_post( $one )->post_name );
-		$this->assertEquals( 'image', get_post( $attachment )->post_name );
-		$this->assertEquals( 'image-2', get_post( $two )->post_name );
-
-		// 'image' can be a child of image-2
-		$this->assertEquals( 'image', wp_unique_post_slug( 'image', 0, 'publish', 'post-type-1', $two ) );
-
-		_unregister_post_type( 'post-type-1' );
-	}
-
 	/**
 	 * @ticket 21212
 	 */