diff --git a/tests/phpunit/tests/comment/getCommentAuthorEmailLink.php b/tests/phpunit/tests/comment/getCommentAuthorEmailLink.php
index 245f3df79c..1e31396d2c 100644
--- a/tests/phpunit/tests/comment/getCommentAuthorEmailLink.php
+++ b/tests/phpunit/tests/comment/getCommentAuthorEmailLink.php
@@ -18,8 +18,6 @@ class Tests_Comment_GetCommentAuthorEmailLink extends WP_UnitTestCase {
 	public function tearDown() {
 		unset( $GLOBALS['comment'] );
 		parent::tearDown();
-
-		add_filter( 'comment_email', 'antispambot' );
 	}
 
 	public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
diff --git a/tests/phpunit/tests/db.php b/tests/phpunit/tests/db.php
index a75371636b..29259d924f 100644
--- a/tests/phpunit/tests/db.php
+++ b/tests/phpunit/tests/db.php
@@ -35,14 +35,6 @@ class Tests_DB extends WP_UnitTestCase {
 		add_filter( 'query', array( $this, 'query_filter' ) );
 	}
 
-	/**
-	 * Tear down the test fixture
-	 */
-	public function tearDown() {
-		remove_filter( 'query', array( $this, 'query_filter' ) );
-		parent::tearDown();
-	}
-
 	/**
 	 * Log each query
 	 *
diff --git a/tests/phpunit/tests/formatting/ExcerptRemoveBlocks.php b/tests/phpunit/tests/formatting/ExcerptRemoveBlocks.php
index 01b2918bed..9e25158419 100644
--- a/tests/phpunit/tests/formatting/ExcerptRemoveBlocks.php
+++ b/tests/phpunit/tests/formatting/ExcerptRemoveBlocks.php
@@ -83,7 +83,6 @@ class Tests_Formatting_ExcerptRemoveBlocks extends WP_UnitTestCase {
 	function tearDown() {
 		$registry = WP_Block_Type_Registry::get_instance();
 		$registry->unregister( 'core/fake' );
-		wp_delete_post( self::$post_id, true );
 
 		parent::tearDown();
 	}
diff --git a/tests/phpunit/tests/formatting/redirect.php b/tests/phpunit/tests/formatting/redirect.php
index 0b9fc31a2d..c3db98976e 100644
--- a/tests/phpunit/tests/formatting/redirect.php
+++ b/tests/phpunit/tests/formatting/redirect.php
@@ -11,11 +11,6 @@ class Tests_Formatting_Redirect extends WP_UnitTestCase {
 		add_filter( 'home_url', array( $this, 'home_url' ) );
 	}
 
-	function tearDown() {
-		remove_filter( 'home_url', array( $this, 'home_url' ) );
-		parent::tearDown();
-	}
-
 	function home_url() {
 		return 'http://example.com/';
 	}
diff --git a/tests/phpunit/tests/functions/doEnclose.php b/tests/phpunit/tests/functions/doEnclose.php
index b308798f73..768afa4f0f 100644
--- a/tests/phpunit/tests/functions/doEnclose.php
+++ b/tests/phpunit/tests/functions/doEnclose.php
@@ -28,16 +28,6 @@ class Tests_Functions_DoEnclose extends WP_UnitTestCase {
 		add_filter( 'pre_http_request', array( $this, 'fake_http_request' ), 10, 3 );
 	}
 
-	/**
-	 * Cleanup after each test method.
-	 *
-	 * @since 5.3.0
-	 */
-	public function tearDown() {
-		parent::tearDown();
-		remove_filter( 'pre_http_request', array( $this, 'fake_http_request' ) );
-	}
-
 	/**
 	 * Test the function with an explicit content input.
 	 *
diff --git a/tests/phpunit/tests/general/wpGetDocumentTitle.php b/tests/phpunit/tests/general/wpGetDocumentTitle.php
index d86fd537e5..af78a52a62 100644
--- a/tests/phpunit/tests/general/wpGetDocumentTitle.php
+++ b/tests/phpunit/tests/general/wpGetDocumentTitle.php
@@ -53,11 +53,6 @@ class Tests_General_wpGetDocumentTitle extends WP_UnitTestCase {
 		setup_postdata( get_post( self::$post_id ) );
 	}
 
-	function tearDown() {
-		wp_reset_postdata();
-		parent::tearDown();
-	}
-
 	function _add_title_tag_support() {
 		add_theme_support( 'title-tag' );
 	}
diff --git a/tests/phpunit/tests/general/wpResourceHints.php b/tests/phpunit/tests/general/wpResourceHints.php
index a39d94d45b..4919945052 100644
--- a/tests/phpunit/tests/general/wpResourceHints.php
+++ b/tests/phpunit/tests/general/wpResourceHints.php
@@ -27,8 +27,6 @@ class Tests_General_wpResourceHints extends WP_UnitTestCase {
 	function tearDown() {
 		$GLOBALS['wp_scripts'] = $this->old_wp_scripts;
 		$GLOBALS['wp_styles']  = $this->old_wp_styles;
-		add_action( 'wp_default_scripts', 'wp_default_scripts' );
-		add_action( 'wp_default_styles', 'wp_default_styles' );
 		parent::tearDown();
 	}
 
diff --git a/tests/phpunit/tests/http/base.php b/tests/phpunit/tests/http/base.php
index 274a0a297d..d93c3fb9fd 100644
--- a/tests/phpunit/tests/http/base.php
+++ b/tests/phpunit/tests/http/base.php
@@ -39,13 +39,6 @@ abstract class WP_HTTP_UnitTestCase extends WP_UnitTestCase {
 		}
 	}
 
-	function tearDown() {
-		foreach ( array( 'curl', 'streams', 'fsockopen' ) as $t ) {
-			remove_filter( "use_{$t}_transport", '__return_false' );
-		}
-		parent::tearDown();
-	}
-
 	function filter_http_request_args( array $args ) {
 		$this->http_request_args = $args;
 		return $args;
diff --git a/tests/phpunit/tests/http/wpGetHttpHeaders.php b/tests/phpunit/tests/http/wpGetHttpHeaders.php
index 5611420402..9c6c025f03 100644
--- a/tests/phpunit/tests/http/wpGetHttpHeaders.php
+++ b/tests/phpunit/tests/http/wpGetHttpHeaders.php
@@ -16,16 +16,6 @@ class Tests_HTTP_wpGetHttpHeaders extends WP_UnitTestCase {
 		add_filter( 'pre_http_request', array( $this, 'fake_http_request' ), 10, 3 );
 	}
 
-	/**
-	 * Clean up environment
-	 */
-	public function tearDown() {
-		parent::tearDown();
-
-		// Clear the hook for the fake HTTP request response.
-		remove_filter( 'pre_http_request', array( $this, 'fake_http_request' ) );
-	}
-
 	/**
 	 * Test with a valid URL
 	 */
diff --git a/tests/phpunit/tests/image/base.php b/tests/phpunit/tests/image/base.php
index 6204709084..deaeaad33e 100644
--- a/tests/phpunit/tests/image/base.php
+++ b/tests/phpunit/tests/image/base.php
@@ -18,14 +18,6 @@ abstract class WP_Image_UnitTestCase extends WP_UnitTestCase {
 		add_filter( 'wp_image_editors', array( $this, 'setEngine' ), 10, 2 );
 	}
 
-	/**
-	 * Undo the image editor override
-	 */
-	public function tearDown() {
-		remove_filter( 'wp_image_editors', array( $this, 'setEngine' ), 10, 2 );
-		parent::tearDown();
-	}
-
 	/**
 	 * Override the image editor engine
 	 *
diff --git a/tests/phpunit/tests/image/resize.php b/tests/phpunit/tests/image/resize.php
index e5f90858df..3e3255e6a5 100644
--- a/tests/phpunit/tests/image/resize.php
+++ b/tests/phpunit/tests/image/resize.php
@@ -16,12 +16,6 @@ abstract class WP_Tests_Image_Resize_UnitTestCase extends WP_Image_UnitTestCase
 		add_filter( 'wp_image_editors', array( $this, 'wp_image_editors' ) );
 	}
 
-	public function tearDown() {
-		remove_filter( 'wp_image_editors', array( $this, 'wp_image_editors' ) );
-
-		parent::tearDown();
-	}
-
 	public function wp_image_editors() {
 		return array( $this->editor_engine );
 	}
diff --git a/tests/phpunit/tests/import/import.php b/tests/phpunit/tests/import/import.php
index 0dfb60b369..87ababf7a6 100644
--- a/tests/phpunit/tests/import/import.php
+++ b/tests/phpunit/tests/import/import.php
@@ -33,12 +33,6 @@ class Tests_Import_Import extends WP_Import_UnitTestCase {
 		}
 	}
 
-	function tearDown() {
-		remove_filter( 'import_allow_create_users', '__return_true' );
-
-		parent::tearDown();
-	}
-
 	function test_small_import() {
 		global $wpdb;
 
diff --git a/tests/phpunit/tests/l10n/getUserLocale.php b/tests/phpunit/tests/l10n/getUserLocale.php
index 814a82ce2e..f1d6f3828a 100644
--- a/tests/phpunit/tests/l10n/getUserLocale.php
+++ b/tests/phpunit/tests/l10n/getUserLocale.php
@@ -21,7 +21,6 @@ class Tests_L10n_GetUserLocale extends WP_UnitTestCase {
 	}
 
 	public function tearDown() {
-		delete_user_meta( $this->user_id, 'locale' );
 		set_current_screen( 'front' );
 
 		parent::tearDown();
diff --git a/tests/phpunit/tests/l10n/loadTextdomain.php b/tests/phpunit/tests/l10n/loadTextdomain.php
index 08be6b7cf7..ec54a0e6cd 100644
--- a/tests/phpunit/tests/l10n/loadTextdomain.php
+++ b/tests/phpunit/tests/l10n/loadTextdomain.php
@@ -26,13 +26,6 @@ class Tests_L10n_LoadTextdomain extends WP_UnitTestCase {
 		add_filter( 'theme_locale', array( $this, 'store_locale' ) );
 	}
 
-	public function tearDown() {
-		remove_filter( 'plugin_locale', array( $this, 'store_locale' ) );
-		remove_filter( 'theme_locale', array( $this, 'store_locale' ) );
-
-		parent::tearDown();
-	}
-
 	public function store_locale( $locale ) {
 		$this->locale = $locale;
 
diff --git a/tests/phpunit/tests/l10n/loadTextdomainJustInTime.php b/tests/phpunit/tests/l10n/loadTextdomainJustInTime.php
index 42f8e7ea4d..814f6562c8 100644
--- a/tests/phpunit/tests/l10n/loadTextdomainJustInTime.php
+++ b/tests/phpunit/tests/l10n/loadTextdomainJustInTime.php
@@ -40,9 +40,6 @@ class Tests_L10n_LoadTextdomainJustInTime extends WP_UnitTestCase {
 
 	public function tearDown() {
 		$GLOBALS['wp_theme_directories'] = $this->orig_theme_dir;
-		remove_filter( 'theme_root', array( $this, 'filter_theme_root' ) );
-		remove_filter( 'stylesheet_root', array( $this, 'filter_theme_root' ) );
-		remove_filter( 'template_root', array( $this, 'filter_theme_root' ) );
 		wp_clean_themes_cache();
 		unset( $GLOBALS['wp_themes'] );
 		unset( $GLOBALS['l10n'] );
diff --git a/tests/phpunit/tests/multisite/getSpaceAllowed.php b/tests/phpunit/tests/multisite/getSpaceAllowed.php
index b534d391be..a1c6678d76 100644
--- a/tests/phpunit/tests/multisite/getSpaceAllowed.php
+++ b/tests/phpunit/tests/multisite/getSpaceAllowed.php
@@ -10,16 +10,6 @@ if ( is_multisite() ) :
 	class Tests_Multisite_Get_Space_Allowed extends WP_UnitTestCase {
 		protected $suppress = false;
 
-		protected static $original_site_blog_upload_space;
-		protected static $original_blog_upload_space;
-
-		public static function setUpBeforeClass() {
-			parent::setUpBeforeClass();
-
-			self::$original_site_blog_upload_space = get_site_option( 'blog_upload_space' );
-			self::$original_blog_upload_space      = get_option( 'blog_upload_space' );
-		}
-
 		public function setUp() {
 			global $wpdb;
 			parent::setUp();
@@ -29,13 +19,6 @@ if ( is_multisite() ) :
 		public function tearDown() {
 			global $wpdb;
 
-			/**
-			 * Reset the two `blog_upload_space` options to their original values so
-			 * they can be relied on in other test classes.
-			 */
-			update_site_option( 'blog_upload_space', self::$original_site_blog_upload_space );
-			update_option( 'blog_upload_space', self::$original_blog_upload_space );
-
 			$wpdb->suppress_errors( $this->suppress );
 			parent::tearDown();
 		}
diff --git a/tests/phpunit/tests/multisite/isUploadSpaceAvailable.php b/tests/phpunit/tests/multisite/isUploadSpaceAvailable.php
index d8a79031ef..5abe85f9d4 100644
--- a/tests/phpunit/tests/multisite/isUploadSpaceAvailable.php
+++ b/tests/phpunit/tests/multisite/isUploadSpaceAvailable.php
@@ -13,16 +13,6 @@ if ( is_multisite() ) :
 	class Tests_Multisite_Is_Upload_Space_Available extends WP_UnitTestCase {
 		protected $suppress = false;
 
-		protected static $original_site_blog_upload_space;
-		protected static $original_blog_upload_space;
-
-		public static function setUpBeforeClass() {
-			parent::setUpBeforeClass();
-
-			self::$original_site_blog_upload_space = get_site_option( 'blog_upload_space' );
-			self::$original_blog_upload_space      = get_option( 'blog_upload_space' );
-		}
-
 		public function setUp() {
 			global $wpdb;
 			parent::setUp();
@@ -34,13 +24,6 @@ if ( is_multisite() ) :
 		public function tearDown() {
 			global $wpdb;
 
-			/**
-			 * Reset the two `blog_upload_space` options to their original values so
-			 * they can be relied on in other test classes.
-			 */
-			update_site_option( 'blog_upload_space', self::$original_site_blog_upload_space );
-			update_option( 'blog_upload_space', self::$original_blog_upload_space );
-
 			$wpdb->suppress_errors( $this->suppress );
 			parent::tearDown();
 		}
diff --git a/tests/phpunit/tests/multisite/ms-files-rewriting.php b/tests/phpunit/tests/multisite/ms-files-rewriting.php
index c7a8e7b8e3..dd0f3560db 100644
--- a/tests/phpunit/tests/multisite/ms-files-rewriting.php
+++ b/tests/phpunit/tests/multisite/ms-files-rewriting.php
@@ -26,7 +26,6 @@ if ( is_multisite() ) :
 		function tearDown() {
 			global $wpdb;
 
-			update_site_option( 'ms_files_rewriting', 0 );
 			$wpdb->suppress_errors( $this->suppress );
 
 			parent::tearDown();
diff --git a/tests/phpunit/tests/oembed/controller.php b/tests/phpunit/tests/oembed/controller.php
index d6be39409b..de4548a63a 100644
--- a/tests/phpunit/tests/oembed/controller.php
+++ b/tests/phpunit/tests/oembed/controller.php
@@ -64,8 +64,6 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		global $wp_rest_server;
 		$wp_rest_server = null;
 
-		remove_filter( 'pre_http_request', array( $this, 'mock_embed_request' ), 10 );
-		remove_filter( 'oembed_result', array( $this, 'filter_oembed_result' ), 10 );
 		parent::tearDown();
 	}
 
diff --git a/tests/phpunit/tests/post/revisions.php b/tests/phpunit/tests/post/revisions.php
index 95efe83578..7883483e40 100644
--- a/tests/phpunit/tests/post/revisions.php
+++ b/tests/phpunit/tests/post/revisions.php
@@ -20,11 +20,6 @@ class Tests_Post_Revisions extends WP_UnitTestCase {
 		$this->post_type = rand_str( 20 );
 	}
 
-	function tearDown() {
-		unset( $GLOBALS['wp_post_types'][ $this->post_type ] );
-		parent::tearDown();
-	}
-
 	/**
 	 * Note: Test needs reviewing when #16215 is fixed because I'm not sure the test current tests the "correct" behavior
 	 *
diff --git a/tests/phpunit/tests/query/isTerm.php b/tests/phpunit/tests/query/isTerm.php
index 1de8c522e9..77d7a597d9 100644
--- a/tests/phpunit/tests/query/isTerm.php
+++ b/tests/phpunit/tests/query/isTerm.php
@@ -65,17 +65,6 @@ class Tests_Query_IsTerm extends WP_UnitTestCase {
 		add_action( 'pre_get_posts', array( $this, 'pre_get_posts_tax_category_tax_query' ) );
 	}
 
-	function tearDown() {
-		global $wp_rewrite;
-
-		_unregister_taxonomy( 'testtax' );
-
-		$wp_rewrite->init();
-
-		remove_action( 'pre_get_posts', array( $this, 'pre_get_posts_tax_category_tax_query' ) );
-		parent::tearDown();
-	}
-
 	function test_tag_action_tax() {
 		// Tag with taxonomy added.
 		$this->go_to( home_url( '/tag/tag-slug/' ) );
diff --git a/tests/phpunit/tests/query/search.php b/tests/phpunit/tests/query/search.php
index c1c74c8240..b70bdc6d44 100644
--- a/tests/phpunit/tests/query/search.php
+++ b/tests/phpunit/tests/query/search.php
@@ -17,7 +17,6 @@ class Tests_Query_Search extends WP_UnitTestCase {
 	}
 
 	function tearDown() {
-		_unregister_post_type( $this->post_type );
 		unset( $this->q );
 
 		parent::tearDown();
diff --git a/tests/phpunit/tests/rest-api/rest-attachments-controller.php b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
index fe3c669c17..16cbcb61c8 100644
--- a/tests/phpunit/tests/rest-api/rest-attachments-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
@@ -95,9 +95,6 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			unlink( $this->test_file2 );
 		}
 
-		remove_action( 'rest_insert_attachment', array( $this, 'filter_rest_insert_attachment' ) );
-		remove_action( 'rest_after_insert_attachment', array( $this, 'filter_rest_after_insert_attachment' ) );
-
 		$this->remove_added_uploads();
 
 		if ( class_exists( WP_Image_Editor_Mock::class ) ) {
diff --git a/tests/phpunit/tests/rest-api/rest-categories-controller.php b/tests/phpunit/tests/rest-api/rest-categories-controller.php
index 5bd0d03a43..35ff944125 100644
--- a/tests/phpunit/tests/rest-api/rest-categories-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-categories-controller.php
@@ -1182,12 +1182,6 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		return 123;
 	}
 
-	public function tearDown() {
-		_unregister_taxonomy( 'batman' );
-		_unregister_taxonomy( 'robin' );
-		parent::tearDown();
-	}
-
 	protected function check_get_taxonomy_terms_response( $response ) {
 		$this->assertSame( 200, $response->get_status() );
 		$data       = $response->get_data();
diff --git a/tests/phpunit/tests/rest-api/rest-pages-controller.php b/tests/phpunit/tests/rest-api/rest-pages-controller.php
index 902272d7a1..6c524a10c2 100644
--- a/tests/phpunit/tests/rest-api/rest-pages-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-pages-controller.php
@@ -764,11 +764,6 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->assertArrayHasKey( 'type', $properties );
 	}
 
-	public function tearDown() {
-		parent::tearDown();
-		remove_filter( 'theme_page_templates', array( $this, 'filter_theme_page_templates' ) );
-	}
-
 	public function filter_theme_page_templates( $page_templates ) {
 		return array(
 			'page-my-test-template.php' => 'My Test Template',
diff --git a/tests/phpunit/tests/rest-api/rest-posts-controller.php b/tests/phpunit/tests/rest-api/rest-posts-controller.php
index 2d0e1767d0..7c0392dd27 100644
--- a/tests/phpunit/tests/rest-api/rest-posts-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-posts-controller.php
@@ -5088,13 +5088,10 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	}
 
 	public function tearDown() {
-		_unregister_post_type( 'private-post' );
-		_unregister_post_type( 'youseeme' );
 		if ( isset( $this->attachment_id ) ) {
 			$this->remove_added_uploads();
 		}
-		remove_filter( 'rest_pre_dispatch', array( $this, 'wpSetUpBeforeRequest' ), 10, 3 );
-		remove_filter( 'posts_clauses', array( $this, 'save_posts_clauses' ), 10, 2 );
+
 		parent::tearDown();
 	}
 
diff --git a/tests/phpunit/tests/rest-api/rest-revisions-controller.php b/tests/phpunit/tests/rest-api/rest-revisions-controller.php
index a1e982b8be..5bd08ec914 100644
--- a/tests/phpunit/tests/rest-api/rest-revisions-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-revisions-controller.php
@@ -76,12 +76,6 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 		$this->revision_id3    = $this->revision_3->ID;
 	}
 
-	public function tearDown() {
-		parent::tearDown();
-
-		remove_filter( 'map_meta_cap', array( $this, '_filter_map_meta_cap_remove_no_allow_revisions' ) );
-	}
-
 	public function _filter_map_meta_cap_remove_no_allow_revisions( $caps, $cap, $user_id, $args ) {
 		if ( 'delete_post' !== $cap || empty( $args ) ) {
 			return $caps;
diff --git a/tests/phpunit/tests/rest-api/rest-schema-setup.php b/tests/phpunit/tests/rest-api/rest-schema-setup.php
index 5f9bf079e2..3d0628d7ee 100644
--- a/tests/phpunit/tests/rest-api/rest-schema-setup.php
+++ b/tests/phpunit/tests/rest-api/rest-schema-setup.php
@@ -31,7 +31,6 @@ class WP_Test_REST_Schema_Initialization extends WP_Test_REST_TestCase {
 		global $wp_rest_server;
 		$wp_rest_server = null;
 
-		remove_filter( 'pre_http_request', array( $this, 'mock_embed_request' ), 10, 3 );
 		parent::tearDown();
 	}
 
diff --git a/tests/phpunit/tests/rest-api/rest-tags-controller.php b/tests/phpunit/tests/rest-api/rest-tags-controller.php
index 7d62f67282..83bb34517f 100644
--- a/tests/phpunit/tests/rest-api/rest-tags-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-tags-controller.php
@@ -1400,12 +1400,6 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		}
 	}
 
-	public function tearDown() {
-		_unregister_taxonomy( 'batman' );
-		_unregister_taxonomy( 'robin' );
-		parent::tearDown();
-	}
-
 	protected function check_get_taxonomy_terms_response( $response ) {
 		$this->assertSame( 200, $response->get_status() );
 		$data = $response->get_data();
diff --git a/tests/phpunit/tests/rewrite/numericSlugs.php b/tests/phpunit/tests/rewrite/numericSlugs.php
index 98f1368d42..1c547edea4 100644
--- a/tests/phpunit/tests/rewrite/numericSlugs.php
+++ b/tests/phpunit/tests/rewrite/numericSlugs.php
@@ -15,11 +15,6 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 		add_filter( 'wp_unique_post_slug', array( $this, 'filter_unique_post_slug' ), 10, 6 );
 	}
 
-	public function tearDown() {
-		parent::tearDown();
-		remove_filter( 'wp_unique_post_slug', array( $this, 'filter_unique_post_slug' ), 10, 6 );
-	}
-
 	public function test_go_to_year_segment_collision_without_title() {
 		global $wpdb;
 		$this->set_permalink_structure( '/%postname%/' );
diff --git a/tests/phpunit/tests/rewrite/oldSlugRedirect.php b/tests/phpunit/tests/rewrite/oldSlugRedirect.php
index 7177cbfa1e..724e698bb1 100644
--- a/tests/phpunit/tests/rewrite/oldSlugRedirect.php
+++ b/tests/phpunit/tests/rewrite/oldSlugRedirect.php
@@ -32,7 +32,6 @@ class Tests_Rewrite_OldSlugRedirect extends WP_UnitTestCase {
 	public function tearDown() {
 		$this->old_slug_redirect_url = null;
 
-		remove_filter( 'old_slug_redirect_url', array( $this, 'filter_old_slug_redirect_url' ), 10 );
 		parent::tearDown();
 	}
 
diff --git a/tests/phpunit/tests/rewrite/rewriteTags.php b/tests/phpunit/tests/rewrite/rewriteTags.php
index 402f5ed4c6..5afd25728a 100644
--- a/tests/phpunit/tests/rewrite/rewriteTags.php
+++ b/tests/phpunit/tests/rewrite/rewriteTags.php
@@ -7,14 +7,12 @@ class Tests_Rewrite_Tags extends WP_UnitTestCase {
 	protected $rewritecode;
 	protected $rewritereplace;
 	protected $queryreplace;
-	protected $wp_rewrite;
 
 	public function setUp() {
 		global $wp_rewrite;
 		parent::setUp();
 
-		$this->wp_rewrite = $wp_rewrite;
-		$wp_rewrite       = new WP_Rewrite();
+		$wp_rewrite = new WP_Rewrite();
 		$wp_rewrite->init();
 
 		$this->rewritecode    = $wp_rewrite->rewritecode;
@@ -22,11 +20,6 @@ class Tests_Rewrite_Tags extends WP_UnitTestCase {
 		$this->queryreplace   = $wp_rewrite->queryreplace;
 	}
 
-	public function tearDown() {
-		global $wp_rewrite;
-		$wp_rewrite = $this->wp_rewrite;
-	}
-
 	public function _invalid_rewrite_tags() {
 		return array(
 			array( 'foo', 'bar' ),
diff --git a/tests/phpunit/tests/theme/WPTheme.php b/tests/phpunit/tests/theme/WPTheme.php
index 28edec92ed..f738ad2052 100644
--- a/tests/phpunit/tests/theme/WPTheme.php
+++ b/tests/phpunit/tests/theme/WPTheme.php
@@ -20,9 +20,6 @@ class Tests_Theme_WPTheme extends WP_UnitTestCase {
 
 	function tearDown() {
 		$GLOBALS['wp_theme_directories'] = $this->orig_theme_dir;
-		remove_filter( 'theme_root', array( $this, '_theme_root' ) );
-		remove_filter( 'stylesheet_root', array( $this, '_theme_root' ) );
-		remove_filter( 'template_root', array( $this, '_theme_root' ) );
 		wp_clean_themes_cache();
 		unset( $GLOBALS['wp_themes'] );
 		parent::tearDown();
diff --git a/tests/phpunit/tests/theme/themeDir.php b/tests/phpunit/tests/theme/themeDir.php
index ae02c39008..b2a2542895 100644
--- a/tests/phpunit/tests/theme/themeDir.php
+++ b/tests/phpunit/tests/theme/themeDir.php
@@ -26,9 +26,6 @@ class Tests_Theme_ThemeDir extends WP_UnitTestCase {
 
 	function tearDown() {
 		$GLOBALS['wp_theme_directories'] = $this->orig_theme_dir;
-		remove_filter( 'theme_root', array( $this, '_theme_root' ) );
-		remove_filter( 'stylesheet_root', array( $this, '_theme_root' ) );
-		remove_filter( 'template_root', array( $this, '_theme_root' ) );
 		wp_clean_themes_cache();
 		unset( $GLOBALS['wp_themes'] );
 		parent::tearDown();
diff --git a/tests/phpunit/tests/user/author.php b/tests/phpunit/tests/user/author.php
index 0cae9b2bcb..21aa9f6b52 100644
--- a/tests/phpunit/tests/user/author.php
+++ b/tests/phpunit/tests/user/author.php
@@ -39,11 +39,6 @@ class Tests_User_Author_Template extends WP_UnitTestCase {
 		setup_postdata( get_post( self::$post_id ) );
 	}
 
-	function tearDown() {
-		wp_reset_postdata();
-		parent::tearDown();
-	}
-
 	function test_get_the_author() {
 		$author_name = get_the_author();
 		$user        = new WP_User( self::$author_id );
diff --git a/tests/phpunit/tests/user/countUserPosts.php b/tests/phpunit/tests/user/countUserPosts.php
index 7c6886dd0c..0e18f938aa 100644
--- a/tests/phpunit/tests/user/countUserPosts.php
+++ b/tests/phpunit/tests/user/countUserPosts.php
@@ -58,11 +58,6 @@ class Tests_User_CountUserPosts extends WP_UnitTestCase {
 		register_post_type( 'wptests_pt' );
 	}
 
-	public function tearDown() {
-		_unregister_post_type( 'wptests_pt' );
-		parent::tearDown();
-	}
-
 	public function test_count_user_posts_post_type_should_default_to_post() {
 		$this->assertEquals( 4, count_user_posts( self::$user_id ) );
 	}
diff --git a/tests/phpunit/tests/user/wpSendUserRequest.php b/tests/phpunit/tests/user/wpSendUserRequest.php
index 7a8ea6bbd7..0b4d19af80 100644
--- a/tests/phpunit/tests/user/wpSendUserRequest.php
+++ b/tests/phpunit/tests/user/wpSendUserRequest.php
@@ -76,7 +76,6 @@ class Tests_User_WpSendUserRequest extends WP_UnitTestCase {
 	 * @since 4.9.9
 	 */
 	public function tearDown() {
-		delete_option( 'WPLANG' );
 		reset_phpmailer_instance();
 
 		unset( $GLOBALS['locale'] );
diff --git a/tests/phpunit/tests/xmlrpc/wp/getPostType.php b/tests/phpunit/tests/xmlrpc/wp/getPostType.php
index cfff2320fc..5c0f4ddb19 100644
--- a/tests/phpunit/tests/xmlrpc/wp/getPostType.php
+++ b/tests/phpunit/tests/xmlrpc/wp/getPostType.php
@@ -23,12 +23,6 @@ class Tests_XMLRPC_wp_getPostType extends WP_XMLRPC_UnitTestCase {
 		register_post_type( $this->cpt_name, $this->cpt_args );
 	}
 
-	function tearDown() {
-		_unregister_post_type( $this->cpt_name );
-
-		parent::tearDown();
-	}
-
 	function test_invalid_username_password() {
 		$result = $this->myxmlrpcserver->wp_getPostType( array( 1, 'username', 'password', 'post' ) );
 		$this->assertIXRError( $result );
diff --git a/tests/phpunit/tests/xmlrpc/wp/getUser.php b/tests/phpunit/tests/xmlrpc/wp/getUser.php
index 9412dea89b..48f2b69494 100644
--- a/tests/phpunit/tests/xmlrpc/wp/getUser.php
+++ b/tests/phpunit/tests/xmlrpc/wp/getUser.php
@@ -17,13 +17,6 @@ class Tests_XMLRPC_wp_getUser extends WP_XMLRPC_UnitTestCase {
 		}
 	}
 
-	function tearDown() {
-		if ( is_multisite() ) {
-			revoke_super_admin( $this->administrator_id );
-		}
-		parent::tearDown();
-	}
-
 	function test_invalid_username_password() {
 		$result = $this->myxmlrpcserver->wp_getUser( array( 1, 'username', 'password', 1 ) );
 		$this->assertIXRError( $result );