diff --git a/tests/phpunit/tests/multisite/cleanDirsizeCache.php b/tests/phpunit/tests/multisite/cleanDirsizeCache.php
index 2271c3b6bcfe9..8aa0ed0491f3f 100644
--- a/tests/phpunit/tests/multisite/cleanDirsizeCache.php
+++ b/tests/phpunit/tests/multisite/cleanDirsizeCache.php
@@ -208,8 +208,8 @@ public function test_get_dirsize_cache_in_recurse_dirsize_upload() {
 	public function test_pre_recurse_dirsize_filter() {
 		add_filter( 'pre_recurse_dirsize', array( $this, 'filter_pre_recurse_dirsize' ) );
 
-		$upload_dir = wp_upload_dir();
-		$this->assertSame( 1042, recurse_dirsize( $upload_dir['path'] ) );
+		$directory_cache = array();
+		$this->assertSame( 1042, recurse_dirsize( __DIR__, null, null, $directory_cache ) );
 
 		remove_filter( 'pre_recurse_dirsize', array( $this, 'filter_pre_recurse_dirsize' ) );
 	}
diff --git a/tests/phpunit/tests/multisite/network.php b/tests/phpunit/tests/multisite/network.php
index a5741e91f93f7..8cbc3c177601e 100644
--- a/tests/phpunit/tests/multisite/network.php
+++ b/tests/phpunit/tests/multisite/network.php
@@ -17,6 +17,7 @@ class Tests_Multisite_Network extends WP_UnitTestCase {
 	public function tear_down() {
 		global $current_site;
 		$current_site->id = 1;
+		wp_installing( false );
 		parent::tear_down();
 	}
 
diff --git a/tests/phpunit/tests/multisite/site.php b/tests/phpunit/tests/multisite/site.php
index 920a76f6a7e30..36b7332da5690 100644
--- a/tests/phpunit/tests/multisite/site.php
+++ b/tests/phpunit/tests/multisite/site.php
@@ -25,6 +25,7 @@ public function set_up() {
 	public function tear_down() {
 		global $wpdb;
 		$wpdb->suppress_errors( $this->suppress );
+		wp_installing( false );
 		parent::tear_down();
 	}
 
@@ -2052,7 +2053,7 @@ public function test_wp_initialize_site_empty_id() {
 	 * @ticket 41333
 	 */
 	public function test_wp_initialize_site_invalid_id() {
-		$result = wp_initialize_site( 123 );
+		$result = wp_initialize_site( PHP_INT_MAX );
 		$this->assertWPError( $result );
 		$this->assertSame( 'site_invalid_id', $result->get_error_code() );
 	}
@@ -2090,7 +2091,7 @@ public function test_wp_uninitialize_site_empty_id() {
 	 * @ticket 41333
 	 */
 	public function test_wp_uninitialize_site_invalid_id() {
-		$result = wp_uninitialize_site( 123 );
+		$result = wp_uninitialize_site( PHP_INT_MAX );
 		$this->assertWPError( $result );
 		$this->assertSame( 'site_invalid_id', $result->get_error_code() );
 	}
diff --git a/tests/phpunit/tests/multisite/siteMeta.php b/tests/phpunit/tests/multisite/siteMeta.php
index 066068b415296..dd970e001b24d 100644
--- a/tests/phpunit/tests/multisite/siteMeta.php
+++ b/tests/phpunit/tests/multisite/siteMeta.php
@@ -259,6 +259,8 @@ public function test_lazy_load_site_meta() {
 			$this->markTestSkipped( 'Test only runs with the blogmeta database table installed.' );
 		}
 
+		$this->reset_lazyload_queue();
+
 		$filter = new MockAction();
 		add_filter( 'update_blog_metadata_cache', array( $filter, 'filter' ), 10, 2 );
 
@@ -294,6 +296,8 @@ public function test_lazy_load_site_meta_fields_id() {
 			$this->markTestSkipped( 'Test only runs with the blogmeta database table installed.' );
 		}
 
+		$this->reset_lazyload_queue();
+
 		$filter = new MockAction();
 		add_filter( 'update_blog_metadata_cache', array( $filter, 'filter' ), 10, 2 );
 
diff --git a/tests/phpunit/tests/rest-api/rest-attachments-controller.php b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
index 4dd0b60172cb4..f81c21d4d81a3 100644
--- a/tests/phpunit/tests/rest-api/rest-attachments-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
@@ -5583,7 +5583,7 @@ public function test_create_item_from_url_exceeds_multisite_site_upload_space()
 		add_filter( 'pre_http_request', array( $this, 'mock_image_download' ), 10, 3 );
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$request->set_param( 'url', 'https://example.com/no-space.jpg' );
+		$request->set_param( 'url', home_url( '/no-space.jpg' ) );
 		$request->set_param( 'generate_sub_sizes', false );
 
 		$response = rest_get_server()->dispatch( $request );