diff --git a/package_manager/tests/src/Functional/ExcludedPathsTest.php b/package_manager/tests/src/Functional/ExcludedPathsTest.php
index f9e53994df7180eb92af4a9513f7b09ed686032d..287080699672f02acab81fbd22d92d78eb7a7a77 100644
--- a/package_manager/tests/src/Functional/ExcludedPathsTest.php
+++ b/package_manager/tests/src/Functional/ExcludedPathsTest.php
@@ -119,21 +119,21 @@ class ExcludedPathsTest extends BrowserTestBase {
     $stage_dir = $stage::$stagingRoot . DIRECTORY_SEPARATOR . $stage->create();
 
     $this->assertDirectoryExists($stage_dir);
-    $this->assertDirectoryNotExists("$stage_dir/sites/simpletest");
-    $this->assertFileNotExists("$stage_dir/vendor/web.config");
-    $this->assertDirectoryNotExists("$stage_dir/$site_path/files");
-    $this->assertDirectoryNotExists("$stage_dir/private");
-    $this->assertFileNotExists("$stage_dir/$site_path/settings.php");
-    $this->assertFileNotExists("$stage_dir/$site_path/settings.local.php");
-    $this->assertFileNotExists("$stage_dir/$site_path/services.yml");
+    $this->assertDirectoryDoesNotExist("$stage_dir/sites/simpletest");
+    $this->assertFileDoesNotExist("$stage_dir/vendor/web.config");
+    $this->assertDirectoryDoesNotExist("$stage_dir/$site_path/files");
+    $this->assertDirectoryDoesNotExist("$stage_dir/private");
+    $this->assertFileDoesNotExist("$stage_dir/$site_path/settings.php");
+    $this->assertFileDoesNotExist("$stage_dir/$site_path/settings.local.php");
+    $this->assertFileDoesNotExist("$stage_dir/$site_path/services.yml");
     // SQLite databases and their support files should never be staged.
-    $this->assertFileNotExists("$stage_dir/$site_path/db.sqlite");
-    $this->assertFileNotExists("$stage_dir/$site_path/db.sqlite-shm");
-    $this->assertFileNotExists("$stage_dir/$site_path/db.sqlite-wal");
+    $this->assertFileDoesNotExist("$stage_dir/$site_path/db.sqlite");
+    $this->assertFileDoesNotExist("$stage_dir/$site_path/db.sqlite-shm");
+    $this->assertFileDoesNotExist("$stage_dir/$site_path/db.sqlite-wal");
     // Default site-specific settings files should never be staged.
-    $this->assertFileNotExists("$stage_dir/sites/default/settings.php");
-    $this->assertFileNotExists("$stage_dir/sites/default/settings.local.php");
-    $this->assertFileNotExists("$stage_dir/sites/default/services.yml");
+    $this->assertFileDoesNotExist("$stage_dir/sites/default/settings.php");
+    $this->assertFileDoesNotExist("$stage_dir/sites/default/settings.local.php");
+    $this->assertFileDoesNotExist("$stage_dir/sites/default/services.yml");
     // A non-excluded file in the default site directory should be staged.
     $this->assertFileExists("$stage_dir/sites/default/stage.txt");
 
@@ -148,7 +148,7 @@ class ExcludedPathsTest extends BrowserTestBase {
     }
     $stage->apply();
     foreach ($files as $file) {
-      $this->assertFileNotExists("$active_dir/$file");
+      $this->assertFileDoesNotExist("$active_dir/$file");
     }
   }
 
diff --git a/package_manager/tests/src/Kernel/ComposerUtilityTest.php b/package_manager/tests/src/Kernel/ComposerUtilityTest.php
index d770cd3a12835108d85b667935c9b59b384cf4d1..2356c46209eec3e0ad2c442b9a204e6803ccb0fb 100644
--- a/package_manager/tests/src/Kernel/ComposerUtilityTest.php
+++ b/package_manager/tests/src/Kernel/ComposerUtilityTest.php
@@ -26,7 +26,7 @@ class ComposerUtilityTest extends KernelTestBase {
     file_put_contents($dir . '/composer.json', '{}');
 
     ComposerUtility::createForDirectory($dir);
-    $this->assertFileNotExists($dir . '/.htaccess');
+    $this->assertFileDoesNotExist($dir . '/.htaccess');
   }
 
   /**
diff --git a/tests/src/Build/CoreUpdateTest.php b/tests/src/Build/CoreUpdateTest.php
index 8b579dd57b15ed670d5755c114fe5f8daa905d95..662090dc8b14b2f68a3c1b9d21fc08cc898be75d 100644
--- a/tests/src/Build/CoreUpdateTest.php
+++ b/tests/src/Build/CoreUpdateTest.php
@@ -51,7 +51,7 @@ class CoreUpdateTest extends UpdateTestBase {
     // ignores .htaccess files and everything in them, so a Composer-generated
     // .htaccess file won't cause this test to fail.
     if ($template === 'drupal/recommended-project') {
-      $this->assertFileNotExists($dir . '/.htaccess');
+      $this->assertFileDoesNotExist($dir . '/.htaccess');
     }
 
     // Ensure that Drupal thinks we are running 9.8.0, then refresh information
diff --git a/tests/src/Functional/FileSystemOperationsTest.php b/tests/src/Functional/FileSystemOperationsTest.php
index 3bb2bdb3f71b63576cc11f6b9f107e2c94d28313..4e812a080b423fe3f2c8e8b9c5381dada270467c 100644
--- a/tests/src/Functional/FileSystemOperationsTest.php
+++ b/tests/src/Functional/FileSystemOperationsTest.php
@@ -118,7 +118,7 @@ class FileSystemOperationsTest extends AutomaticUpdatesFunctionalTestBase {
     // Make the staged site directory read-only, so we can test that it will be
     // made writable on clean-up.
     $this->assertTrue(chmod("$this->stageDir/$stage_id/sites/default", 0400));
-    $this->assertNotIsWritable("$this->stageDir/$stage_id/sites/default/staged.txt");
+    $this->assertIsNotWritable("$this->stageDir/$stage_id/sites/default/staged.txt");
     // If the site directory is not writable, this will throw an exception.
     $this->updater->destroy();
     $this->assertDirectoryDoesNotExist($this->stageDir);