diff --git a/automatic_updates.module b/automatic_updates.module
index e8a71bd01d3f5015797358512a1fb079f387a317..3a4373ee7d3b79c05e0c4be75c38e5adb3450c89 100644
--- a/automatic_updates.module
+++ b/automatic_updates.module
@@ -135,7 +135,6 @@ function automatic_updates_module_implements_alter(&$implementations, $hook) {
     unset($implementations['update']);
   }
   if ($hook === 'cron') {
-    // Whatever mofo.
     $hook = $implementations['automatic_updates'];
     unset($implementations['automatic_updates']);
     $implementations['automatic_updates'] = $hook;
diff --git a/package_manager/package_manager.module b/package_manager/package_manager.module
index f369d8419a7e92d70f2cd6ab900b683fc5b07e06..3fdd45ade2d6e587e710046a90f66380815c909f 100644
--- a/package_manager/package_manager.module
+++ b/package_manager/package_manager.module
@@ -8,6 +8,8 @@
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\package_manager\Validator\ComposerExecutableValidator;
 
+// cspell:ignore grasmash
+
 /**
  * Implements hook_help().
  */
diff --git a/package_manager/src/Event/RequireEventTrait.php b/package_manager/src/Event/RequireEventTrait.php
index f93853967311871a83581ccd47c76145a72d5c2f..96d4c0d3bf2176854fc7e2a092e388baa1fc8408 100644
--- a/package_manager/src/Event/RequireEventTrait.php
+++ b/package_manager/src/Event/RequireEventTrait.php
@@ -35,9 +35,9 @@ trait RequireEventTrait {
    *   The stage.
    * @param string[] $runtime_packages
    *   The runtime (i.e., non-dev) packages to be required, in the form
-   *   'vendor/name:constrant'.
+   *   'vendor/name:constraint'.
    * @param string[] $dev_packages
-   *   The dev packages to be required, in the form 'vendor/name:constrant'.
+   *   The dev packages to be required, in the form 'vendor/name:constraint'.
    */
   public function __construct(Stage $stage, array $runtime_packages, array $dev_packages = []) {
     $this->runtimePackages = $runtime_packages;
diff --git a/package_manager/src/FailureMarker.php b/package_manager/src/FailureMarker.php
index 14b5ee90e51c75d21285857eae39cd6ec92b4c22..dab1e88f9a079384674a05f73ae118047edca969 100644
--- a/package_manager/src/FailureMarker.php
+++ b/package_manager/src/FailureMarker.php
@@ -12,7 +12,7 @@ use Drupal\package_manager\Exception\ApplyFailedException;
  * code is copied back into it, and then removed afterwards. This allows us to
  * know if a commit operation failed midway through, which could leave the site
  * code base in an indeterminate state -- which, in the worst case scenario,
- * might render Drupal unbootable.
+ * might render Drupal being unable to boot.
  */
 final class FailureMarker {
 
diff --git a/package_manager/src/ProcessFactory.php b/package_manager/src/ProcessFactory.php
index e3cfd03514c523f8174fc3fbf19ff12da3973640..b0d40141eda3021c33a96ff33bb6da237a041396 100644
--- a/package_manager/src/ProcessFactory.php
+++ b/package_manager/src/ProcessFactory.php
@@ -8,6 +8,8 @@ use PhpTuf\ComposerStager\Infrastructure\Factory\Process\ProcessFactoryInterface
 use PhpTuf\ComposerStager\Infrastructure\Factory\Process\ProcessFactory as StagerProcessFactory;
 use Symfony\Component\Process\Process;
 
+// cspell:ignore BINDIR
+
 /**
  * Defines a process factory which sets the COMPOSER_HOME environment variable.
  *
diff --git a/package_manager/tests/src/Kernel/StageTest.php b/package_manager/tests/src/Kernel/StageTest.php
index 1acb0f383952b20046062271bf1b9494ede0a2c9..392d1eea7b8c6e87a4164c8cc00e2f77ede6b6cc 100644
--- a/package_manager/tests/src/Kernel/StageTest.php
+++ b/package_manager/tests/src/Kernel/StageTest.php
@@ -355,7 +355,7 @@ class StageTest extends PackageManagerKernelTestBase {
     $stage->destroy();
 
     // Even through the previous stage was destroyed, we cannot create a new one
-    // bceause the failure marker is still there.
+    // because the failure marker is still there.
     $stage = $this->createStage();
     try {
       $stage->create();
@@ -444,7 +444,7 @@ class StageTest extends PackageManagerKernelTestBase {
    * @param string $package_name
    *   The package name.
    * @param bool $is_invalid
-   *   TRUE if the gien package name is invalid and will cause an exception,
+   *   TRUE if the given package name is invalid and will cause an exception,
    *   FALSE otherwise.
    *
    * @dataProvider providerValidatePackageNames
diff --git a/package_manager/tests/src/Kernel/StageValidationExceptionTest.php b/package_manager/tests/src/Kernel/StageValidationExceptionTest.php
index b169da586731e1e05a97729d504e7b3e81843568..5fe49b2b4283f47863c83cf8ad6aa813aa4f09f4 100644
--- a/package_manager/tests/src/Kernel/StageValidationExceptionTest.php
+++ b/package_manager/tests/src/Kernel/StageValidationExceptionTest.php
@@ -28,7 +28,7 @@ class StageValidationExceptionTest extends PackageManagerKernelTestBase {
    *   The test cases.
    */
   public function providerResultsAsText(): array {
-    $messages = ['Blam!', 'Kapow!'];
+    $messages = ['Bang!', 'Pow!'];
     $summary = t('There was sadness.');
 
     $result_no_summary = ValidationResult::createError([$messages[0]]);
diff --git a/package_manager/tests/src/Unit/InstalledPackagesDataTest.php b/package_manager/tests/src/Unit/InstalledPackagesDataTest.php
index 606d2e2fa7395cb34f1086ba6ece45ceed2dac4d..eb4a859e7b4f9f3cfb3bb9a61dc43dc4c7594d9b 100644
--- a/package_manager/tests/src/Unit/InstalledPackagesDataTest.php
+++ b/package_manager/tests/src/Unit/InstalledPackagesDataTest.php
@@ -19,7 +19,7 @@ class InstalledPackagesDataTest extends UnitTestCase {
   /**
    * Tests that Composer's `installed.php` file looks how we expect.
    */
-  public function testinstalledPackagesData(): void {
+  public function testInstalledPackagesData(): void {
     $loaders = ClassLoader::getRegisteredLoaders();
     $installed_php = key($loaders) . '/composer/installed.php';
     $this->assertFileIsReadable($installed_php);
diff --git a/package_manager/tests/src/Unit/PathLocatorTest.php b/package_manager/tests/src/Unit/PathLocatorTest.php
index 1bcc0b8b1c680bde38baa7ec2d7d9b42ce9d195f..5f4157f284b96a45d36fdaa08f495a7102b4d467 100644
--- a/package_manager/tests/src/Unit/PathLocatorTest.php
+++ b/package_manager/tests/src/Unit/PathLocatorTest.php
@@ -20,7 +20,7 @@ class PathLocatorTest extends UnitTestCase {
   public function testStagingRoot(): void {
     $config_factory = $this->getConfigFactoryStub([
       'system.site' => [
-        'uuid' => 'my_site_id',
+        'uuid' => '_my_site_id',
       ],
     ]);
     $file_system = $this->prophesize(FileSystemInterface::class);
@@ -31,7 +31,7 @@ class PathLocatorTest extends UnitTestCase {
       $config_factory,
       $file_system->reveal()
     );
-    $this->assertSame('/path/to/temp/.package_managermy_site_id', $path_locator->getStagingRoot());
+    $this->assertSame('/path/to/temp/.package_manager_my_site_id', $path_locator->getStagingRoot());
   }
 
   /**
diff --git a/src/ReleaseChooser.php b/src/ReleaseChooser.php
index d620f181311a5fc20e0e90ca8bba3aa32db810df..5e819ce06416f539d39849927003fe9dff14b28c 100644
--- a/src/ReleaseChooser.php
+++ b/src/ReleaseChooser.php
@@ -47,7 +47,7 @@ final class ReleaseChooser {
    *   The updater that will be used to install the releases.
    *
    * @return \Drupal\update\ProjectRelease[]
-   *   The releases that are installable by the given updtaer, according to the
+   *   The releases that are installable by the given updater, according to the
    *   version validator service.
    */
   protected function getInstallableReleases(Updater $updater): array {
diff --git a/tests/fixtures/StagedProjectsValidatorTest/new_project_added/active/vendor/composer/installed.json b/tests/fixtures/StagedProjectsValidatorTest/new_project_added/active/vendor/composer/installed.json
index 1f6de85d0743b62ca29e259544fae6a9a76fcf38..651fd0e635da7349ab74ac502f3a4e53fc4a4c6c 100644
--- a/tests/fixtures/StagedProjectsValidatorTest/new_project_added/active/vendor/composer/installed.json
+++ b/tests/fixtures/StagedProjectsValidatorTest/new_project_added/active/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in the active directory of a virtual project.",
+    "This file simulates a list of packages installed in the active directory of a virtual project.",
     "It will be compared against staged.installed.json.",
     "See \\Drupal\\Tests\\automatic_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/tests/fixtures/StagedProjectsValidatorTest/new_project_added/staged/vendor/composer/installed.json b/tests/fixtures/StagedProjectsValidatorTest/new_project_added/staged/vendor/composer/installed.json
index b0bdf7c1a4d42b4dafe1c012d8d1d9f6c001f8c6..c7575498f1b5e61407437504b4d6e42ba6e4b711 100644
--- a/tests/fixtures/StagedProjectsValidatorTest/new_project_added/staged/vendor/composer/installed.json
+++ b/tests/fixtures/StagedProjectsValidatorTest/new_project_added/staged/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in a virtual staging area.",
+    "This file simulates a list of packages installed in a virtual staging area.",
     "It will be compared against active.installed.json.",
     "See \\Drupal\\Tests\\automatic_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/tests/fixtures/StagedProjectsValidatorTest/no_errors/active/vendor/composer/installed.json b/tests/fixtures/StagedProjectsValidatorTest/no_errors/active/vendor/composer/installed.json
index 6b93669c33273da234db2b07edcbfe077e032353..7f666647f8d774f3a2d0632925a408466aeefc4c 100644
--- a/tests/fixtures/StagedProjectsValidatorTest/no_errors/active/vendor/composer/installed.json
+++ b/tests/fixtures/StagedProjectsValidatorTest/no_errors/active/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in the active directory of a virtual project.",
+    "This file simulates a list of packages installed in the active directory of a virtual project.",
     "It will be compared against staged.installed.json.",
     "See \\Drupal\\Tests\\automatic_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/tests/fixtures/StagedProjectsValidatorTest/no_errors/staged/vendor/composer/installed.json b/tests/fixtures/StagedProjectsValidatorTest/no_errors/staged/vendor/composer/installed.json
index ee87bd5e9e0e835217bb7ca0d88faf93a539108a..a099177f821a64196ea66b2946f50221c1a7e843 100644
--- a/tests/fixtures/StagedProjectsValidatorTest/no_errors/staged/vendor/composer/installed.json
+++ b/tests/fixtures/StagedProjectsValidatorTest/no_errors/staged/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in a virtual staging area.",
+    "This file simulates a list of packages installed in a virtual staging area.",
     "It will be compared against active.installed.json.",
     "See \\Drupal\\Tests\\automatic_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/tests/fixtures/StagedProjectsValidatorTest/project_removed/active/vendor/composer/installed.json b/tests/fixtures/StagedProjectsValidatorTest/project_removed/active/vendor/composer/installed.json
index 6e2ecb6b9f0a51323cbee638f09f0bea61291ed2..f6153d31e544cd1ce1c901df6c1adc5a0d14407e 100644
--- a/tests/fixtures/StagedProjectsValidatorTest/project_removed/active/vendor/composer/installed.json
+++ b/tests/fixtures/StagedProjectsValidatorTest/project_removed/active/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in the active directory of a virtual project.",
+    "This file simulates a list of packages installed in the active directory of a virtual project.",
     "It will be compared against staged.installed.json.",
     "See \\Drupal\\Tests\\automatic_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/tests/fixtures/StagedProjectsValidatorTest/project_removed/staged/vendor/composer/installed.json b/tests/fixtures/StagedProjectsValidatorTest/project_removed/staged/vendor/composer/installed.json
index c44eb0104d91d63b28d8f5305429e3572ae7963c..603134a067b0dfe693b4fc70776c5b6ba60ced21 100644
--- a/tests/fixtures/StagedProjectsValidatorTest/project_removed/staged/vendor/composer/installed.json
+++ b/tests/fixtures/StagedProjectsValidatorTest/project_removed/staged/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in a virtual staging area.",
+    "This file simulates a list of packages installed in a virtual staging area.",
     "It will be compared against active.installed.json.",
     "See \\Drupal\\Tests\\automatic_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/tests/fixtures/StagedProjectsValidatorTest/version_changed/active/vendor/composer/installed.json b/tests/fixtures/StagedProjectsValidatorTest/version_changed/active/vendor/composer/installed.json
index cb7c3ca5eff5096a08d64ce17d008d8ee4fb3ed8..fc2e937eb7e96381eb5e46f9d01596cdb6f854cc 100644
--- a/tests/fixtures/StagedProjectsValidatorTest/version_changed/active/vendor/composer/installed.json
+++ b/tests/fixtures/StagedProjectsValidatorTest/version_changed/active/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in the active directory of a virtual project.",
+    "This file simulates a list of packages installed in the active directory of a virtual project.",
     "It will be compared against staged.installed.json.",
     "See \\Drupal\\Tests\\automatic_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/tests/fixtures/StagedProjectsValidatorTest/version_changed/staged/vendor/composer/installed.json b/tests/fixtures/StagedProjectsValidatorTest/version_changed/staged/vendor/composer/installed.json
index e457476acea77c727e783a19849526418f83865b..4b74a4d88caf9fde732945fd4e84ca6952229b7d 100644
--- a/tests/fixtures/StagedProjectsValidatorTest/version_changed/staged/vendor/composer/installed.json
+++ b/tests/fixtures/StagedProjectsValidatorTest/version_changed/staged/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in a virtual staging area.",
+    "This file simulates a list of packages installed in a virtual staging area.",
     "It will be compared against active.installed.json.",
     "See \\Drupal\\Tests\\automatic_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/tests/modules/automatic_updates_test/automatic_updates_test.module b/tests/modules/automatic_updates_test/automatic_updates_test.module
index 2aec23f2382601623f993738994d6c552625ffa7..9d8022ec5780dd91afcf2ed4a360d4f20d9b8cb6 100644
--- a/tests/modules/automatic_updates_test/automatic_updates_test.module
+++ b/tests/modules/automatic_updates_test/automatic_updates_test.module
@@ -14,7 +14,7 @@ function automatic_updates_test_mail_alter(array &$message): void {
   if (str_starts_with($message['id'], 'automatic_updates_')) {
     $line_langcodes = [];
 
-    // Get the langcode of every translated line in the mssage, including the
+    // Get the langcode of every translated line in the message, including the
     // subject line.
     $lines = array_merge($message['body'], [
       $message['subject'],
diff --git a/tests/src/Functional/UpdaterFormTest.php b/tests/src/Functional/UpdaterFormTest.php
index d0b976e9916131131d87ed3eadcc9f346f3522a7..0600764b72136f729a4ac305ef76ecc081bb1bed 100644
--- a/tests/src/Functional/UpdaterFormTest.php
+++ b/tests/src/Functional/UpdaterFormTest.php
@@ -332,7 +332,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     $this->checkForMetaRefresh();
     $this->assertUpdateStagedTimes(1);
 
-    Committer::setException(new \Exception('failed at commiter'));
+    Committer::setException(new \Exception('failed at committer'));
     $page->pressButton('Continue');
     $this->checkForMetaRefresh();
     $assert_session->pageTextContainsOnce('An error has occurred.');
diff --git a/tests/src/Kernel/ReadinessValidation/StagedProjectsValidatorTest.php b/tests/src/Kernel/ReadinessValidation/StagedProjectsValidatorTest.php
index eac85e7c2c4353372f4b3c22df4aab7e29d20ec6..94fd7fb524270bc57c0961f113b4c774f8a8e764 100644
--- a/tests/src/Kernel/ReadinessValidation/StagedProjectsValidatorTest.php
+++ b/tests/src/Kernel/ReadinessValidation/StagedProjectsValidatorTest.php
@@ -81,7 +81,7 @@ class StagedProjectsValidatorTest extends AutomaticUpdatesKernelTestBase {
    * Tests validation errors, or lack thereof.
    *
    * @param string $root_fixture_directory
-   *   A directory containing to fixtures sub direcotories, 'active' and
+   *   A directory containing to fixtures sub-directories, 'active' and
    *   'staged'.
    * @param string|null $expected_summary
    *   The expected error summary, or NULL if no errors are expected.