diff --git a/core/modules/system/tests/src/Functional/Module/InstallTest.php b/core/modules/system/tests/src/Functional/Module/InstallTest.php
deleted file mode 100644
index 151c7d831815dd7f7de2a726ad0eda69e9854891..0000000000000000000000000000000000000000
--- a/core/modules/system/tests/src/Functional/Module/InstallTest.php
+++ /dev/null
@@ -1,102 +0,0 @@
-<?php
-
-namespace Drupal\Tests\system\Functional\Module;
-
-use Drupal\Component\Render\FormattableMarkup;
-use Drupal\Core\Database\Database;
-use Drupal\Core\Extension\ExtensionNameLengthException;
-use Drupal\Tests\BrowserTestBase;
-
-/**
- * Tests the installation of modules.
- *
- * @group Module
- */
-class InstallTest extends BrowserTestBase {
-
- /**
- * Modules to enable.
- *
- * @var array
- */
- protected static $modules = ['module_test'];
-
- /**
- * {@inheritdoc}
- */
- protected $defaultTheme = 'stark';
-
- /**
- * Verify that module's schema can be used during module installation.
- */
- public function testGetSchemaAtInstallTime() {
- // @see module_test_install()
- $value = Database::getConnection()->select('module_test', 'mt')->fields('mt', ['data'])->execute()->fetchField();
- $this->assertSame('varchar', $value);
- }
-
- /**
- * Tests enabling User module once more.
- *
- * Regression: The installer might enable a module twice due to automatic
- * dependency resolution. A bug caused the stored weight for User module to
- * be an array.
- */
- public function testEnableUserTwice() {
- \Drupal::service('module_installer')->install(['user'], FALSE);
- $this->assertSame(0, $this->config('core.extension')->get('module.user'));
- }
-
- /**
- * Tests recorded schema versions of early installed modules in the installer.
- */
- public function testRequiredModuleSchemaVersions() {
- /** @var \Drupal\Core\Update\UpdateHookRegistry $update_registry */
- $update_registry = \Drupal::service('update.update_hook_registry');
- $version = $update_registry->getInstalledVersion('system');
- $this->assertGreaterThan(0, $version);
- $version = $update_registry->getInstalledVersion('user');
- $this->assertGreaterThan(0, $version);
-
- $post_update_key_value = \Drupal::keyValue('post_update');
- $existing_updates = $post_update_key_value->get('existing_updates', []);
- $this->assertContains('module_test_post_update_test', $existing_updates);
- }
-
- /**
- * Ensures that post update functions are removed on uninstall.
- */
- public function testUninstallPostUpdateFunctions() {
- \Drupal::service('module_installer')->uninstall(['module_test']);
-
- $post_update_key_value = \Drupal::keyValue('post_update');
- $existing_updates = $post_update_key_value->get('existing_updates', []);
- $this->assertNotContains('module_test_post_update_test', $existing_updates);
- }
-
- /**
- * Tests that an exception is thrown when a module name is too long.
- */
- public function testModuleNameLength() {
- $module_name = 'invalid_module_name_over_the_maximum_allowed_character_length';
- $message = new FormattableMarkup('Exception thrown when enabling module %name with a name length over the allowed maximum', ['%name' => $module_name]);
- try {
- $this->container->get('module_installer')->install([$module_name]);
- $this->fail($message);
- }
- catch (\Exception $e) {
- $this->assertInstanceOf(ExtensionNameLengthException::class, $e);
- }
-
- // Since for the UI, the submit callback uses FALSE, test that too.
- $message = new FormattableMarkup('Exception thrown when enabling as if via the UI the module %name with a name length over the allowed maximum', ['%name' => $module_name]);
- try {
- $this->container->get('module_installer')->install([$module_name], FALSE);
- $this->fail($message);
- }
- catch (\Exception $e) {
- $this->assertInstanceOf(ExtensionNameLengthException::class, $e);
- }
- }
-
-}
diff --git a/core/modules/system/tests/src/Kernel/Module/InstallTest.php b/core/modules/system/tests/src/Kernel/Module/InstallTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..c870c7daa5f9efbaf148973adaab8d82a829a60a
--- /dev/null
+++ b/core/modules/system/tests/src/Kernel/Module/InstallTest.php
@@ -0,0 +1,122 @@
+<?php
+
+namespace Drupal\Tests\system\Kernel\Module;
+
+use Drupal\Core\Extension\ExtensionNameLengthException;
+use Drupal\Core\Extension\ModuleInstallerInterface;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the installation of modules.
+ *
+ * @group Module
+ */
+class InstallTest extends KernelTestBase {
+
+ /**
+ * The module installer service.
+ */
+ protected ModuleInstallerInterface $moduleInstaller;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp(): void {
+ parent::setUp();
+
+ $this->moduleInstaller = $this->container->get('module_installer');
+ $this->moduleInstaller->install([
+ 'module_test',
+ 'system',
+ 'user',
+ ]);
+ }
+
+ /**
+ * Verify that drupal_get_schema() can be used during module installation.
+ */
+ public function testGetSchemaAtInstallTime(): void {
+ // @see module_test_install()
+ $database = $this->container->get('database');
+ $value = $database->select('module_test')
+ ->fields('module_test', ['data'])
+ ->execute()
+ ->fetchField();
+ $this->assertEquals('varchar', $value);
+ }
+
+ /**
+ * Tests enabling User module once more.
+ *
+ * Regression: The installer might enable a module twice due to automatic
+ * dependency resolution. A bug caused the stored weight for user.module to
+ * be an array.
+ */
+ public function testEnableUserTwice(): void {
+ $this->moduleInstaller->install(['user'], FALSE);
+ $this->assertSame(0, $this->config('core.extension')->get('module.user'));
+
+ // To avoid false positives, ensure that a module that does not exist does
+ // not return exactly zero.
+ $this->assertNotSame(0, $this->config('core.extension')
+ ->get('module.does_not_exist'));
+ }
+
+ /**
+ * Tests recorded schema versions of early installed modules in the installer.
+ */
+ public function testRequiredModuleSchemaVersions(): void {
+ /** @var \Drupal\Core\Update\UpdateHookRegistry $update_registry */
+ $update_registry = \Drupal::service('update.update_hook_registry');
+ $version = $update_registry->getInstalledVersion('system');
+ $this->assertGreaterThan(0, $version);
+ $version = $update_registry->getInstalledVersion('user');
+ $this->assertGreaterThan(0, $version);
+
+ $post_update_key_value = \Drupal::keyValue('post_update');
+ $existing_updates = $post_update_key_value->get('existing_updates', []);
+ $this->assertContains('module_test_post_update_test', $existing_updates);
+ }
+
+ /**
+ * Ensures that post update functions are removed on uninstallation.
+ */
+ public function testUninstallPostUpdateFunctions(): void {
+ // First, to avoid false positives, ensure that the post_update function
+ // exists while the module is still installed.
+ $post_update_key_value = $this->container->get('keyvalue')
+ ->get('post_update');
+ $existing_updates = $post_update_key_value->get('existing_updates', []);
+ $this->assertContains('module_test_post_update_test', $existing_updates);
+
+ // Uninstall the module.
+ $this->moduleInstaller->uninstall(['module_test']);
+
+ // Ensure the post update function is no longer listed.
+ $existing_updates = $post_update_key_value->get('existing_updates', []);
+ $this->assertNotContains('module_test_post_update_test', $existing_updates);
+ }
+
+ /**
+ * Tests that an exception is thrown when a module name is too long.
+ */
+ public function testModuleNameLength(): void {
+ $module_name = 'invalid_module_name_over_the_maximum_allowed_character_length';
+ $this->expectException(ExtensionNameLengthException::class);
+ $this->expectExceptionMessage("Module name 'invalid_module_name_over_the_maximum_allowed_character_length' is over the maximum allowed length of 50 characters");
+ $this->moduleInstaller->install([$module_name]);
+ }
+
+ /**
+ * Tests that an exception is thrown when a module name is too long.
+ *
+ * We do this without checking dependencies for the module to install.
+ */
+ public function testModuleNameLengthWithoutDependencyCheck(): void {
+ $module_name = 'invalid_module_name_over_the_maximum_allowed_character_length';
+ $this->expectException(ExtensionNameLengthException::class);
+ $this->expectExceptionMessage("Module name 'invalid_module_name_over_the_maximum_allowed_character_length' is over the maximum allowed length of 50 characters");
+ $this->moduleInstaller->install([$module_name], FALSE);
+ }
+
+}