class ConfigImporterTest

class ConfigImporterTest extends KernelTestBase {
    
    /**
     * The beginning of an import validation error.
     */
    const FAIL_MESSAGE = 'There were errors validating the config synchronization.';
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'config_test',
        'system',
        'config_import_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installConfig([
            'system',
            'config_test',
        ]);
        // Installing config_test's default configuration pollutes the global
        // variable being used for recording hook invocations by this test already,
        // so it has to be cleared out manually.
        unset($GLOBALS['hook_config_test']);
        $this->copyConfig($this->container
            ->get('config.storage'), $this->container
            ->get('config.storage.sync'));
    }
    
    /**
     * Tests omission of module APIs for bare configuration operations.
     */
    public function testNoImport() {
        $dynamic_name = 'config_test.dynamic.dotted.default';
        // Verify the default configuration values exist.
        $config = $this->config($dynamic_name);
        $this->assertSame('dotted.default', $config->get('id'));
        // Verify that a bare $this->config() does not involve module APIs.
        $this->assertFalse(isset($GLOBALS['hook_config_test']));
    }
    
    /**
     * Tests that trying to import from empty sync configuration directory fails.
     */
    public function testEmptyImportFails() {
        $this->expectException(ConfigImporterException::class);
        $this->container
            ->get('config.storage.sync')
            ->deleteAll();
        $this->configImporter()
            ->import();
    }
    
    /**
     * Tests verification of site UUID before importing configuration.
     */
    public function testSiteUuidValidate() {
        $sync = \Drupal::service('config.storage.sync');
        // Create updated configuration object.
        $config_data = $this->config('system.site')
            ->get();
        // Generate a new site UUID.
        $config_data['uuid'] = \Drupal::service('uuid')->generate();
        $sync->write('system.site', $config_data);
        $config_importer = $this->configImporter();
        try {
            $config_importer->import();
            $this->fail('ConfigImporterException not thrown, invalid import was not stopped due to mis-matching site UUID.');
        } catch (ConfigImporterException $e) {
            $actual_message = $e->getMessage();
            $actual_error_log = $config_importer->getErrors();
            $expected_error_log = [
                'Site UUID in source storage does not match the target storage.',
            ];
            $this->assertEquals($expected_error_log, $actual_error_log);
            $expected = static::FAIL_MESSAGE . PHP_EOL . 'Site UUID in source storage does not match the target storage.';
            $this->assertEquals($expected, $actual_message);
            foreach ($expected_error_log as $log_row) {
                $this->assertMatchesRegularExpression("/{$log_row}/", $actual_message);
            }
        }
    }
    
    /**
     * Tests deletion of configuration during import.
     */
    public function testDeleted() {
        $dynamic_name = 'config_test.dynamic.dotted.default';
        $storage = $this->container
            ->get('config.storage');
        $sync = $this->container
            ->get('config.storage.sync');
        // Verify the default configuration values exist.
        $config = $this->config($dynamic_name);
        $this->assertSame('dotted.default', $config->get('id'));
        // Delete the file from the sync directory.
        $sync->delete($dynamic_name);
        // Import.
        $config_importer = $this->configImporter();
        $config_importer->import();
        // Verify the file has been removed.
        $this->assertFalse($storage->read($dynamic_name));
        $config = $this->config($dynamic_name);
        $this->assertNull($config->get('id'));
        // Verify that appropriate module API hooks have been invoked.
        $this->assertTrue(isset($GLOBALS['hook_config_test']['load']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['presave']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['insert']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['update']));
        $this->assertTrue(isset($GLOBALS['hook_config_test']['predelete']));
        $this->assertTrue(isset($GLOBALS['hook_config_test']['delete']));
        $this->assertFalse($config_importer->hasUnprocessedConfigurationChanges());
        $logs = $config_importer->getErrors();
        $this->assertCount(0, $logs);
    }
    
    /**
     * Tests creation of configuration during import.
     */
    public function testNew() {
        $dynamic_name = 'config_test.dynamic.new';
        $storage = $this->container
            ->get('config.storage');
        $sync = $this->container
            ->get('config.storage.sync');
        // Verify the configuration to create does not exist yet.
        $this->assertFalse($storage->exists($dynamic_name), $dynamic_name . ' not found.');
        // Create new config entity.
        $original_dynamic_data = [
            'uuid' => '30df59bd-7b03-4cf7-bb35-d42fc49f0651',
            'langcode' => \Drupal::languageManager()->getDefaultLanguage()
                ->getId(),
            'status' => TRUE,
            'dependencies' => [],
            'id' => 'new',
            'label' => 'New',
            'weight' => 0,
            'style' => '',
            'size' => '',
            'size_value' => '',
            'protected_property' => '',
        ];
        $sync->write($dynamic_name, $original_dynamic_data);
        $this->assertTrue($sync->exists($dynamic_name), $dynamic_name . ' found.');
        // Import.
        $config_importer = $this->configImporter();
        $config_importer->import();
        // Verify the values appeared.
        $config = $this->config($dynamic_name);
        $this->assertSame($original_dynamic_data['label'], $config->get('label'));
        // Verify that appropriate module API hooks have been invoked.
        $this->assertFalse(isset($GLOBALS['hook_config_test']['load']));
        $this->assertTrue(isset($GLOBALS['hook_config_test']['presave']));
        $this->assertTrue(isset($GLOBALS['hook_config_test']['insert']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['update']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['predelete']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['delete']));
        // Verify that hook_config_import_steps_alter() can add steps to
        // configuration synchronization.
        $this->assertTrue(isset($GLOBALS['hook_config_test']['config_import_steps_alter']));
        // Verify that there is nothing more to import.
        $this->assertFalse($config_importer->hasUnprocessedConfigurationChanges());
        $logs = $config_importer->getErrors();
        $this->assertCount(0, $logs);
    }
    
    /**
     * Tests that secondary writes are overwritten.
     */
    public function testSecondaryWritePrimaryFirst() {
        $name_primary = 'config_test.dynamic.primary';
        $name_secondary = 'config_test.dynamic.secondary';
        $sync = $this->container
            ->get('config.storage.sync');
        $uuid = $this->container
            ->get('uuid');
        $values_primary = [
            'id' => 'primary',
            'label' => 'Primary',
            'weight' => 0,
            'uuid' => $uuid->generate(),
        ];
        $sync->write($name_primary, $values_primary);
        $values_secondary = [
            'id' => 'secondary',
            'label' => 'Secondary Sync',
            'weight' => 0,
            'uuid' => $uuid->generate(),
            // Add a dependency on primary, to ensure that is synced first.
'dependencies' => [
                'config' => [
                    $name_primary,
                ],
            ],
        ];
        $sync->write($name_secondary, $values_secondary);
        // Import.
        $config_importer = $this->configImporter();
        $config_importer->import();
        $entity_storage = \Drupal::entityTypeManager()->getStorage('config_test');
        $primary = $entity_storage->load('primary');
        $this->assertEquals('primary', $primary->id());
        $this->assertEquals($values_primary['uuid'], $primary->uuid());
        $this->assertEquals($values_primary['label'], $primary->label());
        $secondary = $entity_storage->load('secondary');
        $this->assertEquals('secondary', $secondary->id());
        $this->assertEquals($values_secondary['uuid'], $secondary->uuid());
        $this->assertEquals($values_secondary['label'], $secondary->label());
        $logs = $config_importer->getErrors();
        $this->assertCount(1, $logs);
        $this->assertEquals(new FormattableMarkup('Deleted and replaced configuration entity "@name"', [
            '@name' => $name_secondary,
        ]), $logs[0]);
    }
    
    /**
     * Tests that secondary writes are overwritten.
     */
    public function testSecondaryWriteSecondaryFirst() {
        $name_primary = 'config_test.dynamic.primary';
        $name_secondary = 'config_test.dynamic.secondary';
        $sync = $this->container
            ->get('config.storage.sync');
        $uuid = $this->container
            ->get('uuid');
        $values_primary = [
            'id' => 'primary',
            'label' => 'Primary',
            'weight' => 0,
            'uuid' => $uuid->generate(),
            // Add a dependency on secondary, so that is synced first.
'dependencies' => [
                'config' => [
                    $name_secondary,
                ],
            ],
        ];
        $sync->write($name_primary, $values_primary);
        $values_secondary = [
            'id' => 'secondary',
            'label' => 'Secondary Sync',
            'weight' => 0,
            'uuid' => $uuid->generate(),
        ];
        $sync->write($name_secondary, $values_secondary);
        // Import.
        $config_importer = $this->configImporter();
        $config_importer->import();
        $entity_storage = \Drupal::entityTypeManager()->getStorage('config_test');
        $primary = $entity_storage->load('primary');
        $this->assertEquals('primary', $primary->id());
        $this->assertEquals($values_primary['uuid'], $primary->uuid());
        $this->assertEquals($values_primary['label'], $primary->label());
        $secondary = $entity_storage->load('secondary');
        $this->assertEquals('secondary', $secondary->id());
        $this->assertEquals($values_secondary['uuid'], $secondary->uuid());
        $this->assertEquals($values_secondary['label'], $secondary->label());
        $logs = $config_importer->getErrors();
        $this->assertCount(1, $logs);
        $this->assertEquals(Html::escape("Unexpected error during import with operation create for {$name_primary}: 'config_test' entity with ID 'secondary' already exists."), $logs[0]);
    }
    
    /**
     * Tests that secondary updates for deleted files work as expected.
     */
    public function testSecondaryUpdateDeletedDeleterFirst() {
        $name_deleter = 'config_test.dynamic.deleter';
        $name_deletee = 'config_test.dynamic.deletee';
        $name_other = 'config_test.dynamic.other';
        $storage = $this->container
            ->get('config.storage');
        $sync = $this->container
            ->get('config.storage.sync');
        $uuid = $this->container
            ->get('uuid');
        $values_deleter = [
            'id' => 'deleter',
            'label' => 'Deleter',
            'weight' => 0,
            'uuid' => $uuid->generate(),
        ];
        $storage->write($name_deleter, $values_deleter);
        $values_deleter['label'] = 'Updated Deleter';
        $sync->write($name_deleter, $values_deleter);
        $values_deletee = [
            'id' => 'deletee',
            'label' => 'Deletee',
            'weight' => 0,
            'uuid' => $uuid->generate(),
            // Add a dependency on deleter, to make sure that is synced first.
'dependencies' => [
                'config' => [
                    $name_deleter,
                ],
            ],
        ];
        $storage->write($name_deletee, $values_deletee);
        $values_deletee['label'] = 'Updated Deletee';
        $sync->write($name_deletee, $values_deletee);
        // Ensure that import will continue after the error.
        $values_other = [
            'id' => 'other',
            'label' => 'Other',
            'weight' => 0,
            'uuid' => $uuid->generate(),
            // Add a dependency on deleter, to make sure that is synced first. This
            // will also be synced after the deletee due to alphabetical ordering.
'dependencies' => [
                'config' => [
                    $name_deleter,
                ],
            ],
        ];
        $storage->write($name_other, $values_other);
        $values_other['label'] = 'Updated other';
        $sync->write($name_other, $values_other);
        // Check update changelist order.
        $config_importer = $this->configImporter();
        $updates = $config_importer->getStorageComparer()
            ->getChangelist('update');
        $expected = [
            $name_deleter,
            $name_deletee,
            $name_other,
        ];
        $this->assertSame($expected, $updates);
        // Import.
        $config_importer->import();
        $entity_storage = \Drupal::entityTypeManager()->getStorage('config_test');
        $deleter = $entity_storage->load('deleter');
        $this->assertEquals('deleter', $deleter->id());
        $this->assertEquals($values_deleter['uuid'], $deleter->uuid());
        $this->assertEquals($values_deleter['label'], $deleter->label());
        // The deletee was deleted in
        // \Drupal\config_test\Entity\ConfigTest::postSave().
        $this->assertNull($entity_storage->load('deletee'));
        $other = $entity_storage->load('other');
        $this->assertEquals('other', $other->id());
        $this->assertEquals($values_other['uuid'], $other->uuid());
        $this->assertEquals($values_other['label'], $other->label());
        $logs = $config_importer->getErrors();
        $this->assertCount(1, $logs);
        $this->assertEquals(new FormattableMarkup('Update target "@name" is missing.', [
            '@name' => $name_deletee,
        ]), $logs[0]);
    }
    
    /**
     * Tests that secondary updates for deleted files work as expected.
     *
     * This test is completely hypothetical since we only support full
     * configuration tree imports. Therefore, any configuration updates that cause
     * secondary deletes should be reflected already in the staged configuration.
     */
    public function testSecondaryUpdateDeletedDeleteeFirst() {
        $name_deleter = 'config_test.dynamic.deleter';
        $name_deletee = 'config_test.dynamic.deletee';
        $storage = $this->container
            ->get('config.storage');
        $sync = $this->container
            ->get('config.storage.sync');
        $uuid = $this->container
            ->get('uuid');
        $values_deleter = [
            'id' => 'deleter',
            'label' => 'Deleter',
            'weight' => 0,
            'uuid' => $uuid->generate(),
            // Add a dependency on deletee, to make sure that is synced first.
'dependencies' => [
                'config' => [
                    $name_deletee,
                ],
            ],
        ];
        $storage->write($name_deleter, $values_deleter);
        $values_deleter['label'] = 'Updated Deleter';
        $sync->write($name_deleter, $values_deleter);
        $values_deletee = [
            'id' => 'deletee',
            'label' => 'Deletee',
            'weight' => 0,
            'uuid' => $uuid->generate(),
        ];
        $storage->write($name_deletee, $values_deletee);
        $values_deletee['label'] = 'Updated Deletee';
        $sync->write($name_deletee, $values_deletee);
        // Import.
        $config_importer = $this->configImporter();
        $config_importer->import();
        $entity_storage = \Drupal::entityTypeManager()->getStorage('config_test');
        // Both entities are deleted. ConfigTest::postSave() causes updates of the
        // deleter entity to delete the deletee entity. Since the deleter depends on
        // the deletee, removing the deletee causes the deleter to be removed.
        $this->assertNull($entity_storage->load('deleter'));
        $this->assertNull($entity_storage->load('deletee'));
        $logs = $config_importer->getErrors();
        $this->assertCount(0, $logs);
    }
    
    /**
     * Tests that secondary deletes for deleted files work as expected.
     */
    public function testSecondaryDeletedDeleteeSecond() {
        $name_deleter = 'config_test.dynamic.deleter';
        $name_deletee = 'config_test.dynamic.deletee';
        $storage = $this->container
            ->get('config.storage');
        $uuid = $this->container
            ->get('uuid');
        $values_deleter = [
            'id' => 'deleter',
            'label' => 'Deleter',
            'weight' => 0,
            'uuid' => $uuid->generate(),
            // Add a dependency on deletee, to make sure this delete is synced first.
'dependencies' => [
                'config' => [
                    $name_deletee,
                ],
            ],
        ];
        $storage->write($name_deleter, $values_deleter);
        $values_deletee = [
            'id' => 'deletee',
            'label' => 'Deletee',
            'weight' => 0,
            'uuid' => $uuid->generate(),
        ];
        $storage->write($name_deletee, $values_deletee);
        // Import.
        $config_importer = $this->configImporter();
        $config_importer->import();
        $entity_storage = \Drupal::entityTypeManager()->getStorage('config_test');
        $this->assertNull($entity_storage->load('deleter'));
        $this->assertNull($entity_storage->load('deletee'));
        // The deletee entity does not exist as the delete worked and although the
        // delete occurred in \Drupal\config_test\Entity\ConfigTest::postDelete()
        // this does not matter.
        $logs = $config_importer->getErrors();
        $this->assertCount(0, $logs);
    }
    
    /**
     * Tests updating of configuration during import.
     */
    public function testUpdated() {
        $name = 'config_test.system';
        $dynamic_name = 'config_test.dynamic.dotted.default';
        $storage = $this->container
            ->get('config.storage');
        $sync = $this->container
            ->get('config.storage.sync');
        // Verify that the configuration objects to import exist.
        $this->assertTrue($storage->exists($name), $name . ' found.');
        $this->assertTrue($storage->exists($dynamic_name), $dynamic_name . ' found.');
        // Replace the file content of the existing configuration objects in the
        // sync directory.
        $original_name_data = [
            'foo' => 'beer',
        ];
        $sync->write($name, $original_name_data);
        $original_dynamic_data = $storage->read($dynamic_name);
        $original_dynamic_data['label'] = 'Updated';
        $sync->write($dynamic_name, $original_dynamic_data);
        // Verify the active configuration still returns the default values.
        $config = $this->config($name);
        $this->assertSame('bar', $config->get('foo'));
        $config = $this->config($dynamic_name);
        $this->assertSame('Default', $config->get('label'));
        // Import.
        $config_importer = $this->configImporter();
        $config_importer->import();
        // Verify the values were updated.
        \Drupal::configFactory()->reset($name);
        $config = $this->config($name);
        $this->assertSame('beer', $config->get('foo'));
        $config = $this->config($dynamic_name);
        $this->assertSame('Updated', $config->get('label'));
        // Verify that the original file content is still the same.
        $this->assertSame($original_name_data, $sync->read($name));
        $this->assertSame($original_dynamic_data, $sync->read($dynamic_name));
        // Verify that appropriate module API hooks have been invoked.
        $this->assertTrue(isset($GLOBALS['hook_config_test']['load']));
        $this->assertTrue(isset($GLOBALS['hook_config_test']['presave']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['insert']));
        $this->assertTrue(isset($GLOBALS['hook_config_test']['update']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['predelete']));
        $this->assertFalse(isset($GLOBALS['hook_config_test']['delete']));
        // Verify that there is nothing more to import.
        $this->assertFalse($config_importer->hasUnprocessedConfigurationChanges());
        $logs = $config_importer->getErrors();
        $this->assertCount(0, $logs);
    }
    
    /**
     * Tests the isInstallable method()
     */
    public function testIsInstallable() {
        $config_name = 'config_test.dynamic.isinstallable';
        $this->assertFalse($this->container
            ->get('config.storage')
            ->exists($config_name));
        \Drupal::state()->set('config_test.isinstallable', TRUE);
        $this->installConfig([
            'config_test',
        ]);
        $this->assertTrue($this->container
            ->get('config.storage')
            ->exists($config_name));
    }
    
    /**
     * Tests dependency validation during configuration import.
     *
     * @see \Drupal\Core\EventSubscriber\ConfigImportSubscriber
     * @see \Drupal\Core\Config\ConfigImporter::createExtensionChangelist()
     */
    public function testUnmetDependency() {
        $storage = $this->container
            ->get('config.storage');
        $sync = $this->container
            ->get('config.storage.sync');
        // Test an unknown configuration owner.
        $sync->write('unknown.config', [
            'test' => 'test',
        ]);
        // Make a config entity have unmet dependencies.
        $config_entity_data = $sync->read('config_test.dynamic.dotted.default');
        $config_entity_data['dependencies'] = [
            'module' => [
                'unknown',
            ],
        ];
        $sync->write('config_test.dynamic.dotted.module', $config_entity_data);
        $config_entity_data['dependencies'] = [
            'theme' => [
                'unknown',
            ],
        ];
        $sync->write('config_test.dynamic.dotted.theme', $config_entity_data);
        $config_entity_data['dependencies'] = [
            'config' => [
                'unknown',
            ],
        ];
        $sync->write('config_test.dynamic.dotted.config', $config_entity_data);
        // Make an active config depend on something that is missing in sync.
        // The whole configuration needs to be consistent, not only the updated one.
        $config_entity_data['dependencies'] = [];
        $storage->write('config_test.dynamic.dotted.deleted', $config_entity_data);
        $config_entity_data['dependencies'] = [
            'config' => [
                'config_test.dynamic.dotted.deleted',
            ],
        ];
        $storage->write('config_test.dynamic.dotted.existing', $config_entity_data);
        $sync->write('config_test.dynamic.dotted.existing', $config_entity_data);
        $extensions = $sync->read('core.extension');
        // Add a module and a theme that do not exist.
        $extensions['module']['unknown_module'] = 0;
        $extensions['theme']['unknown_theme'] = 0;
        // Add a module and a theme that depend on uninstalled extensions.
        $extensions['module']['book'] = 0;
        $extensions['theme']['test_subtheme'] = 0;
        $sync->write('core.extension', $extensions);
        $config_importer = $this->configImporter();
        try {
            $config_importer->import();
            $this->fail('ConfigImporterException not thrown; an invalid import was not stopped due to missing dependencies.');
        } catch (ConfigImporterException $e) {
            $expected = [
                static::FAIL_MESSAGE,
                'Unable to install the <em class="placeholder">unknown_module</em> module since it does not exist.',
                'Unable to install the <em class="placeholder">Book</em> module since it requires the <em class="placeholder">Node, Text, Field, Filter, User</em> modules.',
                'Unable to install the <em class="placeholder">unknown_theme</em> theme since it does not exist.',
                'Unable to install the <em class="placeholder">Theme test subtheme</em> theme since it requires the <em class="placeholder">Theme test base theme</em> theme.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.config</em> depends on the <em class="placeholder">unknown</em> configuration that will not exist after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.existing</em> depends on the <em class="placeholder">config_test.dynamic.dotted.deleted</em> configuration that will not exist after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.module</em> depends on the <em class="placeholder">unknown</em> module that will not be installed after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.theme</em> depends on the <em class="placeholder">unknown</em> theme that will not be installed after import.',
                'Configuration <em class="placeholder">unknown.config</em> depends on the <em class="placeholder">unknown</em> extension that will not be installed after import.',
            ];
            $this->assertEquals(implode(PHP_EOL, $expected), $e->getMessage());
            $error_log = $config_importer->getErrors();
            $expected = [
                'Unable to install the <em class="placeholder">unknown_module</em> module since it does not exist.',
                'Unable to install the <em class="placeholder">Book</em> module since it requires the <em class="placeholder">Node, Text, Field, Filter, User</em> modules.',
                'Unable to install the <em class="placeholder">unknown_theme</em> theme since it does not exist.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.config</em> depends on the <em class="placeholder">unknown</em> configuration that will not exist after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.existing</em> depends on the <em class="placeholder">config_test.dynamic.dotted.deleted</em> configuration that will not exist after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.module</em> depends on the <em class="placeholder">unknown</em> module that will not be installed after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.theme</em> depends on the <em class="placeholder">unknown</em> theme that will not be installed after import.',
                'Configuration <em class="placeholder">unknown.config</em> depends on the <em class="placeholder">unknown</em> extension that will not be installed after import.',
            ];
            foreach ($expected as $expected_message) {
                $this->assertContainsEquals($expected_message, $error_log, $expected_message);
            }
        }
        // Make a config entity have multiple unmet dependencies.
        $config_entity_data = $sync->read('config_test.dynamic.dotted.default');
        $config_entity_data['dependencies'] = [
            'module' => [
                'unknown',
                'dblog',
            ],
        ];
        $sync->write('config_test.dynamic.dotted.module', $config_entity_data);
        $config_entity_data['dependencies'] = [
            'theme' => [
                'unknown',
                'stark',
            ],
        ];
        $sync->write('config_test.dynamic.dotted.theme', $config_entity_data);
        $config_entity_data['dependencies'] = [
            'config' => [
                'unknown',
                'unknown2',
            ],
        ];
        $sync->write('config_test.dynamic.dotted.config', $config_entity_data);
        $config_importer = $this->configImporter();
        try {
            $this->configImporter
                ->import();
            $this->fail('ConfigImporterException not thrown, invalid import was not stopped due to missing dependencies.');
        } catch (ConfigImporterException $e) {
            $expected = [
                static::FAIL_MESSAGE,
                'Unable to install the <em class="placeholder">unknown_module</em> module since it does not exist.',
                'Unable to install the <em class="placeholder">Book</em> module since it requires the <em class="placeholder">Node, Text, Field, Filter, User</em> modules.',
                'Unable to install the <em class="placeholder">unknown_theme</em> theme since it does not exist.',
                'Unable to install the <em class="placeholder">Theme test subtheme</em> theme since it requires the <em class="placeholder">Theme test base theme</em> theme.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.config</em> depends on configuration (<em class="placeholder">unknown, unknown2</em>) that will not exist after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.existing</em> depends on the <em class="placeholder">config_test.dynamic.dotted.deleted</em> configuration that will not exist after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.module</em> depends on modules (<em class="placeholder">unknown, Database Logging</em>) that will not be installed after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.theme</em> depends on themes (<em class="placeholder">unknown, Stark</em>) that will not be installed after import.',
                'Configuration <em class="placeholder">unknown.config</em> depends on the <em class="placeholder">unknown</em> extension that will not be installed after import.',
            ];
            $this->assertEquals(implode(PHP_EOL, $expected), $e->getMessage());
            $error_log = $config_importer->getErrors();
            $expected = [
                'Configuration <em class="placeholder">config_test.dynamic.dotted.config</em> depends on configuration (<em class="placeholder">unknown, unknown2</em>) that will not exist after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.module</em> depends on modules (<em class="placeholder">unknown, Database Logging</em>) that will not be installed after import.',
                'Configuration <em class="placeholder">config_test.dynamic.dotted.theme</em> depends on themes (<em class="placeholder">unknown, Stark</em>) that will not be installed after import.',
            ];
            foreach ($expected as $expected_message) {
                $this->assertContainsEquals($expected_message, $error_log, $expected_message);
            }
        }
    }
    
    /**
     * Tests missing core.extension during configuration import.
     *
     * @see \Drupal\Core\EventSubscriber\ConfigImportSubscriber
     */
    public function testMissingCoreExtension() {
        $sync = $this->container
            ->get('config.storage.sync');
        $sync->delete('core.extension');
        $config_importer = $this->configImporter();
        try {
            $config_importer->import();
            $this->fail('ConfigImporterException not thrown, invalid import was not stopped due to missing dependencies.');
        } catch (ConfigImporterException $e) {
            $expected = static::FAIL_MESSAGE . PHP_EOL . 'The core.extension configuration does not exist.';
            $this->assertEquals($expected, $e->getMessage());
            $error_log = $config_importer->getErrors();
            $this->assertEquals([
                'The core.extension configuration does not exist.',
            ], $error_log);
        }
    }
    
    /**
     * Tests uninstall validators being called during synchronization.
     *
     * @see \Drupal\Core\EventSubscriber\ConfigImportSubscriber
     */
    public function testRequiredModuleValidation() {
        $sync = $this->container
            ->get('config.storage.sync');
        $extensions = $sync->read('core.extension');
        unset($extensions['module']['system']);
        $sync->write('core.extension', $extensions);
        $config_importer = $this->configImporter();
        try {
            $config_importer->import();
            $this->fail('ConfigImporterException not thrown, invalid import was not stopped due to missing dependencies.');
        } catch (ConfigImporterException $e) {
            $this->assertStringContainsString('There were errors validating the config synchronization.', $e->getMessage());
            $error_log = $config_importer->getErrors();
            $this->assertEquals('Unable to uninstall the <em class="placeholder">System</em> module because: The System module is required.', $error_log[0]);
        }
    }
    
    /**
     * Tests installing a base themes and sub themes during configuration import.
     *
     * @see \Drupal\Core\EventSubscriber\ConfigImportSubscriber
     */
    public function testInstallBaseAndSubThemes() {
        $sync = $this->container
            ->get('config.storage.sync');
        $extensions = $sync->read('core.extension');
        $extensions['theme']['test_basetheme'] = 0;
        $extensions['theme']['test_subtheme'] = 0;
        $extensions['theme']['test_subsubtheme'] = 0;
        $sync->write('core.extension', $extensions);
        $config_importer = $this->configImporter();
        $config_importer->import();
        $this->assertTrue($this->container
            ->get('theme_handler')
            ->themeExists('test_basetheme'));
        $this->assertTrue($this->container
            ->get('theme_handler')
            ->themeExists('test_subsubtheme'));
        $this->assertTrue($this->container
            ->get('theme_handler')
            ->themeExists('test_subtheme'));
        // Test uninstalling them.
        $extensions = $sync->read('core.extension');
        unset($extensions['theme']['test_basetheme']);
        unset($extensions['theme']['test_subsubtheme']);
        unset($extensions['theme']['test_subtheme']);
        $sync->write('core.extension', $extensions);
        $config_importer = $this->configImporter();
        $config_importer->import();
        $this->assertFalse($this->container
            ->get('theme_handler')
            ->themeExists('test_basetheme'));
        $this->assertFalse($this->container
            ->get('theme_handler')
            ->themeExists('test_subsubtheme'));
        $this->assertFalse($this->container
            ->get('theme_handler')
            ->themeExists('test_subtheme'));
    }
    
    /**
     * Tests install profile validation during configuration import.
     *
     * @see \Drupal\Core\EventSubscriber\ConfigImportSubscriber
     */
    public function testInstallProfile() {
        $sync = $this->container
            ->get('config.storage.sync');
        $extensions = $sync->read('core.extension');
        // Add an install profile.
        $extensions['module']['standard'] = 0;
        $sync->write('core.extension', $extensions);
        $config_importer = $this->configImporter();
        try {
            $config_importer->import();
            $this->fail('ConfigImporterException not thrown; an invalid import was not stopped due to missing dependencies.');
        } catch (ConfigImporterException $e) {
            $expected = static::FAIL_MESSAGE . PHP_EOL . 'Unable to install the <em class="placeholder">standard</em> module since it does not exist.';
            $this->assertEquals($expected, $e->getMessage(), 'There were errors validating the config synchronization.');
            $error_log = $config_importer->getErrors();
            // Install profiles should not even be scanned at this point.
            $this->assertEquals([
                'Unable to install the <em class="placeholder">standard</em> module since it does not exist.',
            ], $error_log);
        }
    }
    
    /**
     * Tests install profile validation during configuration import.
     *
     * @see \Drupal\Core\EventSubscriber\ConfigImportSubscriber
     */
    public function testInstallProfileMisMatch() {
        $sync = $this->container
            ->get('config.storage.sync');
        $extensions = $sync->read('core.extension');
        // Change the install profile.
        $extensions['profile'] = 'this_will_not_work';
        $sync->write('core.extension', $extensions);
        $config_importer = $this->configImporter();
        try {
            $config_importer->import();
            $this->fail('ConfigImporterException not thrown; an invalid import was not stopped due to missing dependencies.');
        } catch (ConfigImporterException $e) {
            $expected = static::FAIL_MESSAGE . PHP_EOL . 'Cannot change the install profile from <em class="placeholder"></em> to <em class="placeholder">this_will_not_work</em> once Drupal is installed.';
            $this->assertEquals($expected, $e->getMessage(), 'There were errors validating the config synchronization.');
            $error_log = $config_importer->getErrors();
            // Install profiles can not be changed. Note that KernelTestBase currently
            // does not use an install profile. This situation should be impossible
            // to get in but site's can removed the install profile setting from
            // settings.php so the test is valid.
            $this->assertEquals([
                'Cannot change the install profile from <em class="placeholder"></em> to <em class="placeholder">this_will_not_work</em> once Drupal is installed.',
            ], $error_log);
        }
    }
    
    /**
     * Tests the isSyncing flags.
     */
    public function testIsSyncingInHooks() {
        $dynamic_name = 'config_test.dynamic.dotted.default';
        $storage = $this->container
            ->get('config.storage');
        // Verify the default configuration values exist.
        $config = $this->config($dynamic_name);
        $this->assertSame('dotted.default', $config->get('id'));
        // Delete the config so that create hooks will fire.
        $storage->delete($dynamic_name);
        \Drupal::state()->set('config_test.store_isSyncing', []);
        $this->configImporter()
            ->import();
        // The values of the syncing values should be stored in state by
        // config_test_config_test_create().
        $state = \Drupal::state()->get('config_test.store_isSyncing');
        $this->assertTrue($state['global_state::create'], '\\Drupal::isConfigSyncing() returns TRUE');
        $this->assertTrue($state['entity_state::create'], 'ConfigEntity::isSyncing() returns TRUE');
        $this->assertTrue($state['global_state::presave'], '\\Drupal::isConfigSyncing() returns TRUE');
        $this->assertTrue($state['entity_state::presave'], 'ConfigEntity::isSyncing() returns TRUE');
        $this->assertTrue($state['global_state::insert'], '\\Drupal::isConfigSyncing() returns TRUE');
        $this->assertTrue($state['entity_state::insert'], 'ConfigEntity::isSyncing() returns TRUE');
        // Cause a config update so update hooks will fire.
        $config = $this->config($dynamic_name);
        $config->set('label', 'A new name')
            ->save();
        \Drupal::state()->set('config_test.store_isSyncing', []);
        $this->configImporter()
            ->import();
        // The values of the syncing values should be stored in state by
        // config_test_config_test_create().
        $state = \Drupal::state()->get('config_test.store_isSyncing');
        $this->assertTrue($state['global_state::presave'], '\\Drupal::isConfigSyncing() returns TRUE');
        $this->assertTrue($state['entity_state::presave'], 'ConfigEntity::isSyncing() returns TRUE');
        $this->assertTrue($state['global_state::update'], '\\Drupal::isConfigSyncing() returns TRUE');
        $this->assertTrue($state['entity_state::update'], 'ConfigEntity::isSyncing() returns TRUE');
        // Cause a config delete so delete hooks will fire.
        $sync = $this->container
            ->get('config.storage.sync');
        $sync->delete($dynamic_name);
        \Drupal::state()->set('config_test.store_isSyncing', []);
        $this->configImporter()
            ->import();
        // The values of the syncing values should be stored in state by
        // config_test_config_test_create().
        $state = \Drupal::state()->get('config_test.store_isSyncing');
        $this->assertTrue($state['global_state::predelete'], '\\Drupal::isConfigSyncing() returns TRUE');
        $this->assertTrue($state['entity_state::predelete'], 'ConfigEntity::isSyncing() returns TRUE');
        $this->assertTrue($state['global_state::delete'], '\\Drupal::isConfigSyncing() returns TRUE');
        $this->assertTrue($state['entity_state::delete'], 'ConfigEntity::isSyncing() returns TRUE');
    }
    
    /**
     * Tests that the isConfigSyncing flag is cleanup after an invalid step.
     */
    public function testInvalidStep() {
        $this->assertFalse(\Drupal::isConfigSyncing(), 'Before an import \\Drupal::isConfigSyncing() returns FALSE');
        $context = [];
        $config_importer = $this->configImporter();
        try {
            $config_importer->doSyncStep('a_non_existent_step', $context);
            $this->fail('Expected \\InvalidArgumentException thrown');
        } catch (\InvalidArgumentException $e) {
            // Expected exception; just continue testing.
        }
        $this->assertFalse(\Drupal::isConfigSyncing(), 'After an invalid step \\Drupal::isConfigSyncing() returns FALSE');
    }
    
    /**
     * Tests that the isConfigSyncing flag is set correctly during a custom step.
     */
    public function testCustomStep() {
        $this->assertFalse(\Drupal::isConfigSyncing(), 'Before an import \\Drupal::isConfigSyncing() returns FALSE');
        $context = [];
        $this->configImporter()
            ->doSyncStep(\Closure::fromCallable([
            self::class,
            'customStep',
        ]), $context);
        $this->assertTrue($context['is_syncing'], 'Inside a custom step \\Drupal::isConfigSyncing() returns TRUE');
        $this->assertFalse(\Drupal::isConfigSyncing(), 'After an valid custom step \\Drupal::isConfigSyncing() returns FALSE');
    }
    
    /**
     * Tests that uninstall a theme in config import correctly imports all config.
     */
    public function testUninstallThemeIncrementsCount() : void {
        $theme_installer = $this->container
            ->get('theme_installer');
        // Install our theme.
        $theme = 'test_basetheme';
        $theme_installer->install([
            $theme,
        ]);
        $this->assertTrue($this->container
            ->get('theme_handler')
            ->themeExists($theme));
        $sync = $this->container
            ->get('config.storage.sync');
        // Update 2 pieces of config in sync.
        $systemSiteName = 'system.site';
        $system = $sync->read($systemSiteName);
        $system['name'] = 'Foo';
        $sync->write($systemSiteName, $system);
        $cronName = 'system.cron';
        $cron = $sync->read($cronName);
        $this->assertEquals(1, $cron['logging']);
        $cron['logging'] = 0;
        $sync->write($cronName, $cron);
        // Uninstall the theme in sync.
        $extensions = $sync->read('core.extension');
        unset($extensions['theme'][$theme]);
        $sync->write('core.extension', $extensions);
        $this->configImporter()
            ->import();
        // The theme should be uninstalled.
        $this->assertFalse($this->container
            ->get('theme_handler')
            ->themeExists($theme));
        // Both pieces of config should be updated.
        \Drupal::configFactory()->reset($systemSiteName);
        \Drupal::configFactory()->reset($cronName);
        $this->assertEquals('Foo', $this->config($systemSiteName)
            ->get('name'));
        $this->assertEquals(0, $this->config($cronName)
            ->get('logging'));
    }
    
    /**
     * Helper method to test custom config installer steps.
     *
     * @param array $context
     *   Batch context.
     * @param \Drupal\Core\Config\ConfigImporter $importer
     *   The config importer.
     */
    public static function customStep(array &$context, ConfigImporter $importer) {
        $context['is_syncing'] = \Drupal::isConfigSyncing();
    }

}