Add test for hook implementation

config_ignore.module

@@ -60,7 +60,7 @@ function config_ignore_form_config_admin_import_form_alter(&$form, FormStateInte
     $form['ignored'] = [
       '#type' => 'table',
       '#header' => ['Config name', 'Action'],
-      '#caption' => t('The following configuration entities are ignored due to the <a href="@url">Config Ignore Settings</a> and therefore not displayed in the list above', [
+      '#caption' => t('<h3>The following configuration entities are ignored due to the <a href="@url">Config Ignore Settings</a> and therefore not displayed in the list above</h3>', [
         '@url' => Url::fromRoute('config_ignore.settings')
           ->toString()
       ]),

tests/src/Functional/ConfigIgnoreBrowserTestBase.php

+<?php
+
+namespace Drupal\Tests\config_ignore\Functional;
+
+use Drupal\Core\Config\ConfigImporter;
+use Drupal\Core\Config\FileStorage;
+use Drupal\Core\Config\StorageComparer;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Class ConfigIgnoreBrowserTestBase.
+ *
+ * @package Drupal\Tests\config_ignore
+ */
+abstract class ConfigIgnoreBrowserTestBase extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['config_ignore', 'config', 'config_filter'];
+
+  /**
+   * Config Importer object used for testing.
+   *
+   * @var \Drupal\Core\Config\ConfigImporter
+   */
+  protected $configImporter;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    // Set up the ConfigImporter object for testing.
+    $storage_comparer = new StorageComparer(
+      $this->container->get('config.storage.sync'),
+      $this->container->get('config.storage'),
+      $this->container->get('config.manager')
+    );
+    $this->configImporter = new ConfigImporter(
+      $storage_comparer->createChangelist(),
+      $this->container->get('event_dispatcher'),
+      $this->container->get('config.manager'),
+      $this->container->get('lock'),
+      $this->container->get('config.typed'),
+      $this->container->get('module_handler'),
+      $this->container->get('module_installer'),
+      $this->container->get('theme_handler'),
+      $this->container->get('string_translation')
+    );
+  }
+
+  /**
+   * Perform a config import from sync. folder.
+   */
+  public function doImport() {
+    $this->configImporter->reset()->import();
+  }
+
+  /**
+   * Perform a config export to sync. folder.
+   */
+  public function doExport() {
+    // Setup a config sync. dir with a, more or less,  know set of config
+    // entities. This is a full blown export of yaml files, written to the disk.
+    $destination = CONFIG_SYNC_DIRECTORY;
+    $destination_dir = config_get_config_directory($destination);
+    /** @var \Drupal\Core\Config\CachedStorage $source_storage */
+    $source_storage = \Drupal::service('config.storage');
+    $destination_storage = new FileStorage($destination_dir);
+    foreach ($source_storage->listAll() as $name) {
+      $destination_storage->write($name, $source_storage->read($name));
+    }
+  }
+}

tests/src/Functional/ConfigIgnoreHookTest.php

+<?php
+
+namespace Drupal\Tests\config_ignore\Functional;
+
+/**
+ * Test hook implementation of another module.
+ *
+ * @package Drupal\Tests\config_ignore\Functional
+ *
+ * @group config_ignore
+ * @runTestsInSeparateProcesses
+ * @preserveGlobalState disabled
+ */
+class ConfigIgnoreHookTest extends ConfigIgnoreBrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['config_ignore', 'config', 'config_filter', 'config_ignore_hook_test'];
+
+  /**
+   * Test hook implementation of another module.
+   */
+  public function testSettingsAlterHook() {
+
+    $this->config('system.site')->set('name', 'Test import')->save();
+
+    $this->doExport();
+
+    $this->config('system.site')->set('name', 'Changed title')->save();
+
+    $this->doImport();
+
+    $this->assertEquals('Changed title', $this->config('system.site')->get('name'));
+
+  }
+
+}

tests/src/Functional/ConfigIgnoreTest.php

@@ -2,12 +2,8 @@
 
 namespace Drupal\Tests\config_ignore\Functional;
 
-use Drupal\Core\Config\CachedStorage;
-use Drupal\Core\Config\FileStorage;
-use Drupal\Tests\BrowserTestBase;
-
 /**
- * Class ConfigIgnoreTest.
+ * Test functionality of config_ignore module.
  *
  * @package Drupal\Tests\config_ignore\Functional
  *
@@ -15,34 +11,18 @@ use Drupal\Tests\BrowserTestBase;
  * @runTestsInSeparateProcesses
  * @preserveGlobalState disabled
  */
-class ConfigIgnoreTest extends BrowserTestBase {
-
-  /**
-   * Modules to enable.
-   *
-   * @var array
-   */
-  public static $modules = ['config_ignore', 'config', 'config_filter'];
+class ConfigIgnoreTest extends ConfigIgnoreBrowserTestBase {
 
   /**
    * Verify that the Sync. table gets update with appropriate ignore actions.
    */
   public function testSyncTableUpdate() {
 
-    // Setup a config sync. dir with a, more or less,  know set of config
-    // entities. This is a full blown export of yaml files, written to the disk.
     $this->config('system.site')->set('name', 'Test import')->save();
     $this->config('system.date')->set('first_day', '0')->save();
     $this->config('config_ignore.settings')->set('ignored_config_entities', ['system.site'])->save();
 
-    $destination = CONFIG_SYNC_DIRECTORY;
-    $destination_dir = config_get_config_directory($destination);
-    /** @var CachedStorage $source_storage */
-    $source_storage = \Drupal::service('config.storage');
-    $destination_storage = new FileStorage($destination_dir);
-    foreach ($source_storage->listAll() as $name) {
-      $destination_storage->write($name, $source_storage->read($name));
-    }
+    $this->doExport();
 
     // Login with a user that has permission to sync. config.
     $this->drupalLogin($this->drupalCreateUser(['synchronize configuration']));