Issue #2580389 by benjy, alexpott, jibran: Allow test classes to specify the config object exceptions

core/lib/Drupal/Core/Config/Testing/ConfigSchemaChecker.php

@@ -43,14 +43,24 @@ class ConfigSchemaChecker implements EventSubscriberInterface {
    */
   protected $checked = array();
 
+  /**
+   * An array of config object names that are excluded from schema checking.
+   *
+   * @var string[]
+   */
+  protected $exclude = array();
+
   /**
    * Constructs the ConfigSchemaChecker object.
    *
    * @param \Drupal\Core\Config\TypedConfigManagerInterface $typed_manager
    *   The typed config manager.
+   * @param string[] $exclude
+   *   An array of config object names that are excluded from schema checking.
    */
-  public function __construct(TypedConfigManagerInterface $typed_manager) {
+  public function __construct(TypedConfigManagerInterface $typed_manager, array $exclude = array()) {
     $this->typedManager = $typed_manager;
+    $this->exclude = $exclude;
   }
 
   /**
@@ -74,17 +84,7 @@ class ConfigSchemaChecker implements EventSubscriberInterface {
     $name = $saved_config->getName();
     $data = $saved_config->get();
     $checksum = hash('crc32b', serialize($data));
-    $exceptions = array(
-      // Following are used to test lack of or partial schema. Where partial
-      // schema is provided, that is explicitly tested in specific tests.
-      'config_schema_test.noschema',
-      'config_schema_test.someschema',
-      'config_schema_test.schema_data_types',
-      'config_schema_test.no_schema_data_types',
-      // Used to test application of schema to filtering of configuration.
-      'config_test.dynamic.system',
-    );
-    if (!in_array($name, $exceptions) && !isset($this->checked[$name . ':' . $checksum])) {
+    if (!in_array($name, $this->exclude) && !isset($this->checked[$name . ':' . $checksum])) {
       $this->checked[$name . ':' . $checksum] = TRUE;
       $errors = $this->checkConfigSchema($this->typedManager, $name, $data);
       if ($errors === FALSE) {

core/modules/simpletest/src/KernelTestBase.php

@@ -322,6 +322,7 @@ EOD;
       $container
         ->register('simpletest.config_schema_checker', 'Drupal\Core\Config\Testing\ConfigSchemaChecker')
         ->addArgument(new Reference('config.typed'))
+        ->addArgument($this->getConfigSchemaExclusions())
         ->addTag('event_subscriber');
     }
 

core/modules/simpletest/src/TestBase.php

@@ -294,6 +294,22 @@ abstract class TestBase {
    */
   protected $strictConfigSchema = TRUE;
 
+  /**
+   * An array of config object names that are excluded from schema checking.
+   *
+   * @var string[]
+   */
+  protected static $configSchemaCheckerExclusions = array(
+    // Following are used to test lack of or partial schema. Where partial
+    // schema is provided, that is explicitly tested in specific tests.
+    'config_schema_test.noschema',
+    'config_schema_test.someschema',
+    'config_schema_test.schema_data_types',
+    'config_schema_test.no_schema_data_types',
+    // Used to test application of schema to filtering of configuration.
+    'config_test.dynamic.system',
+  );
+
   /**
    * HTTP authentication method (specified as a CURLAUTH_* constant).
    *
@@ -1585,4 +1601,23 @@ abstract class TestBase {
     return $this->tempFilesDirectory;
   }
 
+  /**
+   * Gets the config schema exclusions for this test.
+   *
+   * @return string[]
+   *   An array of config object names that are excluded from schema checking.
+   */
+  protected function getConfigSchemaExclusions() {
+    $class = get_class($this);
+    $exceptions = [];
+    while ($class) {
+      if (property_exists($class, 'configSchemaCheckerExclusions')) {
+        $exceptions = array_merge($exceptions, $class::$configSchemaCheckerExclusions);
+      }
+      $class = get_parent_class($class);
+    }
+    // Filter out any duplicates.
+    return array_unique($exceptions);
+  }
+
 }

core/modules/simpletest/src/WebTestBase.php

@@ -785,7 +785,7 @@ abstract class WebTestBase extends TestBase {
       $services = $yaml->parse($content);
       $services['services']['simpletest.config_schema_checker'] = [
         'class' => 'Drupal\Core\Config\Testing\ConfigSchemaChecker',
-        'arguments' => ['@config.typed'],
+        'arguments' => ['@config.typed', $this->getConfigSchemaExclusions()],
         'tags' => [['name' => 'event_subscriber']]
       ];
       file_put_contents($directory . '/services.yml', $yaml->dump($services));