Issue #2969231 by quietone, NickDickinsonWilde, joachim, xjm: errors in...

Issue #2969231 by quietone, NickDickinsonWilde, joachim, xjm: errors in migration process configuration don't give a clear message

(cherry picked from commit 93545bd5)

core/modules/migrate/src/Plugin/Migration.php

@@ -386,6 +386,10 @@ protected function getProcessNormalized(array $process) {
       if (isset($configuration['plugin'])) {
         $configuration = [$configuration];
       }
+      if (!is_array($configuration)) {
+        $migration_id = $this->getPluginId();
+        throw new MigrateException("Invalid process for destination '$destination' in migration '$migration_id'");
+      }
       $normalized_configurations[$destination] = $configuration;
     }
     return $normalized_configurations;

core/modules/migrate/tests/src/Kernel/Plugin/MigrationTest.php

@@ -42,23 +42,64 @@ public function testGetProcessPluginsException() {
   }
 
   /**
-   * Tests Migration::getDestinationPlugin()
+   * Tests Migration::getProcessPlugins()
    *
-   * @covers ::getDestinationPlugin
+   * @param array $process
+   *   The migration process pipeline.
+   *
+   * @covers ::getProcessPlugins
+   *
+   * @dataProvider getProcessPluginsExceptionMessageProvider
    */
-  public function testGetProcessPluginsExceptionMessage() {
+  public function testGetProcessPluginsExceptionMessage(array $process) {
     // Test with an invalid process pipeline.
     $plugin_definition = [
-      'process' => [
-        'dest1' => 123,
-      ],
+      'id' => 'foo',
+      'process' => $process,
     ];
-    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($plugin_definition);
+
+    reset($process);
+    $destination = key(($process));
+
+    $migration = \Drupal::service('plugin.manager.migration')
+      ->createStubMigration($plugin_definition);
     $this->expectException(MigrateException::class);
-    $this->expectExceptionMessage("Process configuration for 'dest1' must be an array");
+    $this->expectExceptionMessage("Invalid process for destination '$destination' in migration 'foo'");
     $migration->getProcessPlugins();
   }
 
+  /**
+   * Provides data for testing invalid process pipeline.
+   */
+  public function getProcessPluginsExceptionMessageProvider() {
+    return [
+      [
+        'Null' =>
+          [
+            'dest' => NULL,
+          ],
+      ],
+      [
+        'boolean' =>
+          [
+            'dest' => TRUE,
+          ],
+      ],
+      [
+        'integer' =>
+          [
+            'dest' => 2370,
+          ],
+      ],
+      [
+        'float' =>
+          [
+            'dest' => 1.61,
+          ],
+      ],
+    ];
+  }
+
   /**
    * Tests Migration::getMigrationDependencies()
    *