class MigrationPluginManagerTest

class MigrationPluginManagerTest extends UnitTestCase {
  
  /**
   * A plugin manager.
   *
   * @var \Drupal\migrate\Plugin\MigrationPluginManager
   */
  protected $pluginManager;
  
  /**
   * {@inheritdoc}
   */
  public function setUp() : void {
    parent::setUp();
    // Get a plugin manager for testing.
    $module_handler = $this->createMock('Drupal\\Core\\Extension\\ModuleHandlerInterface');
    $cache_backend = $this->createMock('Drupal\\Core\\Cache\\CacheBackendInterface');
    $language_manager = $this->createMock('Drupal\\Core\\Language\\LanguageManagerInterface');
    $this->pluginManager = new MigrationPluginManager($module_handler, $cache_backend, $language_manager);
  }
  
  /**
   * Tests building dependencies for multiple migrations.
   *
   * @dataProvider dependencyProvider
   */
  public function testDependencyBuilding($migrations_data, $result_ids) {
    $migrations = [];
    foreach ($migrations_data as $migration_id => $migration_data) {
      $migrations[$migration_id] = new TestMigrationMock($migration_id, $migration_data['dependencies']);
    }
    $ordered_migrations = $this->pluginManager
      ->buildDependencyMigration($migrations, []);
    // Verify results.
    $this->assertEquals($result_ids, array_keys($ordered_migrations));
    foreach ($migrations_data as $migration_id => $migration_data) {
      $migration = $migrations[$migration_id];
      $requirements = $migration_data['result_requirements'];
      if (empty($requirements)) {
        $this->assertEquals([], $migration->set);
      }
      else {
        $requirements = array_combine($requirements, $requirements);
        $this->assertCount(1, $migration->set);
        [$set_prop, $set_requirements] = reset($migration->set);
        $this->assertEquals('requirements', $set_prop);
        $this->assertEquals($requirements, $set_requirements);
      }
    }
  }
  
  /**
   * Provide dependency data for testing.
   */
  public function dependencyProvider() {
    return [
      // Just one migration, with no dependencies.
[
        [
          'm1' => [
            'dependencies' => [],
            'result_requirements' => [],
          ],
        ],
        [
          'm1',
        ],
      ],
      // Just one migration, with required dependencies.
[
        [
          'm1' => [
            'dependencies' => [
              'required' => [
                'required1',
                'required2',
              ],
            ],
            'result_requirements' => [
              'required1',
              'required2',
            ],
          ],
        ],
        [
          'm1',
        ],
      ],
      // Just one migration, with optional dependencies.
[
        [
          'm1' => [
            'dependencies' => [
              'optional' => [
                'optional1',
              ],
            ],
            'result_requirements' => [],
          ],
        ],
        [
          'm1',
        ],
      ],
      // Multiple migrations.
[
        [
          'm1' => [
            'dependencies' => [
              'required' => [
                'required1',
                'required2',
              ],
            ],
            'result_requirements' => [
              'required1',
              'required2',
            ],
          ],
          'm2' => [
            'dependencies' => [
              'optional' => [
                'optional1',
              ],
            ],
            'result_requirements' => [],
          ],
        ],
        [
          'm1',
          'm2',
        ],
      ],
      // Multiple migrations, reordered due to optional requirement.
[
        [
          'm1' => [
            'dependencies' => [
              'optional' => [
                'm2',
              ],
            ],
            'result_requirements' => [],
          ],
          'm2' => [
            'dependencies' => [
              'optional' => [
                'optional1',
              ],
            ],
            'result_requirements' => [],
          ],
        ],
        [
          'm2',
          'm1',
        ],
      ],
      // Ensure that optional requirements aren't turned into required ones,
      // if the last migration has no optional deps.
[
        [
          'm1' => [
            'dependencies' => [
              'optional' => [
                'm2',
              ],
            ],
            'result_requirements' => [],
          ],
          'm2' => [
            'dependencies' => [],
            'result_requirements' => [],
          ],
        ],
        [
          'm2',
          'm1',
        ],
      ],
    ];
  }

}