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',
                ],
            ],
        ];
    }

}