class MigrateUpgradeFormStepsTest

class MigrateUpgradeFormStepsTest extends BrowserTestBase {
    use MigrationConfigurationTrait;
    use CreateTestContentEntitiesTrait;
    
    /**
     * {@inheritdoc}
     */
    public static $modules = [
        'migrate_drupal_ui',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        // Log in as user 1. Migrations in the UI can only be performed as user 1.
        $this->drupalLogin($this->rootUser);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getSourceBasePath() {
        return __DIR__ . '/files';
    }
    
    /**
     * Tests the flow of the Migrate Drupal UI form.
     *
     * The Migrate Drupal UI uses several forms to guide you through the upgrade
     * process. The forms displayed depend on if this is an incremental migration
     * or if there are potential ID conflicts. The forms are to be displayed in
     * this order; Overview or Incremental, if a migration has already been run
     * then Credential, Id conflict, if conflicts are detected, and lastly Review.
     */
    public function testMigrateUpgradeReviewPage() {
        
        /** @var \Drupal\Core\TempStore\PrivateTempStore  $store */
        $store = \Drupal::service('tempstore.private')->get('migrate_drupal_ui');
        $state = \Drupal::service('state');
        // Test that when data required by a form is missing that the correct first
        // form is displayed. The first form for an initial migration is the
        // Overview form and for an incremental migration it is the Incremental
        // form.
        $session = $this->assertSession();
        // Get the current major version.
        list($destination_site_version) = explode('.', \Drupal::VERSION, 2);
        $expected['initial'] = "Upgrade a site by importing its files and the data from its database into a clean and empty new install of Drupal {$destination_site_version}.";
        $expected['incremental'] = "An upgrade has already been performed on this site.";
        foreach ([
            '/upgrade',
            '/upgrade/incremental',
        ] as $expected) {
            if ($expected === '/upgrade/incremental') {
                // Set a performed time to signify an incremental migration. The time
                // value is a UNIX timestamp.
                $state->set('migrate_drupal_ui.performed', 1);
            }
            // Test that an invalid step to any form goes to the correct first form.
            $store->set('step', 'foo');
            $this->assertFirstForm($session, $expected);
            // Test that an undefined step to any form goes to the correct first form.
            $store->delete('step');
            $this->assertFirstForm($session, $expected);
            // For forms that require data from the private store, test that when that
            // data is missing the correct first page is displayed.
            // The Id conflict form requires the migrations array.
            $store->delete('migrations');
            $store->set('step', 'idconflict');
            $this->drupalGet('/upgrade/idconflict');
            $session->addressEquals($expected);
            // The Review form requires version, migrations and system_data. Test
            // three times with only one of the variables missing.
            $store->delete('version');
            $store->set('migrations', [
                'foo',
                'bar',
            ]);
            $store->set('system_data', [
                'bar',
                'foo',
            ]);
            $store->set('step', 'review');
            $this->drupalGet('/upgrade/review');
            $session->addressEquals($expected);
            $store->set('version', '6');
            $store->delete('migrations');
            $store->set('system_data', [
                'bar',
                'foo',
            ]);
            $store->set('step', 'review');
            $this->drupalGet('/upgrade/review');
            $session->addressEquals($expected);
            $store->set('version', '6');
            $store->set('migrations', [
                'foo',
                'bar',
            ]);
            $store->delete('system_data');
            $store->set('step', 'review');
            $this->drupalGet('/upgrade/review');
            $session->addressEquals($expected);
        }
        // Test that the credential form is displayed for incremental migrations.
        $store->set('step', 'overview');
        $this->drupalGet('/upgrade');
        $session->pageTextContains("An upgrade has already been performed on this site. To perform a new migration, create a clean and empty new install of Drupal {$destination_site_version}. Rollbacks are not yet supported through the user interface.");
        $this->drupalPostForm(NULL, [], t('Import new configuration and content from old site'));
        $session->pageTextContains('Provide credentials for the database of the Drupal site you want to upgrade.');
    }
    
    /**
     * Helper to test that a path goes to the Overview form.
     *
     * @param \Drupal\Tests\WebAssert $session
     *   The WebAssert object.
     * @param string $expected
     *   The expected response text.
     */
    protected function assertFirstForm(WebAssert $session, $expected) {
        $paths = [
            '',
            '/incremental',
            '/credentials',
            '/idconflict',
            '/review',
        ];
        foreach ($paths as $path) {
            $this->drupalGet('/upgrade' . $path);
            $session->addressEquals($expected);
        }
    }

}