WebDriverTestBase.php

<?php

declare (strict_types=1);
namespace Drupal\FunctionalJavascriptTests;

use Behat\Mink\Exception\DriverException;
use Drupal\Component\Utility\UrlHelper;
use Drupal\Tests\BrowserTestBase;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Runs a browser test using a driver that supports JavaScript.
 *
 * Module tests extending WebDriverTestBase must exist in the
 * Drupal\Tests\your_module\FunctionalJavascript namespace and live in the
 * modules/your_module/tests/src/FunctionalJavascript directory.
 *
 * Base class for testing browser interaction implemented in JavaScript.
 *
 * @ingroup testing
 */
abstract class WebDriverTestBase extends BrowserTestBase {
    
    /**
     * Determines if a test should fail on JavaScript console errors.
     *
     * @var bool
     */
    protected $failOnJavascriptConsoleErrors = TRUE;
    
    /**
     * Disables CSS animations in tests for more reliable testing.
     *
     * CSS animations are disabled by installing the css_disable_transitions_test
     * module. Set to FALSE to test CSS animations.
     *
     * @var bool
     */
    protected $disableCssAnimations = TRUE;
    
    /**
     * {@inheritdoc}
     */
    protected $minkDefaultDriverClass = DrupalSelenium2Driver::class;
    
    /**
     * {@inheritdoc}
     */
    protected function initMink() {
        if (!is_a($this->minkDefaultDriverClass, DrupalSelenium2Driver::class, TRUE)) {
            throw new \UnexpectedValueException(sprintf("%s has to be an instance of %s", $this->minkDefaultDriverClass, DrupalSelenium2Driver::class));
        }
        $this->minkDefaultDriverArgs = [
            'chrome',
            [
                'goog:chromeOptions' => [
                    'w3c' => FALSE,
                ],
            ],
            'http://localhost:4444',
        ];
        try {
            return parent::initMink();
        } catch (DriverException $e) {
            if ($this->minkDefaultDriverClass === DrupalSelenium2Driver::class) {
                $this->markTestSkipped("The test wasn't able to connect to your webdriver instance. For more information read core/tests/README.md.\n\nThe original message while starting Mink: {$e->getMessage()}");
            }
            else {
                throw $e;
            }
        } catch (\Exception $e) {
            $this->markTestSkipped('An unexpected error occurred while starting Mink: ' . $e->getMessage());
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function installModulesFromClassProperty(ContainerInterface $container) {
        self::$modules = [
            'js_testing_ajax_request_test',
            'js_testing_log_test',
            'jquery_keyevent_polyfill_test',
        ];
        if ($this->disableCssAnimations) {
            self::$modules[] = 'css_disable_transitions_test';
        }
        parent::installModulesFromClassProperty($container);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function initFrontPage() {
        parent::initFrontPage();
        // Set a standard window size so that all javascript tests start with the
        // same viewport.
        $this->getSession()
            ->resizeWindow(1024, 768);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function tearDown() : void {
        if ($this->mink) {
            // Wait for all requests to finish. It is possible that an AJAX request is
            // still on-going.
            $result = $this->getSession()
                ->wait(5000, 'window.drupalActiveXhrCount === 0 || typeof window.drupalActiveXhrCount === "undefined"');
            if (!$result) {
                // If the wait is unsuccessful, there may still be an AJAX request in
                // progress. If we tear down now, then this AJAX request may fail with
                // missing database tables, because tear down will have removed them.
                // Rather than allow it to fail, throw an explicit exception now
                // explaining what the problem is.
                throw new \RuntimeException('Unfinished AJAX requests while tearing down a test');
            }
            $warnings = $this->getSession()
                ->evaluateScript("JSON.parse(sessionStorage.getItem('js_testing_log_test.warnings') || JSON.stringify([]))");
            foreach ($warnings as $warning) {
                if (str_starts_with($warning, '[Deprecation]')) {
                    // phpcs:ignore Drupal.Semantics.FunctionTriggerError
                    @trigger_error('Javascript Deprecation:' . substr($warning, 13), E_USER_DEPRECATED);
                }
            }
        }
        parent::tearDown();
    }
    
    /**
     * Triggers a test failure if a JavaScript error was encountered.
     *
     * @throws \PHPUnit\Framework\AssertionFailedError
     *
     * @postCondition
     */
    protected function failOnJavaScriptErrors() : void {
        if ($this->failOnJavascriptConsoleErrors) {
            $errors = $this->getSession()
                ->evaluateScript("JSON.parse(sessionStorage.getItem('js_testing_log_test.errors') || JSON.stringify([]))");
            if (!empty($errors)) {
                $this->fail(implode("\n", $errors));
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getMinkDriverArgs() {
        if ($this->minkDefaultDriverClass === DrupalSelenium2Driver::class) {
            $json = getenv('MINK_DRIVER_ARGS_WEBDRIVER') ?: parent::getMinkDriverArgs();
            if (!($json === FALSE || $json === '')) {
                $args = json_decode($json, TRUE);
                if (isset($args[0]) && $args[0] === 'chrome' && !isset($args[1]['goog:chromeOptions']['w3c'])) {
                    // @todo https://www.drupal.org/project/drupal/issues/3421202
                    //   Deprecate defaulting behavior and require w3c to be set.
                    $args[1]['goog:chromeOptions']['w3c'] = FALSE;
                }
                $json = json_encode($args);
            }
            return $json;
        }
        return parent::getMinkDriverArgs();
    }
    
    /**
     * Waits for the given time or until the given JS condition becomes TRUE.
     *
     * @param string $condition
     *   JS condition to wait until it becomes TRUE.
     * @param int $timeout
     *   (Optional) Timeout in milliseconds, defaults to 10000.
     * @param string $message
     *   (optional) A message to display with the assertion. If left blank, a
     *   default message will be displayed.
     *
     * @throws \PHPUnit\Framework\AssertionFailedError
     *
     * @see \Behat\Mink\Driver\DriverInterface::evaluateScript()
     */
    protected function assertJsCondition($condition, $timeout = 10000, $message = '') {
        $message = $message ?: "JavaScript condition met:\n" . $condition;
        $result = $this->getSession()
            ->getDriver()
            ->wait($timeout, $condition);
        $this->assertTrue($result, $message);
    }
    
    /**
     * Creates a screenshot.
     *
     * @param string $filename
     *   The file name of the resulting screenshot including a writable path. For
     *   example, /tmp/test_screenshot.jpg.
     * @param bool $set_background_color
     *   (optional) By default this method will set the background color to white.
     *   Set to FALSE to override this behavior.
     *
     * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
     *   When operation not supported by the driver.
     * @throws \Behat\Mink\Exception\DriverException
     *   When the operation cannot be done.
     */
    protected function createScreenshot($filename, $set_background_color = TRUE) {
        $session = $this->getSession();
        if ($set_background_color) {
            $session->executeScript("document.body.style.backgroundColor = 'white';");
        }
        $image = $session->getScreenshot();
        file_put_contents($filename, $image);
    }
    
    /**
     * {@inheritdoc}
     */
    public function assertSession($name = NULL) {
        return new WebDriverWebAssert($this->getSession($name), $this->baseUrl);
    }
    
    /**
     * Gets the current Drupal javascript settings and parses into an array.
     *
     * Unlike BrowserTestBase::getDrupalSettings(), this implementation reads the
     * current values of drupalSettings, capturing all changes made via javascript
     * after the page was loaded.
     *
     * @return array
     *   The Drupal javascript settings array.
     *
     * @see \Drupal\Tests\BrowserTestBase::getDrupalSettings()
     */
    protected function getDrupalSettings() {
        $script = <<<EndOfScript
(function () {
  if (typeof drupalSettings !== 'undefined') {
    return drupalSettings;
  }
})();
EndOfScript;
        $settings = $this->getSession()
            ->evaluateScript($script) ?: [];
        if (isset($settings['ajaxPageState'])) {
            $settings['ajaxPageState']['libraries'] = UrlHelper::uncompressQueryParameter($settings['ajaxPageState']['libraries']);
        }
        return $settings;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getHtmlOutputHeaders() {
        // The webdriver API does not support fetching headers.
        return '';
    }

}