JavascriptErrorsTest.php

<?php

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

use PHPUnit\Framework\AssertionFailedError;

/**
 * Tests that Drupal.throwError will cause a test failure.
 *
 * @group javascript
 */
class JavascriptErrorsTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'js_errors_test',
    ];
    
    /**
     * Tests that JavaScript console errors will result in a test failure.
     */
    public function testJavascriptErrors() : void {
        // Visit page that will throw a JavaScript console error.
        $this->drupalGet('js_errors_test');
        // Ensure that errors from previous page loads will be
        // detected.
        $this->drupalGet('user');
        $this->expectException(AssertionFailedError::class);
        $this->expectExceptionMessageMatches('/^Error: A manually thrown error/');
        // Manually call the method under test, as it cannot be caught by PHPUnit
        // when triggered from assertPostConditions().
        $this->failOnJavaScriptErrors();
    }
    
    /**
     * Tests JavaScript console errors during asynchronous calls.
     */
    public function testJavascriptErrorsAsync() : void {
        // Visit page that will throw a JavaScript console error in async context.
        $this->drupalGet('js_errors_async_test');
        // Ensure that errors from previous page loads will be detected.
        $this->drupalGet('user');
        $this->expectException(AssertionFailedError::class);
        $this->expectExceptionMessageMatches('/^Error: An error thrown in async context./');
        // Manually call the method under test, as it cannot be caught by PHPUnit
        // when triggered from assertPostConditions().
        $this->failOnJavaScriptErrors();
    }
    
    /**
     * Clear the JavaScript error log to prevent this test failing for real.
     *
     * @postCondition
     */
    public function clearErrorLog() {
        $this->getSession()
            ->executeScript("sessionStorage.removeItem('js_testing_log_test.errors')");
    }

}