ErrorHandlerTest.php

<?php

namespace Drupal\Tests\system\Functional\System;

use Drupal\Component\Render\FormattableMarkup;
use Drupal\Tests\BrowserTestBase;

/**
 * Performs tests on the Drupal error and exception handler.
 *
 * @group system
 */
class ErrorHandlerTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'error_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Test the error handler.
     */
    public function testErrorHandler() {
        $config = $this->config('system.logging');
        $error_notice = [
            '%type' => 'Notice',
            '@message' => 'Undefined variable: bananas',
            '%function' => 'Drupal\\error_test\\Controller\\ErrorTestController->generateWarnings()',
            '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
        ];
        $error_warning = [
            '%type' => 'Warning',
            '@message' => 'Division by zero',
            '%function' => 'Drupal\\error_test\\Controller\\ErrorTestController->generateWarnings()',
            '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
        ];
        $error_user_notice = [
            '%type' => 'User warning',
            '@message' => 'Drupal & awesome',
            '%function' => 'Drupal\\error_test\\Controller\\ErrorTestController->generateWarnings()',
            '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
        ];
        // Set error reporting to display verbose notices.
        $this->config('system.logging')
            ->set('error_level', ERROR_REPORTING_DISPLAY_VERBOSE)
            ->save();
        $this->drupalGet('error-test/generate-warnings');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertErrorMessage($error_notice);
        $this->assertErrorMessage($error_warning);
        $this->assertErrorMessage($error_user_notice);
        $this->assertRaw('<pre class="backtrace">', 'Found pre element with backtrace class.');
        // Ensure we are escaping but not double escaping.
        $this->assertRaw('&amp;');
        $this->assertNoRaw('&amp;amp;');
        // Set error reporting to display verbose notices.
        $this->config('system.logging')
            ->set('error_level', ERROR_REPORTING_DISPLAY_VERBOSE)
            ->save();
        // Set error reporting to collect notices.
        $config->set('error_level', ERROR_REPORTING_DISPLAY_ALL)
            ->save();
        $this->drupalGet('error-test/generate-warnings');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertErrorMessage($error_notice);
        $this->assertErrorMessage($error_warning);
        $this->assertErrorMessage($error_user_notice);
        $this->assertNoRaw('<pre class="backtrace">', 'Did not find pre element with backtrace class.');
        // Set error reporting to not collect notices.
        $config->set('error_level', ERROR_REPORTING_DISPLAY_SOME)
            ->save();
        $this->drupalGet('error-test/generate-warnings');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertNoErrorMessage($error_notice);
        $this->assertErrorMessage($error_warning);
        $this->assertErrorMessage($error_user_notice);
        $this->assertNoRaw('<pre class="backtrace">', 'Did not find pre element with backtrace class.');
        // Set error reporting to not show any errors.
        $config->set('error_level', ERROR_REPORTING_HIDE)
            ->save();
        $this->drupalGet('error-test/generate-warnings');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertNoErrorMessage($error_notice);
        $this->assertNoErrorMessage($error_warning);
        $this->assertNoErrorMessage($error_user_notice);
        $this->assertNoMessages();
        $this->assertNoRaw('<pre class="backtrace">', 'Did not find pre element with backtrace class.');
    }
    
    /**
     * Test the exception handler.
     */
    public function testExceptionHandler() {
        $error_exception = [
            '%type' => 'Exception',
            '@message' => 'Drupal & awesome',
            '%function' => 'Drupal\\error_test\\Controller\\ErrorTestController->triggerException()',
            '%line' => 56,
            '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
        ];
        $error_pdo_exception = [
            '%type' => 'DatabaseExceptionWrapper',
            '@message' => 'SELECT b.* FROM {bananas_are_awesome} b',
            '%function' => 'Drupal\\error_test\\Controller\\ErrorTestController->triggerPDOException()',
            '%line' => 64,
            '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
        ];
        $error_renderer_exception = [
            '%type' => 'Exception',
            '@message' => 'This is an exception that occurs during rendering',
            '%function' => 'Drupal\\error_test\\Controller\\ErrorTestController->Drupal\\error_test\\Controller\\{closure}()',
            '%line' => 82,
            '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
        ];
        $this->drupalGet('error-test/trigger-exception');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertErrorMessage($error_exception);
        $this->drupalGet('error-test/trigger-pdo-exception');
        $this->assertSession()
            ->statusCodeEquals(500);
        // We cannot use assertErrorMessage() since the exact error reported
        // varies from database to database. Check that the SQL string is displayed.
        $this->assertText($error_pdo_exception['%type'], new FormattableMarkup('Found %type in error page.', $error_pdo_exception));
        // Assert statement improved since static queries adds table alias in the
        // error message.
        $this->assertSession()
            ->pageTextContains($error_pdo_exception['@message']);
        $error_details = new FormattableMarkup('in %function (line ', $error_pdo_exception);
        $this->assertRaw($error_details, new FormattableMarkup("Found '@message' in error page.", [
            '@message' => $error_details,
        ]));
        $this->drupalGet('error-test/trigger-renderer-exception');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertErrorMessage($error_renderer_exception);
        // Disable error reporting, ensure that 5xx responses are not cached.
        $this->config('system.logging')
            ->set('error_level', ERROR_REPORTING_HIDE)
            ->save();
        $this->drupalGet('error-test/trigger-exception');
        $this->assertNull($this->drupalGetHeader('X-Drupal-Cache'));
        $this->assertSession()
            ->responseHeaderNotContains('Cache-Control', 'public');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertNoErrorMessage($error_exception);
    }
    
    /**
     * Helper function: assert that the error message is found.
     */
    public function assertErrorMessage(array $error) {
        $message = new FormattableMarkup('%type: @message in %function (line ', $error);
        $this->assertRaw($message, new FormattableMarkup('Found error message: @message.', [
            '@message' => $message,
        ]));
    }
    
    /**
     * Helper function: assert that the error message is not found.
     */
    public function assertNoErrorMessage(array $error) {
        $message = new FormattableMarkup('%type: @message in %function (line ', $error);
        $this->assertNoRaw($message, new FormattableMarkup('Did not find error message: @message.', [
            '@message' => $message,
        ]));
    }
    
    /**
     * Asserts that no messages are printed onto the page.
     *
     * @return bool
     *   TRUE, if there are no messages.
     */
    protected function assertNoMessages() {
        return $this->assertEmpty($this->xpath('//div[contains(@class, "messages")]'), 'Ensures that also no messages div exists, which proves that no messages were generated by the error handler, not even an empty one.');
    }

}