UpdateScriptTest.php

<?php

namespace Drupal\Tests\system\Functional\UpdateSystem;

use Drupal\Component\Serialization\Yaml;
use Drupal\Core\Url;
use Drupal\language\Entity\ConfigurableLanguage;
use Drupal\Tests\BrowserTestBase;
use Drupal\Tests\RequirementsPageTrait;

/**
 * Tests the update script access and functionality.
 *
 * @group Update
 */
class UpdateScriptTest extends BrowserTestBase {
    use RequirementsPageTrait;
    const HANDBOOK_MESSAGE = 'Review the suggestions for resolving this incompatibility to repair your installation, and then re-run update.php.';
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'update_script_test',
        'dblog',
        'language',
        'test_module_required_by_theme',
        'test_another_module_required_by_theme',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected $dumpHeaders = TRUE;
    
    /**
     * The URL to the status report page.
     *
     * @var \Drupal\Core\Url
     */
    protected $statusReportUrl;
    
    /**
     * URL to the update.php script.
     *
     * @var string
     */
    private $updateUrl;
    
    /**
     * A user with the necessary permissions to administer software updates.
     *
     * @var \Drupal\user\UserInterface
     */
    private $updateUser;
    protected function setUp() {
        parent::setUp();
        $this->updateUrl = Url::fromRoute('system.db_update');
        $this->statusReportUrl = Url::fromRoute('system.status');
        $this->updateUser = $this->drupalCreateUser([
            'administer software updates',
            'access site in maintenance mode',
            'administer themes',
        ]);
    }
    
    /**
     * Tests access to the update script.
     */
    public function testUpdateAccess() {
        // Try accessing update.php without the proper permission.
        $regular_user = $this->drupalCreateUser();
        $this->drupalLogin($regular_user);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->statusCodeEquals(403);
        // Check that a link to the update page is not accessible to regular users.
        $this->drupalGet('/update-script-test/database-updates-menu-item');
        $this->assertSession()
            ->linkNotExists('Run database updates');
        // Try accessing update.php as an anonymous user.
        $this->drupalLogout();
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->statusCodeEquals(403);
        // Check that a link to the update page is not accessible to anonymous
        // users.
        $this->drupalGet('/update-script-test/database-updates-menu-item');
        $this->assertSession()
            ->linkNotExists('Run database updates');
        // Access the update page with the proper permission.
        $this->drupalLogin($this->updateUser);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        // Check that a link to the update page is accessible to users with proper
        // permissions.
        $this->drupalGet('/update-script-test/database-updates-menu-item');
        $this->assertSession()
            ->linkExists('Run database updates');
        // Access the update page as user 1.
        $this->drupalLogin($this->rootUser);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        // Check that a link to the update page is accessible to user 1.
        $this->drupalGet('/update-script-test/database-updates-menu-item');
        $this->assertSession()
            ->linkExists('Run database updates');
    }
    
    /**
     * Tests that requirements warnings and errors are correctly displayed.
     */
    public function testRequirements() {
        $update_script_test_config = $this->config('update_script_test.settings');
        $this->drupalLogin($this->updateUser);
        // If there are no requirements warnings or errors, we expect to be able to
        // go through the update process uninterrupted.
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        $this->assertText(t('No pending updates.'), 'End of update process was reached.');
        // Confirm that all caches were cleared.
        $this->assertText(t('hook_cache_flush() invoked for update_script_test.module.'), 'Caches were cleared when there were no requirements warnings or errors.');
        // If there is a requirements warning, we expect it to be initially
        // displayed, but clicking the link to proceed should allow us to go
        // through the rest of the update process uninterrupted.
        // First, run this test with pending updates to make sure they can be run
        // successfully.
        $this->drupalLogin($this->updateUser);
        $update_script_test_config->set('requirement_type', REQUIREMENT_WARNING)
            ->save();
        drupal_set_installed_schema_version('update_script_test', drupal_get_installed_schema_version('update_script_test') - 1);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertText('This is a requirements warning provided by the update_script_test module.');
        $this->clickLink('try again');
        $this->assertNoText('This is a requirements warning provided by the update_script_test module.');
        $this->clickLink(t('Continue'));
        $this->clickLink(t('Apply pending updates'));
        $this->checkForMetaRefresh();
        $this->assertText(t('The update_script_test_update_8001() update was executed successfully.'), 'End of update process was reached.');
        // Confirm that all caches were cleared.
        $this->assertText(t('hook_cache_flush() invoked for update_script_test.module.'), 'Caches were cleared after resolving a requirements warning and applying updates.');
        // Now try again without pending updates to make sure that works too.
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertText('This is a requirements warning provided by the update_script_test module.');
        $this->clickLink('try again');
        $this->assertNoText('This is a requirements warning provided by the update_script_test module.');
        $this->clickLink(t('Continue'));
        $this->assertText(t('No pending updates.'), 'End of update process was reached.');
        // Confirm that all caches were cleared.
        $this->assertText(t('hook_cache_flush() invoked for update_script_test.module.'), 'Caches were cleared after applying updates and re-running the script.');
        // If there is a requirements error, it should be displayed even after
        // clicking the link to proceed (since the problem that triggered the error
        // has not been fixed).
        $update_script_test_config->set('requirement_type', REQUIREMENT_ERROR)
            ->save();
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertText('This is a requirements error provided by the update_script_test module.');
        $this->clickLink('try again');
        $this->assertText('This is a requirements error provided by the update_script_test module.');
        // Ensure that changes to a module's requirements that would cause errors
        // are displayed correctly.
        $update_script_test_config->set('requirement_type', REQUIREMENT_OK)
            ->save();
        \Drupal::state()->set('update_script_test.system_info_alter', [
            'dependencies' => [
                'a_module_that_does_not_exist',
            ],
        ]);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->responseContains('a_module_that_does_not_exist (Missing)');
        $this->assertSession()
            ->responseContains('Update script test requires this module.');
        \Drupal::state()->set('update_script_test.system_info_alter', [
            'dependencies' => [
                'node (<7.x-0.0-dev)',
            ],
        ]);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->assertEscaped('Node (Version <7.x-0.0-dev required)');
        $this->assertSession()
            ->responseContains('Update script test requires this module and version. Currently using Node version ' . \Drupal::VERSION);
        // Test that issues with modules that themes depend on are properly
        // displayed.
        $this->assertSession()
            ->responseNotContains('Test Module Required by Theme');
        $this->drupalGet('admin/appearance');
        $this->getSession()
            ->getPage()
            ->clickLink('Install Test Theme Depending on Modules theme');
        $this->assertSession()
            ->addressEquals('admin/appearance');
        $this->assertSession()
            ->pageTextContains('The Test Theme Depending on Modules theme has been installed');
        // Ensure that when a theme depends on a module and that module's
        // requirements change, errors are displayed in the same manner as modules
        // depending on other modules.
        \Drupal::state()->set('test_theme_depending_on_modules.system_info_alter', [
            'dependencies' => [
                'test_module_required_by_theme (<7.x-0.0-dev)',
            ],
        ]);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->assertEscaped('Test Module Required by Theme (Version <7.x-0.0-dev required)');
        $this->assertSession()
            ->responseContains('Test Theme Depending on Modules requires this module and version. Currently using Test Module Required by Theme version ' . \Drupal::VERSION);
        // Ensure that when a theme is updated to depend on an unavailable module,
        // errors are displayed in the same manner as modules depending on other
        // modules.
        \Drupal::state()->set('test_theme_depending_on_modules.system_info_alter', [
            'dependencies' => [
                'a_module_theme_needs_that_does_not_exist',
            ],
        ]);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->responseContains('a_module_theme_needs_that_does_not_exist (Missing)');
        $this->assertSession()
            ->responseContains('Test Theme Depending on Modules requires this module.');
    }
    
    /**
     * Tests that extension compatibility changes are handled correctly.
     *
     * @param array $correct_info
     *   The initial values for info.yml fail. These should compatible with core.
     * @param array $breaking_info
     *   The values to the info.yml that are not compatible with core.
     * @param string $expected_error
     *   The expected error.
     *
     * @dataProvider providerExtensionCompatibilityChange
     */
    public function testExtensionCompatibilityChange(array $correct_info, array $breaking_info, $expected_error) {
        $extension_type = $correct_info['type'];
        $this->drupalLogin($this->drupalCreateUser([
            'administer software updates',
            'administer site configuration',
            $extension_type === 'module' ? 'administer modules' : 'administer themes',
        ]));
        $extension_machine_name = "changing_extension";
        $extension_name = "{$extension_machine_name} name";
        $test_error_text = "Incompatible {$extension_type} " . $expected_error . $extension_name . static::HANDBOOK_MESSAGE;
        $base_info = [
            'name' => $extension_name,
        ];
        if ($extension_type === 'theme') {
            $base_info['base theme'] = FALSE;
        }
        $folder_path = \Drupal::service('site.path') . "/{$extension_type}s/{$extension_machine_name}";
        $file_path = "{$folder_path}/{$extension_machine_name}.info.yml";
        mkdir($folder_path, 0777, TRUE);
        file_put_contents($file_path, Yaml::encode($base_info + $correct_info));
        $this->enableExtension($extension_type, $extension_machine_name, $extension_name);
        $this->assertInstalledExtensionConfig($extension_type, $extension_machine_name);
        // If there are no requirements warnings or errors, we expect to be able to
        // go through the update process uninterrupted.
        $this->assertUpdateWithNoError($test_error_text, $extension_type, $extension_machine_name);
        // Change the values in the info.yml and confirm updating is not possible.
        file_put_contents($file_path, Yaml::encode($base_info + $breaking_info));
        $this->assertErrorOnUpdate($test_error_text, $extension_type, $extension_machine_name);
        // Fix the values in the info.yml file and confirm updating is possible
        // again.
        file_put_contents($file_path, Yaml::encode($base_info + $correct_info));
        $this->assertUpdateWithNoError($test_error_text, $extension_type, $extension_machine_name);
    }
    
    /**
     * Date provider for testExtensionCompatibilityChange().
     */
    public function providerExtensionCompatibilityChange() {
        $incompatible_module_message = "The following module is installed, but it is incompatible with Drupal " . \Drupal::VERSION . ":";
        $incompatible_theme_message = "The following theme is installed, but it is incompatible with Drupal " . \Drupal::VERSION . ":";
        return [
            'module: core key incompatible' => [
                [
                    'core_version_requirement' => '^8 || ^9',
                    'type' => 'module',
                ],
                [
                    'core' => '7.x',
                    'type' => 'module',
                ],
                $incompatible_module_message,
            ],
            'module: core_version_requirement key incompatible' => [
                [
                    'core_version_requirement' => '^8 || ^9',
                    'type' => 'module',
                ],
                [
                    'core_version_requirement' => '8.7.7',
                    'type' => 'module',
                ],
                $incompatible_module_message,
            ],
            'theme: core key incompatible' => [
                [
                    'core_version_requirement' => '^8 || ^9',
                    'type' => 'theme',
                ],
                [
                    'core' => '7.x',
                    'type' => 'theme',
                ],
                $incompatible_theme_message,
            ],
            'theme: core_version_requirement key incompatible' => [
                [
                    'core_version_requirement' => '^8 || ^9',
                    'type' => 'theme',
                ],
                [
                    'core_version_requirement' => '8.7.7',
                    'type' => 'theme',
                ],
                $incompatible_theme_message,
            ],
            'module: php requirement' => [
                [
                    'core_version_requirement' => '^8 || ^9',
                    'type' => 'module',
                    'php' => 1,
                ],
                [
                    'core_version_requirement' => '^8 || ^9',
                    'type' => 'module',
                    'php' => 1000000000,
                ],
                'The following module is installed, but it is incompatible with PHP ' . phpversion() . ":",
            ],
            'theme: php requirement' => [
                [
                    'core_version_requirement' => '^8 || ^9',
                    'type' => 'theme',
                    'php' => 1,
                ],
                [
                    'core_version_requirement' => '^8 || ^9',
                    'type' => 'theme',
                    'php' => 1000000000,
                ],
                'The following theme is installed, but it is incompatible with PHP ' . phpversion() . ":",
            ],
        ];
    }
    
    /**
     * Tests that a missing extension prevents updates.
     *
     * @param string $extension_type
     *   The extension type, either 'module' or 'theme'.
     *
     * @dataProvider providerMissingExtension
     */
    public function testMissingExtension($extension_type) {
        $this->drupalLogin($this->drupalCreateUser([
            'administer software updates',
            'administer site configuration',
            $extension_type === 'module' ? 'administer modules' : 'administer themes',
        ]));
        $extension_machine_name = "disappearing_{$extension_type}";
        $extension_name = 'The magically disappearing extension';
        $test_error_text = "Missing or invalid {$extension_type} " . "The following {$extension_type} is marked as installed in the core.extension configuration, but it is missing:" . $extension_machine_name . static::HANDBOOK_MESSAGE;
        $extension_info = [
            'name' => $extension_name,
            'type' => $extension_type,
            'core_version_requirement' => '^8 || ^9',
        ];
        if ($extension_type === 'theme') {
            $extension_info['base theme'] = FALSE;
        }
        $folder_path = \Drupal::service('site.path') . "/{$extension_type}s/{$extension_machine_name}";
        $file_path = "{$folder_path}/{$extension_machine_name}.info.yml";
        mkdir($folder_path, 0777, TRUE);
        file_put_contents($file_path, Yaml::encode($extension_info));
        $this->enableExtension($extension_type, $extension_machine_name, $extension_name);
        // If there are no requirements warnings or errors, we expect to be able to
        // go through the update process uninterrupted.
        $this->assertUpdateWithNoError($test_error_text, $extension_type, $extension_machine_name);
        // Delete the info.yml and confirm updates are prevented.
        unlink($file_path);
        $this->assertErrorOnUpdate($test_error_text, $extension_type, $extension_machine_name);
        // Add the info.yml file back and confirm we are able to go through the
        // update process uninterrupted.
        file_put_contents($file_path, Yaml::encode($extension_info));
        $this->assertUpdateWithNoError($test_error_text, $extension_type, $extension_machine_name);
    }
    
    /**
     * Tests that orphan schemas are handled properly.
     */
    public function testOrphanedSchemaEntries() {
        $this->drupalLogin($this->updateUser);
        // Insert a bogus value into the system.schema key/value storage for a
        // nonexistent module. This replicates what would happen if you had a module
        // installed and then completely remove it from the filesystem and clear it
        // out of the core.extension config list without uninstalling it cleanly.
        \Drupal::keyValue('system.schema')->set('my_already_removed_module', 8000);
        // Visit update.php and make sure we can click through to the 'No pending
        // updates' page without errors.
        $assert_session = $this->assertSession();
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        // Make sure there are no pending updates (or uncaught exceptions).
        $status_messages = $this->xpath('//div[@aria-label="Status message"]');
        $this->assertCount(1, $status_messages);
        $this->assertStringContainsString('No pending updates.', $status_messages[0]->getText());
        // Verify that we warn the admin about this situation.
        $warning_messages = $this->xpath('//div[@aria-label="Warning message"]');
        $this->assertCount(1, $warning_messages);
        $this->assertEquals('Warning message Module my_already_removed_module has an entry in the system.schema key/value storage, but is missing from your site. More information about this error.', $warning_messages[0]->getText());
        // Try again with another orphaned entry, this time for a test module that
        // does exist in the filesystem.
        \Drupal::keyValue('system.schema')->delete('my_already_removed_module');
        \Drupal::keyValue('system.schema')->set('update_test_0', 8000);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        // There should not be any pending updates.
        $status_messages = $this->xpath('//div[@aria-label="Status message"]');
        $this->assertCount(1, $status_messages);
        $this->assertStringContainsString('No pending updates.', $status_messages[0]->getText());
        // But verify that we warn the admin about this situation.
        $warning_messages = $this->xpath('//div[@aria-label="Warning message"]');
        $this->assertCount(1, $warning_messages);
        $this->assertEquals('Warning message Module update_test_0 has an entry in the system.schema key/value storage, but is not installed. More information about this error.', $warning_messages[0]->getText());
        // Finally, try with both kinds of orphans and make sure we get both warnings.
        \Drupal::keyValue('system.schema')->set('my_already_removed_module', 8000);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        // There still should not be any pending updates.
        $status_messages = $this->xpath('//div[@aria-label="Status message"]');
        $this->assertCount(1, $status_messages);
        $this->assertStringContainsString('No pending updates.', $status_messages[0]->getText());
        // Verify that we warn the admin about both orphaned entries.
        $warning_messages = $this->xpath('//div[@aria-label="Warning message"]');
        $this->assertCount(1, $warning_messages);
        $warning_message_text = $warning_messages[0]->getText();
        $this->assertStringContainsString('Module update_test_0 has an entry in the system.schema key/value storage, but is not installed. More information about this error.', $warning_message_text);
        $this->assertStringNotContainsString('Module update_test_0 has an entry in the system.schema key/value storage, but is missing from your site.', $warning_message_text);
        $this->assertStringContainsString('Module my_already_removed_module has an entry in the system.schema key/value storage, but is missing from your site. More information about this error.', $warning_message_text);
        $this->assertStringNotContainsString('Module my_already_removed_module has an entry in the system.schema key/value storage, but is not installed.', $warning_message_text);
    }
    
    /**
     * Data provider for testMissingExtension().
     */
    public function providerMissingExtension() {
        return [
            'module' => [
                'module',
            ],
            'theme' => [
                'theme',
            ],
        ];
    }
    
    /**
     * Enables an extension using the UI.
     *
     * @param string $extension_type
     *   The extension type.
     * @param string $extension_machine_name
     *   The extension machine name.
     * @param string $extension_name
     *   The extension name.
     */
    protected function enableExtension($extension_type, $extension_machine_name, $extension_name) {
        if ($extension_type === 'module') {
            $edit = [
                "modules[{$extension_machine_name}][enable]" => $extension_machine_name,
            ];
            $this->drupalPostForm('admin/modules', $edit, t('Install'));
        }
        elseif ($extension_type === 'theme') {
            $this->drupalGet('admin/appearance');
            $this->click("a[title~=\"{$extension_name}\"]");
        }
    }
    
    /**
     * Tests the effect of using the update script on the theme system.
     */
    public function testThemeSystem() {
        // Since visiting update.php triggers a rebuild of the theme system from an
        // unusual maintenance mode environment, we check that this rebuild did not
        // put any incorrect information about the themes into the database.
        $original_theme_data = $this->config('core.extension')
            ->get('theme');
        $this->drupalLogin($this->updateUser);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $final_theme_data = $this->config('core.extension')
            ->get('theme');
        $this->assertEqual($original_theme_data, $final_theme_data, 'Visiting update.php does not alter the information about themes stored in the database.');
    }
    
    /**
     * Tests update.php when there are no updates to apply.
     */
    public function testNoUpdateFunctionality() {
        // Click through update.php with 'administer software updates' permission.
        $this->drupalLogin($this->updateUser);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        $this->assertText(t('No pending updates.'));
        $this->assertSession()
            ->linkNotExists('Administration pages');
        $this->assertEmpty($this->xpath('//main//a[contains(@href, :href)]', [
            ':href' => 'update.php',
        ]));
        $this->clickLink('Front page');
        $this->assertSession()
            ->statusCodeEquals(200);
        // Click through update.php with 'access administration pages' permission.
        $admin_user = $this->drupalCreateUser([
            'administer software updates',
            'access administration pages',
        ]);
        $this->drupalLogin($admin_user);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        $this->assertText(t('No pending updates.'));
        $this->assertSession()
            ->linkExists('Administration pages');
        $this->assertEmpty($this->xpath('//main//a[contains(@href, :href)]', [
            ':href' => 'update.php',
        ]));
        $this->clickLink('Administration pages');
        $this->assertSession()
            ->statusCodeEquals(200);
    }
    
    /**
     * Tests update.php after performing a successful update.
     */
    public function testSuccessfulUpdateFunctionality() {
        $initial_maintenance_mode = $this->container
            ->get('state')
            ->get('system.maintenance_mode');
        $this->assertNull($initial_maintenance_mode, 'Site is not in maintenance mode.');
        $this->runUpdates($initial_maintenance_mode);
        $final_maintenance_mode = $this->container
            ->get('state')
            ->get('system.maintenance_mode');
        $this->assertEqual($final_maintenance_mode, $initial_maintenance_mode, 'Maintenance mode should not have changed after database updates.');
        // Reset the static cache to ensure we have the most current setting.
        $schema_version = drupal_get_installed_schema_version('update_script_test', TRUE);
        $this->assertEqual($schema_version, 8001, 'update_script_test schema version is 8001 after updating.');
        // Set the installed schema version to one less than the current update.
        drupal_set_installed_schema_version('update_script_test', $schema_version - 1);
        $schema_version = drupal_get_installed_schema_version('update_script_test', TRUE);
        $this->assertEqual($schema_version, 8000, 'update_script_test schema version overridden to 8000.');
        // Click through update.php with 'access administration pages' and
        // 'access site reports' permissions.
        $admin_user = $this->drupalCreateUser([
            'administer software updates',
            'access administration pages',
            'access site reports',
            'access site in maintenance mode',
        ]);
        $this->drupalLogin($admin_user);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        $this->clickLink(t('Apply pending updates'));
        $this->checkForMetaRefresh();
        $this->assertText('Updates were attempted.');
        $this->assertSession()
            ->linkExists('logged');
        $this->assertSession()
            ->linkExists('Administration pages');
        $this->assertEmpty($this->xpath('//main//a[contains(@href, :href)]', [
            ':href' => 'update.php',
        ]));
        $this->clickLink('Administration pages');
        $this->assertSession()
            ->statusCodeEquals(200);
    }
    
    /**
     * Tests update.php while in maintenance mode.
     */
    public function testMaintenanceModeUpdateFunctionality() {
        $this->container
            ->get('state')
            ->set('system.maintenance_mode', TRUE);
        $initial_maintenance_mode = $this->container
            ->get('state')
            ->get('system.maintenance_mode');
        $this->assertTrue($initial_maintenance_mode, 'Site is in maintenance mode.');
        $this->runUpdates($initial_maintenance_mode);
        $final_maintenance_mode = $this->container
            ->get('state')
            ->get('system.maintenance_mode');
        $this->assertEqual($final_maintenance_mode, $initial_maintenance_mode, 'Maintenance mode should not have changed after database updates.');
    }
    
    /**
     * Tests perfoming updates with update.php in a multilingual environment.
     */
    public function testSuccessfulMultilingualUpdateFunctionality() {
        // Add some custom languages.
        foreach ([
            'aa',
            'bb',
        ] as $language_code) {
            ConfigurableLanguage::create([
                'id' => $language_code,
                'label' => $this->randomMachineName(),
            ])
                ->save();
        }
        $config = \Drupal::service('config.factory')->getEditable('language.negotiation');
        // Ensure path prefix is used to determine the language.
        $config->set('url.source', 'path_prefix');
        // Ensure that there's a path prefix set for english as well.
        $config->set('url.prefixes.en', 'en');
        $config->save();
        // Reset the static cache to ensure we have the most current setting.
        $schema_version = drupal_get_installed_schema_version('update_script_test', TRUE);
        $this->assertEqual($schema_version, 8001, 'update_script_test schema version is 8001 after updating.');
        // Set the installed schema version to one less than the current update.
        drupal_set_installed_schema_version('update_script_test', $schema_version - 1);
        $schema_version = drupal_get_installed_schema_version('update_script_test', TRUE);
        $this->assertEqual($schema_version, 8000, 'update_script_test schema version overridden to 8000.');
        // Create admin user.
        $admin_user = $this->drupalCreateUser([
            'administer software updates',
            'access administration pages',
            'access site reports',
            'access site in maintenance mode',
            'administer site configuration',
        ]);
        $this->drupalLogin($admin_user);
        // Visit status report page and ensure, that link to update.php has no path prefix set.
        $this->drupalGet('en/admin/reports/status', [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertLinkByHref('/update.php');
        $this->assertNoLinkByHref('en/update.php');
        // Click through update.php with 'access administration pages' and
        // 'access site reports' permissions.
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        $this->clickLink(t('Apply pending updates'));
        $this->checkForMetaRefresh();
        $this->assertText('Updates were attempted.');
        $this->assertSession()
            ->linkExists('logged');
        $this->assertSession()
            ->linkExists('Administration pages');
        $this->assertEmpty($this->xpath('//main//a[contains(@href, :href)]', [
            ':href' => 'update.php',
        ]));
        $this->clickLink('Administration pages');
        $this->assertSession()
            ->statusCodeEquals(200);
    }
    
    /**
     * Tests maintenance mode link on update.php.
     */
    public function testMaintenanceModeLink() {
        $full_admin_user = $this->drupalCreateUser([
            'administer software updates',
            'access administration pages',
            'administer site configuration',
        ]);
        $this->drupalLogin($full_admin_user);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->clickLink('maintenance mode');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->elementContains('css', 'main h1', 'Maintenance mode');
        // Now login as a user with only 'administer software updates' (but not
        // 'administer site configuration') permission and try again.
        $this->drupalLogin($this->updateUser);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->clickLink('maintenance mode');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->elementContains('css', 'main h1', 'Maintenance mode');
    }
    
    /**
     * Helper function to run updates via the browser.
     */
    protected function runUpdates($maintenance_mode) {
        $schema_version = drupal_get_installed_schema_version('update_script_test');
        $this->assertEqual($schema_version, 8001, 'update_script_test is initially installed with schema version 8001.');
        // Set the installed schema version to one less than the current update.
        drupal_set_installed_schema_version('update_script_test', $schema_version - 1);
        $schema_version = drupal_get_installed_schema_version('update_script_test', TRUE);
        $this->assertEqual($schema_version, 8000, 'update_script_test schema version overridden to 8000.');
        // Click through update.php with 'administer software updates' permission.
        $this->drupalLogin($this->updateUser);
        if ($maintenance_mode) {
            $this->assertText('Operating in maintenance mode.');
        }
        else {
            $this->assertNoText('Operating in maintenance mode.');
        }
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        $this->clickLink(t('Apply pending updates'));
        $this->checkForMetaRefresh();
        // Verify that updates were completed successfully.
        $this->assertText('Updates were attempted.');
        $this->assertSession()
            ->linkExists('site');
        $this->assertText('The update_script_test_update_8001() update was executed successfully.');
        // Verify that no 7.x updates were run.
        $this->assertNoText('The update_script_test_update_7200() update was executed successfully.');
        $this->assertNoText('The update_script_test_update_7201() update was executed successfully.');
        // Verify that there are no links to different parts of the workflow.
        $this->assertSession()
            ->linkNotExists('Administration pages');
        $this->assertEmpty($this->xpath('//main//a[contains(@href, :href)]', [
            ':href' => 'update.php',
        ]));
        $this->assertSession()
            ->linkNotExists('logged');
        // Verify the front page can be visited following the upgrade.
        $this->clickLink('Front page');
        $this->assertSession()
            ->statusCodeEquals(200);
    }
    
    /**
     * Returns the Drupal 7 system table schema.
     */
    public function getSystemSchema() {
        return [
            'description' => "A list of all modules, themes, and theme engines that are or have been installed in Drupal's file system.",
            'fields' => [
                'filename' => [
                    'description' => 'The path of the primary file for this item, relative to the Drupal root; e.g. modules/node/node.module.',
                    'type' => 'varchar',
                    'length' => 255,
                    'not null' => TRUE,
                    'default' => '',
                ],
                'name' => [
                    'description' => 'The name of the item; e.g. node.',
                    'type' => 'varchar',
                    'length' => 255,
                    'not null' => TRUE,
                    'default' => '',
                ],
                'type' => [
                    'description' => 'The type of the item, either module, theme, or theme_engine.',
                    'type' => 'varchar',
                    'length' => 12,
                    'not null' => TRUE,
                    'default' => '',
                ],
                'owner' => [
                    'description' => "A theme's 'parent' . Can be either a theme or an engine.",
                    'type' => 'varchar',
                    'length' => 255,
                    'not null' => TRUE,
                    'default' => '',
                ],
                'status' => [
                    'description' => 'Boolean indicating whether or not this item is enabled.',
                    'type' => 'int',
                    'not null' => TRUE,
                    'default' => 0,
                ],
                'bootstrap' => [
                    'description' => "Boolean indicating whether this module is loaded during Drupal's early bootstrapping phase (e.g. even before the page cache is consulted).",
                    'type' => 'int',
                    'not null' => TRUE,
                    'default' => 0,
                ],
                'schema_version' => [
                    'description' => "The module's database schema version number. -1 if the module is not installed (its tables do not exist); \\Drupal::CORE_MINIMUM_SCHEMA_VERSION or the largest N of the module's hook_update_N() function that has either been run or existed when the module was first installed.",
                    'type' => 'int',
                    'not null' => TRUE,
                    'default' => -1,
                    'size' => 'small',
                ],
                'weight' => [
                    'description' => "The order in which this module's hooks should be invoked relative to other modules. Equal-weighted modules are ordered by name.",
                    'type' => 'int',
                    'not null' => TRUE,
                    'default' => 0,
                ],
                'info' => [
                    'description' => "A serialized array containing information from the module's .info file; keys can include name, description, package, version, core, dependencies, and php.",
                    'type' => 'blob',
                    'not null' => FALSE,
                ],
            ],
            'primary key' => [
                'filename',
            ],
            'indexes' => [
                'system_list' => [
                    'status',
                    'bootstrap',
                    'type',
                    'weight',
                    'name',
                ],
                'type_name' => [
                    'type',
                    'name',
                ],
            ],
        ];
    }
    
    /**
     * Asserts that an installed extension's config setting is correct.
     *
     * @param string $extension_type
     *   The extension type, either 'module' or 'theme'.
     * @param string $extension_machine_name
     *   The extension machine name.
     */
    protected function assertInstalledExtensionConfig($extension_type, $extension_machine_name) {
        $extension_config = $this->container
            ->get('config.factory')
            ->getEditable('core.extension');
        $this->assertSame(0, $extension_config->get("{$extension_type}.{$extension_machine_name}"));
    }
    
    /**
     * Asserts a particular error is not shown on update and status report pages.
     *
     * @param string $unexpected_error_text
     *   The error text that should not be shown.
     * @param string $extension_type
     *   The extension type, either 'module' or 'theme'.
     * @param string $extension_machine_name
     *   The extension machine name.
     *
     * @throws \Behat\Mink\Exception\ResponseTextException
     */
    protected function assertUpdateWithNoError($unexpected_error_text, $extension_type, $extension_machine_name) {
        $assert_session = $this->assertSession();
        $this->drupalGet($this->statusReportUrl);
        $this->assertSession()
            ->pageTextNotContains($unexpected_error_text);
        $this->drupalGet($this->updateUrl, [
            'external' => TRUE,
        ]);
        $this->assertSession()
            ->pageTextNotContains($unexpected_error_text);
        $this->updateRequirementsProblem();
        $this->clickLink(t('Continue'));
        $assert_session->pageTextContains('No pending updates.');
        $this->assertInstalledExtensionConfig($extension_type, $extension_machine_name);
    }
    
    /**
     * Asserts an error is shown on the update and status report pages.
     *
     * @param string $expected_error_text
     *   The expected error text.
     * @param string $extension_type
     *   The extension type, either 'module' or 'theme'.
     * @param string $extension_machine_name
     *   The extension machine name.
     *
     * @throws \Behat\Mink\Exception\ExpectationException
     * @throws \Behat\Mink\Exception\ResponseTextException
     */
    protected function assertErrorOnUpdate($expected_error_text, $extension_type, $extension_machine_name) {
        $assert_session = $this->assertSession();
        $this->drupalGet($this->statusReportUrl);
        $this->assertSession()
            ->pageTextContains($expected_error_text);
        // Reload the update page to ensure the extension with the breaking values
        // has not been uninstalled or otherwise affected.
        for ($reload = 0; $reload <= 1; $reload++) {
            $this->drupalGet($this->updateUrl, [
                'external' => TRUE,
            ]);
            $this->assertSession()
                ->pageTextContains($expected_error_text);
            $assert_session->linkNotExists('Continue');
        }
        $this->assertInstalledExtensionConfig($extension_type, $extension_machine_name);
    }

}