Issue #2807949 by kunal.sachdev, tim.plunkett, tedbow, Dropa: update.module is...

<?php

namespace Drupal\Tests\update\Kernel;

use Drupal\KernelTests\KernelTestBase;

/**

 * Tests the Update module storage is cleared correctly.

 *

 * @group update

 */

class UpdateStorageTest extends KernelTestBase {

  /**

   * {@inheritdoc}

   */

  protected static $modules = [

    'update',

  ];

  /**

   * Tests the Update module storage is cleared correctly.

   */

  public function testUpdateStorage() {

    // Setting values in both key stores, then installing the module and

    // testing if these key values are cleared.

    $keyvalue_update = $this->container->get('keyvalue.expirable')->get('update');

    $keyvalue_update->set('key', 'some value');

    $keyvalue_update_available_release = $this->container->get('keyvalue.expirable')->get('update_available_release');

    $keyvalue_update_available_release->set('key', 'some value');

    $this->container->get('module_installer')->install(['help']);

    $this->assertNull($keyvalue_update->get('key'));

    $this->assertNull($keyvalue_update_available_release->get('key'));

    // Setting new values in both key stores, then uninstalling the module and

    // testing if these new key values are cleared.

    $keyvalue_update->set('another_key', 'some value');

    $keyvalue_update_available_release->set('another_key', 'some value');

    $this->container->get('module_installer')->uninstall(['help']);

    $this->assertNull($keyvalue_update->get('another_key'));

    $this->assertNull($keyvalue_update_available_release->get('another_key'));

  }

}

use Drupal\Core\File\Exception\FileException;

use Drupal\Core\Link;

use Drupal\Core\Url;

use Drupal\Core\Form\FormStateInterface;

use Drupal\Core\Routing\RouteMatchInterface;

use Drupal\Core\Site\Settings;

use Drupal\update\UpdateFetcherInterface;

}

/**

 * Implements hook_form_FORM_ID_alter() for system_modules().

 * Implements hook_modules_installed().

 *

 * Adds a form submission handler to the system modules form, so that if a site

 * admin saves the form, we invalidate the information of available updates.

 *

 * @see _update_cache_clear()

 * If modules are installed, we invalidate the information of available updates.

 */

function update_form_system_modules_alter(&$form, FormStateInterface $form_state) {

  $form['#submit'][] = 'update_storage_clear_submit';

function update_modules_installed($modules) {

  // Clear all update module data.

  update_storage_clear();

}

/**

 * Form submission handler for system_modules().

 * Implements hook_modules_uninstalled().

 *

 * @see update_form_system_modules_alter()

 * If modules are uninstalled, we invalidate the information of available updates.

 */

function update_storage_clear_submit($form, FormStateInterface $form_state) {

function update_modules_uninstalled($modules) {

  // Clear all update module data.

  update_storage_clear();

}