--- /dev/null
+<?php
+
+namespace Drupal\locale\Tests;
+
+/**
+ * Tests for using cron to update project interface translations.
+ *
+ * @group locale
+ */
+class LocaleUpdateCronTest extends LocaleUpdateBase {
+
+ protected $batchOutput = [];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ $admin_user = $this->drupalCreateUser(['administer modules', 'administer site configuration', 'administer languages', 'access administration pages', 'translate interface']);
+ $this->drupalLogin($admin_user);
+ $this->addLanguage('de');
+ }
+
+ /**
+ * Tests interface translation update using cron.
+ */
+ public function testUpdateCron() {
+ // Set a flag to let the locale_test module replace the project data with a
+ // set of test projects.
+ \Drupal::state()->set('locale.test_projects_alter', TRUE);
+
+ // Setup local and remote translations files.
+ $this->setTranslationFiles();
+ $this->config('locale.settings')->set('translation.default_filename', '%project-%version.%language._po')->save();
+
+ // Update translations using batch to ensure a clean test starting point.
+ $this->drupalGet('admin/reports/translations/check');
+ $this->drupalPostForm('admin/reports/translations', [], t('Update translations'));
+
+ // Store translation status for comparison.
+ $initial_history = locale_translation_get_file_history();
+
+ // Prepare for test: Simulate new translations being available.
+ // Change the last updated timestamp of a translation file.
+ $contrib_module_two_uri = 'public://local/contrib_module_two-8.x-2.0-beta4.de._po';
+ touch(drupal_realpath($contrib_module_two_uri), REQUEST_TIME);
+
+ // Prepare for test: Simulate that the file has not been checked for a long
+ // time. Set the last_check timestamp to zero.
+ $query = db_update('locale_file');
+ $query->fields(['last_checked' => 0]);
+ $query->condition('project', 'contrib_module_two');
+ $query->condition('langcode', 'de');
+ $query->execute();
+
+ // Test: Disable cron update and verify that no tasks are added to the
+ // queue.
+ $edit = [
+ 'update_interval_days' => 0,
+ ];
+ $this->drupalPostForm('admin/config/regional/translate/settings', $edit, t('Save configuration'));
+
+ // Execute locale cron tasks to add tasks to the queue.
+ locale_cron();
+
+ // Check whether no tasks are added to the queue.
+ $queue = \Drupal::queue('locale_translation', TRUE);
+ $this->assertEqual($queue->numberOfItems(), 0, 'Queue is empty');
+
+ // Test: Enable cron update and check if update tasks are added to the
+ // queue.
+ // Set cron update to Weekly.
+ $edit = [
+ 'update_interval_days' => 7,
+ ];
+ $this->drupalPostForm('admin/config/regional/translate/settings', $edit, t('Save configuration'));
+
+ // Execute locale cron tasks to add tasks to the queue.
+ locale_cron();
+
+ // Check whether tasks are added to the queue.
+ $queue = \Drupal::queue('locale_translation', TRUE);
+ $this->assertEqual($queue->numberOfItems(), 3, 'Queue holds tasks for one project.');
+ $item = $queue->claimItem();
+ $queue->releaseItem($item);
+ $this->assertEqual($item->data[1][0], 'contrib_module_two', 'Queue holds tasks for contrib module one.');
+
+ // Test: Run cron for a second time and check if tasks are not added to
+ // the queue twice.
+ locale_cron();
+
+ // Check whether no more tasks are added to the queue.
+ $queue = \Drupal::queue('locale_translation', TRUE);
+ $this->assertEqual($queue->numberOfItems(), 3, 'Queue holds tasks for one project.');
+
+ // Ensure last checked is updated to a greater time than the initial value.
+ sleep(1);
+ // Test: Execute cron and check if tasks are executed correctly.
+ // Run cron to process the tasks in the queue.
+ $this->cronRun();
+
+ drupal_static_reset('locale_translation_get_file_history');
+ $history = locale_translation_get_file_history();
+ $initial = $initial_history['contrib_module_two']['de'];
+ $current = $history['contrib_module_two']['de'];
+ $this->assertTrue($current->timestamp > $initial->timestamp, 'Timestamp is updated');
+ $this->assertTrue($current->last_checked > $initial->last_checked, 'Last checked is updated');
+ }
+
+}