--- /dev/null
+<?php
+
+namespace Drupal\locale\Tests;
+
+use Drupal\Component\Render\FormattableMarkup;
+use Drupal\Component\Utility\SafeMarkup;
+
+/**
+ * Tests for the user interface of project interface translations.
+ *
+ * @group locale
+ */
+class LocaleUpdateInterfaceTest extends LocaleUpdateBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['locale_test_translate'];
+
+ /**
+ * {@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);
+ }
+
+ /**
+ * Tests the user interfaces of the interface translation update system.
+ *
+ * Testing the Available updates summary on the side wide status page and the
+ * Available translation updates page.
+ */
+ public function testInterface() {
+ // No language added.
+ // Check status page and Available translation updates page.
+ $this->drupalGet('admin/reports/status');
+ $this->assertNoText(t('Translation update status'), 'No status message');
+
+ $this->drupalGet('admin/reports/translations');
+ $this->assertRaw(t('No translatable languages available. <a href=":add_language">Add a language</a> first.', [':add_language' => \Drupal::url('entity.configurable_language.collection')]), 'Language message');
+
+ // Add German language.
+ $this->addLanguage('de');
+
+ // Override Drupal core translation status as 'up-to-date'.
+ $status = locale_translation_get_status();
+ $status['drupal']['de']->type = 'current';
+ \Drupal::keyValue('locale.translation_status')->set('drupal', $status['drupal']);
+
+ // One language added, all translations up to date.
+ $this->drupalGet('admin/reports/status');
+ $this->assertText(t('Translation update status'), 'Status message');
+ $this->assertText(t('Up to date'), 'Translations up to date');
+ $this->drupalGet('admin/reports/translations');
+ $this->assertText(t('All translations up to date.'), 'Translations up to date');
+
+ // Set locale_test_translate module to have a local translation available.
+ $status = locale_translation_get_status();
+ $status['locale_test_translate']['de']->type = 'local';
+ \Drupal::keyValue('locale.translation_status')->set('locale_test_translate', $status['locale_test_translate']);
+
+ // Check if updates are available for German.
+ $this->drupalGet('admin/reports/status');
+ $this->assertText(t('Translation update status'), 'Status message');
+ $this->assertRaw(t('Updates available for: @languages. See the <a href=":updates">Available translation updates</a> page for more information.', ['@languages' => t('German'), ':updates' => \Drupal::url('locale.translate_status')]), 'Updates available message');
+ $this->drupalGet('admin/reports/translations');
+ $this->assertText(t('Updates for: @modules', ['@modules' => 'Locale test translate']), 'Translations available');
+
+ // Set locale_test_translate module to have a dev release and no
+ // translation found.
+ $status = locale_translation_get_status();
+ $status['locale_test_translate']['de']->version = '1.3-dev';
+ $status['locale_test_translate']['de']->type = '';
+ \Drupal::keyValue('locale.translation_status')->set('locale_test_translate', $status['locale_test_translate']);
+
+ // Check if no updates were found.
+ $this->drupalGet('admin/reports/status');
+ $this->assertText(t('Translation update status'), 'Status message');
+ $this->assertRaw(t('Missing translations for: @languages. See the <a href=":updates">Available translation updates</a> page for more information.', ['@languages' => t('German'), ':updates' => \Drupal::url('locale.translate_status')]), 'Missing translations message');
+ $this->drupalGet('admin/reports/translations');
+ $this->assertText(t('Missing translations for one project'), 'No translations found');
+ $release_details = new FormattableMarkup('@module (@version). @info', [
+ '@module' => 'Locale test translate',
+ '@version' => '1.3-dev',
+ '@info' => t('File not found at %local_path', ['%local_path' => 'core/modules/locale/tests/test.de.po'])
+ ]);
+ $this->assertRaw($release_details->__toString(), 'Release details');
+
+ // Override Drupal core translation status as 'no translations found'.
+ $status = locale_translation_get_status();
+ $status['drupal']['de']->type = '';
+ $status['drupal']['de']->timestamp = 0;
+ $status['drupal']['de']->version = '8.1.1';
+ \Drupal::keyValue('locale.translation_status')->set('drupal', $status['drupal']);
+
+ // Check if Drupal core is not translated.
+ $this->drupalGet('admin/reports/translations');
+ $this->assertText(t('Missing translations for 2 projects'), 'No translations found');
+ $this->assertText(t('@module (@version).', ['@module' => t('Drupal core'), '@version' => '8.1.1']), 'Release details');
+
+ // Override Drupal core translation status as 'translations available'.
+ $status = locale_translation_get_status();
+ $status['drupal']['de']->type = 'local';
+ $status['drupal']['de']->files['local']->timestamp = REQUEST_TIME;
+ $status['drupal']['de']->files['local']->info['version'] = '8.1.1';
+ \Drupal::keyValue('locale.translation_status')->set('drupal', $status['drupal']);
+
+ // Check if translations are available for Drupal core.
+ $this->drupalGet('admin/reports/translations');
+ $this->assertText(t('Updates for: @project', ['@project' => t('Drupal core')]), 'Translations found');
+ $this->assertText(SafeMarkup::format('@module (@date)', ['@module' => t('Drupal core'), '@date' => format_date(REQUEST_TIME, 'html_date')]), 'Core translation update');
+ $update_button = $this->xpath('//input[@type="submit"][@value="' . t('Update translations') . '"]');
+ $this->assertTrue($update_button, 'Update translations button');
+ }
+
+}