--- /dev/null
+<?php
+
+namespace Drupal\Tests\system\Functional\Theme;
+
+use Drupal\Component\Serialization\Json;
+use Drupal\Tests\BrowserTestBase;
+use Symfony\Cmf\Component\Routing\RouteObjectInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Tests low-level theme functions.
+ *
+ * @group Theme
+ */
+class ThemeTest extends BrowserTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['theme_test', 'node'];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ \Drupal::service('theme_handler')->install(['test_theme']);
+ }
+
+ /**
+ * Ensures preprocess functions run even for suggestion implementations.
+ *
+ * The theme hook used by this test has its base preprocess function in a
+ * separate file, so this test also ensures that that file is correctly loaded
+ * when needed.
+ */
+ public function testPreprocessForSuggestions() {
+ // Test with both an unprimed and primed theme registry.
+ drupal_theme_rebuild();
+ for ($i = 0; $i < 2; $i++) {
+ $this->drupalGet('theme-test/suggestion');
+ $this->assertText('Theme hook implementor=test_theme_theme_test__suggestion(). Foo=template_preprocess_theme_test', 'Theme hook suggestion ran with data available from a preprocess function for the base hook.');
+ }
+ }
+
+ /**
+ * Tests the priority of some theme negotiators.
+ */
+ public function testNegotiatorPriorities() {
+ $this->drupalGet('theme-test/priority');
+
+ // Ensure that the custom theme negotiator was not able to set the theme.
+ $this->assertNoText('Theme hook implementor=test_theme_theme_test__suggestion(). Foo=template_preprocess_theme_test', 'Theme hook suggestion ran with data available from a preprocess function for the base hook.');
+ }
+
+ /**
+ * Ensures that non-HTML requests never initialize themes.
+ */
+ public function testThemeOnNonHtmlRequest() {
+ $this->drupalGet('theme-test/non-html');
+ $json = Json::decode($this->getSession()->getPage()->getContent());
+ $this->assertFalse($json['theme_initialized']);
+ }
+
+ /**
+ * Ensure page-front template suggestion is added when on front page.
+ */
+ public function testFrontPageThemeSuggestion() {
+ // Set the current route to user.login because theme_get_suggestions() will
+ // query it to see if we are on the front page.
+ $request = Request::create('/user/login');
+ $request->attributes->set(RouteObjectInterface::ROUTE_NAME, 'user.login');
+ $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/user/login'));
+ \Drupal::requestStack()->push($request);
+ $this->config('system.site')->set('page.front', '/user/login')->save();
+ $suggestions = theme_get_suggestions(['user', 'login'], 'page');
+ // Set it back to not annoy the batch runner.
+ \Drupal::requestStack()->pop();
+ $this->assertTrue(in_array('page__front', $suggestions), 'Front page template was suggested.');
+ }
+
+ /**
+ * Ensures a theme's .info.yml file is able to override a module CSS file from being added to the page.
+ *
+ * @see test_theme.info.yml
+ */
+ public function testCSSOverride() {
+ // Reuse the same page as in testPreprocessForSuggestions(). We're testing
+ // what is output to the HTML HEAD based on what is in a theme's .info.yml
+ // file, so it doesn't matter what page we get, as long as it is themed with
+ // the test theme. First we test with CSS aggregation disabled.
+ $config = $this->config('system.performance');
+ $config->set('css.preprocess', 0);
+ $config->save();
+ $this->drupalGet('theme-test/suggestion');
+ $this->assertNoText('js.module.css', 'The theme\'s .info.yml file is able to override a module CSS file from being added to the page.');
+
+ // Also test with aggregation enabled, simply ensuring no PHP errors are
+ // triggered during drupal_build_css_cache() when a source file doesn't
+ // exist. Then allow remaining tests to continue with aggregation disabled
+ // by default.
+ $config->set('css.preprocess', 1);
+ $config->save();
+ $this->drupalGet('theme-test/suggestion');
+ $config->set('css.preprocess', 0);
+ $config->save();
+ }
+
+ /**
+ * Ensures a themes template is overridable based on the 'template' filename.
+ */
+ public function testTemplateOverride() {
+ $this->config('system.theme')
+ ->set('default', 'test_theme')
+ ->save();
+ $this->drupalGet('theme-test/template-test');
+ $this->assertText('Success: Template overridden.', 'Template overridden by defined \'template\' filename.');
+ }
+
+ /**
+ * Ensures a theme template can override a theme function.
+ */
+ public function testFunctionOverride() {
+ $this->drupalGet('theme-test/function-template-overridden');
+ $this->assertText('Success: Template overrides theme function.', 'Theme function overridden by test_theme template.');
+ }
+
+ /**
+ * Tests that the page variable is not prematurely flattened.
+ *
+ * Some modules check the page array in template_preprocess_html(), so we
+ * ensure that it has not been rendered prematurely.
+ */
+ public function testPreprocessHtml() {
+ $this->drupalGet('');
+ $attributes = $this->xpath('/body[@theme_test_page_variable="Page variable is an array."]');
+ $this->assertTrue(count($attributes) == 1, 'In template_preprocess_html(), the page variable is still an array (not rendered yet).');
+ $this->assertText('theme test page bottom markup', 'Modules are able to set the page bottom region.');
+ }
+
+ /**
+ * Tests that region attributes can be manipulated via preprocess functions.
+ */
+ public function testRegionClass() {
+ \Drupal::service('module_installer')->install(['block', 'theme_region_test']);
+
+ // Place a block.
+ $this->drupalPlaceBlock('system_main_block');
+ $this->drupalGet('');
+ $elements = $this->cssSelect(".region-sidebar-first.new_class");
+ $this->assertEqual(count($elements), 1, 'New class found.');
+ }
+
+ /**
+ * Ensures suggestion preprocess functions run for default implementations.
+ *
+ * The theme hook used by this test has its base preprocess function in a
+ * separate file, so this test also ensures that that file is correctly loaded
+ * when needed.
+ */
+ public function testSuggestionPreprocessForDefaults() {
+ $this->config('system.theme')->set('default', 'test_theme')->save();
+ // Test with both an unprimed and primed theme registry.
+ drupal_theme_rebuild();
+ for ($i = 0; $i < 2; $i++) {
+ $this->drupalGet('theme-test/preprocess-suggestions');
+ $items = $this->cssSelect('.suggestion');
+ $expected_values = [
+ 'Suggestion',
+ 'Kitten',
+ 'Monkey',
+ 'Kitten',
+ 'Flamingo',
+ ];
+ foreach ($expected_values as $key => $value) {
+ $this->assertEqual((string) $value, $items[$key]->getText());
+ }
+ }
+ }
+
+}
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