function ThemeTest::testCSSOverride

Ensures a theme's .info.yml file is able to override a module CSS file from being added to the page.

See also

test_theme.info.yml

File

core/modules/system/tests/src/Functional/Theme/ThemeTest.php, line 109

Class

ThemeTest

Tests low-level theme functions.

Namespace

Code

public function testCSSOverride() : void {
    // 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');
    // We add a "?" to the assertion, because drupalSettings may include
    // information about the file; we only really care about whether it appears
    // in a LINK or STYLE tag, for which Drupal always adds a query string for
    // cache control.
    $this->assertSession()
        ->responseNotContains('js.module.css?');
    // 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();
}