class CssOptimizerUnitTest

class CssOptimizerUnitTest extends KernelTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'advagg',
    ];
    
    /**
     * The Optimizer.
     *
     * @var \Drupal\advagg\Asset\CssOptimizer
     */
    protected $optimizer;
    
    /**
     * The directory for comparison/getting CSS files from.
     *
     * @var string
     */
    protected $dir;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->installConfig('advagg');
        $this->optimizer = \Drupal::service('advagg.optimizer.css');
        $this->dir = base_path() . 'modules/contrib/advagg/tests/src/Kernel/Asset/';
    }
    
    /**
     * Provides data for the url update test.
     */
    public function providerTestUrlUpdate() {
        return [
            [
                'url_test_same_dir.css',
                $this->dir . 'css_test_files/icon-foo.svg',
            ],
            [
                'url_test_child_dir.css',
                $this->dir . 'css_test_files/images/icon-foo.svg',
            ],
            [
                'url_test_parent_dir.css',
                $this->dir . 'css_test_files/../images/icon-foo.svg',
            ],
        ];
    }
    
    /**
     * Tests the urlUpdate() method.
     *
     * @param string $file
     *   The file to test.
     * @param string $expected
     *   The expected url string.
     *
     * @dataProvider providerTestUrlUpdate
     */
    public function testUrlUpdate($file, $expected) {
        $path = $this->dir . 'css_test_files/' . $file;
        $absolute_path = dirname(__FILE__) . '/css_test_files/';
        $contents = file_get_contents($absolute_path . $file);
        $replaced_urls = $this->optimizer
            ->updateUrls($contents, $path);
        $this->assertNotFalse(strstr($replaced_urls, $expected));
    }

}