class LibraryDiscoveryTest

class LibraryDiscoveryTest extends UnitTestCase {
    
    /**
     * The tested library discovery service.
     *
     * @var \Drupal\Core\Asset\LibraryDiscovery
     */
    protected $libraryDiscovery;
    
    /**
     * The mocked library discovery cache collector.
     *
     * @var \Drupal\Core\Cache\CacheCollectorInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $libraryDiscoveryCollector;
    
    /**
     * The cache tags invalidator.
     *
     * @var \Drupal\Core\Cache\CacheTagsInvalidatorInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $cacheTagsInvalidator;
    
    /**
     * Test library data.
     *
     * @var array
     */
    protected $libraryData = [
        'test_1' => [
            'js' => [],
            'css' => [
                'foo.css' => [],
            ],
        ],
        'test_2' => [
            'js' => [
                'bar.js' => [],
            ],
            'css' => [],
        ],
        'test_3' => [
            'js' => [
                'baz.js' => [],
            ],
            'css' => [],
            'deprecated' => 'The "%library_id%" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use the test_2 library instead. See https://www.example.com',
        ],
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->cacheTagsInvalidator = $this->createMock('Drupal\\Core\\Cache\\CacheTagsInvalidatorInterface');
        $this->libraryDiscoveryCollector = $this->getMockBuilder('Drupal\\Core\\Asset\\LibraryDiscoveryCollector')
            ->disableOriginalConstructor()
            ->getMock();
        $this->libraryDiscovery = new LibraryDiscovery($this->libraryDiscoveryCollector, $this->cacheTagsInvalidator);
        $this->libraryDiscoveryCollector
            ->expects($this->once())
            ->method('get')
            ->with('test')
            ->willReturn($this->libraryData);
    }
    
    /**
     * @covers ::getLibrariesByExtension
     */
    public function testGetLibrariesByExtension() {
        $this->libraryDiscovery
            ->getLibrariesByExtension('test');
        // Verify that subsequent calls don't trigger hook_library_info_alter()
        // and hook_js_settings_alter() invocations, nor do they talk to the
        // collector again. This ensures that the alterations made by
        // hook_library_info_alter() and hook_js_settings_alter() implementations
        // are statically cached, as desired.
        $this->libraryDiscovery
            ->getLibraryByName('test', 'test_1');
        $this->libraryDiscovery
            ->getLibrariesByExtension('test');
    }
    
    /**
     * Tests getting a library by name.
     *
     * @covers ::getLibraryByName
     */
    public function testGetLibraryByName() {
        $this->assertSame($this->libraryData['test_1'], $this->libraryDiscovery
            ->getLibraryByName('test', 'test_1'));
    }
    
    /**
     * Tests getting a deprecated library.
     */
    public function testAssetLibraryDeprecation() {
        $previous_error_handler = set_error_handler(function ($severity, $message, $file, $line) use (&$previous_error_handler) {
            // Convert deprecation error into a catchable exception.
            if ($severity === E_USER_DEPRECATED) {
                throw new \ErrorException($message, 0, $severity, $file, $line);
            }
            if ($previous_error_handler) {
                return $previous_error_handler($severity, $message, $file, $line);
            }
        });
        try {
            $this->libraryDiscovery
                ->getLibraryByName('test', 'test_3');
            $this->fail('No deprecation error triggered.');
        } catch (\ErrorException $e) {
            $this->assertSame('The "test/test_3" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use the test_2 library instead. See https://www.example.com', $e->getMessage());
        }
        restore_error_handler();
    }

}