class AcceptHeaderMatcherTest

class AcceptHeaderMatcherTest extends UnitTestCase {

  /**
   * A collection of shared fixture data for tests.
   *
   * @var \Drupal\Tests\Core\Routing\RoutingFixtures
   */
  protected $fixtures;

  /**
   * The matcher object that is going to be tested.
   *
   * @var \Drupal\accept_header_routing_test\Routing\AcceptHeaderMatcher
   */
  protected $matcher;

  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->fixtures = new RoutingFixtures();
    $this->matcher = new AcceptHeaderMatcher();
  }

  /**
   * Provides data for the Accept header filtering test.
   *
   * @see Drupal\Tests\Core\Routing\AcceptHeaderMatcherTest::testAcceptFiltering()
   */
  public static function acceptFilterProvider() {
    return [
      // Check that JSON routes get filtered and prioritized correctly.
      [
        'application/json, text/xml;q=0.9',
        'json',
        'route_c',
        'route_e',
      ],
      // Tests a JSON request with alternative JSON MIME type Accept header.
      [
        'application/x-json, text/xml;q=0.9',
        'json',
        'route_c',
        'route_e',
      ],
      // Tests a standard HTML request.
      [
        'text/html, text/xml;q=0.9',
        'html',
        'route_e',
        'route_c',
      ],
    ];
  }

  /**
   * Tests that requests using Accept headers get filtered correctly.
   *
   * @param string $accept_header
   *   The HTTP Accept header value of the request.
   * @param string $format
   *   The request format.
   * @param string $included_route
   *   The route name that should survive the filter and be ranked first.
   * @param string $excluded_route
   *   The route name that should be filtered out during matching.
   *
   * @dataProvider acceptFilterProvider
   */
  public function testAcceptFiltering($accept_header, $format, $included_route, $excluded_route) {
    $collection = $this->fixtures
      ->sampleRouteCollection();
    $request = Request::create('path/two', 'GET');
    $request->headers
      ->set('Accept', $accept_header);
    $request
      ->setRequestFormat($format);
    $routes = $this->matcher
      ->filter($collection, $request);
    $this
      ->assertCount(4, $routes, 'The correct number of routes was found.');
    $this
      ->assertNotNull($routes
      ->get($included_route), "Route {$included_route} was found when matching {$accept_header}.");
    $this
      ->assertNull($routes
      ->get($excluded_route), "Route {$excluded_route} was not found when matching {$accept_header}.");
    foreach ($routes as $name => $route) {
      $this
        ->assertEquals($name, $included_route, "Route {$included_route} is the first one in the collection when matching {$accept_header}.");
      break;
    }
  }

  /**
   * Confirms that the AcceptHeaderMatcher throws an exception for no-route.
   */
  public function testNoRouteFound() {

    // Remove the sample routes that would match any method.
    $routes = $this->fixtures
      ->sampleRouteCollection();
    $routes
      ->remove('route_a');
    $routes
      ->remove('route_b');
    $routes
      ->remove('route_c');
    $routes
      ->remove('route_d');
    $request = Request::create('path/two', 'GET');
    $request->headers
      ->set('Accept', 'application/json, text/xml;q=0.9');
    $request
      ->setRequestFormat('json');
    $this
      ->expectException(NotAcceptableHttpException::class);
    $this
      ->expectExceptionMessage('No route found for the specified formats application/json text/xml');
    $this->matcher
      ->filter($routes, $request);
  }

}