class ContentPreprocessTest

class ContentPreprocessTest extends UnitTestCase {
  
  /**
   * @covers ::isLatestVersionPage
   * @dataProvider routeNodeProvider
   */
  public function testIsLatestVersionPage($route_name, $route_nid, $check_nid, $result, $message) {
    $content_preprocess = new ContentPreprocess($this->setupCurrentRouteMatch($route_name, $route_nid));
    $node = $this->setupNode($check_nid);
    $this->assertEquals($result, $content_preprocess->isLatestVersionPage($node), $message);
  }
  
  /**
   * Data provider for self::testIsLatestVersionPage().
   */
  public function routeNodeProvider() {
    return [
      [
        'entity.node.canonical',
        1,
        1,
        FALSE,
        'Not on the latest version tab route.',
      ],
      [
        'entity.node.latest_version',
        1,
        1,
        TRUE,
        'On the latest version tab route, with the route node.',
      ],
      [
        'entity.node.latest_version',
        1,
        2,
        FALSE,
        'On the latest version tab route, with a different node.',
      ],
    ];
  }
  
  /**
   * Mock the current route matching object.
   *
   * @param string $route_name
   *   The route to mock.
   * @param int $nid
   *   The node ID for mocking.
   *
   * @return \Drupal\Core\Routing\CurrentRouteMatch
   *   The mocked current route match object.
   */
  protected function setupCurrentRouteMatch($route_name, $nid) {
    $route_match = $this->prophesize(CurrentRouteMatch::class);
    $route_match->getRouteName()
      ->willReturn($route_name);
    $route_match->getParameter('node')
      ->willReturn($this->setupNode($nid));
    return $route_match->reveal();
  }
  
  /**
   * Mock a node object.
   *
   * @param int $nid
   *   The node ID to mock.
   *
   * @return \Drupal\node\Entity\Node
   *   The mocked node.
   */
  protected function setupNode($nid) {
    $node = $this->prophesize(Node::class);
    $node->id()
      ->willReturn($nid);
    return $node->reveal();
  }

}