class ContentPreprocessTest

class ContentPreprocessTest extends UnitTestCase {
    
    /**
     * @covers ::isLatestVersionPage
     * @dataProvider routeNodeProvider
     */
    public function testIsLatestVersionPage($route_name, $route_nid, $check_nid, $result, $message) : void {
        $content_preprocess = new ContentPreprocess($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 static 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();
    }

}