diff --git a/tests/src/App/RouterTest.php b/tests/src/App/RouterTest.php
new file mode 100644
index 0000000000..5a573bda95
--- /dev/null
+++ b/tests/src/App/RouterTest.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Friendica\Test\src\App;
+
+use Friendica\App\Router;
+use PHPUnit\Framework\TestCase;
+
+class RouterTest extends TestCase
+{
+	public function testGetModuleClass()
+	{
+		$router = new Router();
+
+		$routeCollector = $router->getRouteCollector();
+		$routeCollector->addRoute(['GET'], '/', 'IndexModuleClassName');
+		$routeCollector->addRoute(['GET'], '/test', 'TestModuleClassName');
+		$routeCollector->addRoute(['GET'], '/test/sub', 'TestSubModuleClassName');
+		$routeCollector->addRoute(['GET'], '/optional[/option]', 'OptionalModuleClassName');
+		$routeCollector->addRoute(['GET'], '/variable/{var}', 'VariableModuleClassName');
+		$routeCollector->addRoute(['GET'], '/optionalvariable[/{option}]', 'OptionalVariableModuleClassName');
+		$routeCollector->addRoute(['POST', 'PUT', 'PATCH', 'DELETE', 'HEAD'], '/unsupported', 'UnsupportedMethodModuleClassName');
+
+		$this->assertEquals('IndexModuleClassName', $router->getModuleClass('/'));
+
+		$this->assertEquals('TestModuleClassName', $router->getModuleClass('/test'));
+		$this->assertNull($router->getModuleClass('/tes'));
+
+		$this->assertEquals('TestSubModuleClassName', $router->getModuleClass('/test/sub'));
+
+		$this->assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional'));
+		$this->assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional/option'));
+		$this->assertNull($router->getModuleClass('/optional/opt'));
+
+		$this->assertEquals('VariableModuleClassName', $router->getModuleClass('/variable/123abc'));
+		$this->assertNull($router->getModuleClass('/variable'));
+
+		$this->assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable'));
+		$this->assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable/123abc'));
+
+		$this->assertNull($router->getModuleClass('/unsupported'));
+	}
+}