Fix tests coverage

src/Middleware/Dispatcher.php

@@ -14,7 +14,7 @@ class Dispatcher implements MiddlewareInterface, RequestHandlerInterface
 {
     use ResolvesMiddlewareTrait;
 
-    protected RequestHandlerInterface $next;
+    protected ?RequestHandlerInterface $next = null;
 
     /**
      * @param MiddlewareInterface[]|string[] $stack

src/Middleware/RequestHandler.php

@@ -6,7 +6,6 @@ use Engelsystem\Application;
 use Engelsystem\Controllers\BaseController;
 use Engelsystem\Helpers\Authenticator;
 use Engelsystem\Http\Exceptions\HttpForbidden;
-use InvalidArgumentException;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\MiddlewareInterface;
@@ -28,6 +27,7 @@ class RequestHandler implements MiddlewareInterface
     {
         $requestHandler = $request->getAttribute('route-request-handler');
 
+        /** @var CallableHandler|MiddlewareInterface|RequestHandlerInterface $requestHandler */
         $requestHandler = $this->resolveRequestHandler($requestHandler);
 
         if ($requestHandler instanceof CallableHandler) {
@@ -42,11 +42,11 @@ class RequestHandler implements MiddlewareInterface
             return $requestHandler->process($request, $handler);
         }
 
-        if ($requestHandler instanceof RequestHandlerInterface) {
-            return $requestHandler->handle($request);
-        }
-
-        throw new InvalidArgumentException('Unable to process request handler of type ' . gettype($requestHandler));
+        /**
+         * Is RequestHandlerInterface
+         * @see RequestHandlerInterface
+         */
+        return $requestHandler->handle($request);
     }
 
     /**

src/Middleware/ResolvesMiddlewareTrait.php

@@ -42,7 +42,7 @@ trait ResolvesMiddlewareTrait
     }
 
     /**
-     * Checks if the given object is a middleware or middleware or request handler
+     * Checks if the given object is a middleware or request handler
      */
     protected function isMiddleware(mixed $middleware): bool
     {

tests/Unit/Middleware/DispatcherTest.php

@@ -3,8 +3,12 @@
 namespace Engelsystem\Test\Unit\Middleware;
 
 use Engelsystem\Application;
+use Engelsystem\Http\Request;
+use Engelsystem\Http\Response;
 use Engelsystem\Middleware\Dispatcher;
-use Error;
+use Engelsystem\Test\Unit\Middleware\Stub\ReturnResponseMiddlewareHandler;
+use InvalidArgumentException;
+use LogicException;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\ResponseInterface;
@@ -122,7 +126,7 @@ class DispatcherTest extends TestCase
         /** @var ServerRequestInterface|MockObject $request */
         $request = $this->createMock(ServerRequestInterface::class);
 
-        $this->expectException(Error::class);
+        $this->expectException(LogicException::class);
 
         $dispatcher = new Dispatcher();
         $dispatcher->handle($request);
@@ -163,6 +167,17 @@ class DispatcherTest extends TestCase
         $dispatcher->handle($request);
     }
 
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::handle
+     */
+    public function testHandleCallResolveInvalidTypeResolved(): void
+    {
+        $instance = new Dispatcher([new ReturnResponseMiddlewareHandler(new Response())]);
+
+        $this->expectException(InvalidArgumentException::class);
+        $instance->handle(new Request());
+    }
+
     /**
      * @covers \Engelsystem\Middleware\Dispatcher::setContainer
      */