Added some more tests for Dispatcher and CallableMiddleware

src/TestingHelper/Middleware/CallableMiddleware.php

@@ -95,7 +95,7 @@ private function execute($callable, array $arguments = []): ResponseInterface
                 $response = $instance->createResponse();
             } else {
                 throw new UnexpectedValueException(
-                    'The value returned must be scalar or an object with __toString method'
+                    'The value returned must be "scalar" or an object with "__toString" method.'
                 );
             }
 

tests/Middleware/CallableMiddlewareTest.php

@@ -2,13 +2,17 @@
 declare(strict_types=1);
 namespace Narrowspark\TestingHelper\Tests\Middleware;
 
+use Http\Factory\Guzzle\ResponseFactory;
+use Http\Factory\Guzzle\ServerRequestFactory;
 use Narrowspark\TestingHelper\Middleware\CallableMiddleware;
+use Narrowspark\TestingHelper\Middleware\RequestHandlerMiddleware;
 use PHPUnit\Framework\TestCase;
 
 class CallableMiddlewareTest extends TestCase
 {
     /**
      * @expectedException \RuntimeException
+     * @expectedExceptionMessage Class name don't implements [Interop\Http\Factory\ResponseFactoryInterface] interface; [Narrowspark\TestingHelper\Tests\Middleware\CallableMiddlewareTest] given.
      */
     public function testConstructorThrowErrorOnWrongResponseFactory(): void
     {
@@ -18,4 +22,44 @@ function (): void {
             CallableMiddlewareTest::class
         );
     }
+
+    /**
+     * @expectedException \UnexpectedValueException
+     * @expectedExceptionMessage The value returned must be "scalar" or an object with "__toString" method.
+     */
+    public function testMiddlewareThrowErrorOnScalarType(): void
+    {
+        $middleware = new CallableMiddleware(
+            function () {
+                return new class() {
+                };
+            },
+            ResponseFactory::class
+        );
+
+        $middleware->process(
+            (new ServerRequestFactory())->createServerRequest('GET', '/'),
+            new RequestHandlerMiddleware(function (): void {
+            })
+        );
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     * @expectedExceptionMessage No ResponseFactory class found.
+     */
+    public function testConstructorThrowErrorOnWrongResponseFactory2(): void
+    {
+        $middleware = new CallableMiddleware(
+            function () {
+                return '';
+            }
+        );
+
+        $middleware->process(
+            (new ServerRequestFactory())->createServerRequest('GET', '/'),
+            new RequestHandlerMiddleware(function (): void {
+            })
+        );
+    }
 }

tests/Middleware/DispatcherTest.php

@@ -27,6 +27,16 @@ protected function setUp(): void
         $this->serverRequest = (new ServerRequestFactory())->createServerRequest('GET', '/');
     }
 
+    /**
+     * @expectedException \LogicException
+     * @expectedExceptionMessage Unresolved request: middleware stack exhausted with no result.
+     */
+    public function testDispatcherWithEmptyStack(): void
+    {
+        $dispatcher = new Dispatcher([]);
+        $dispatcher->dispatch($this->serverRequest);
+    }
+
     public function testDispatcher(): void
     {
         $dispatcher = new Dispatcher([