added some tests to avoid regressions in the future

composer.lock

@@ -46,8 +46,8 @@
         {
             "package": "symfony/http-kernel",
             "version": "dev-master",
-            "source-reference": "538a38c4919a982c1f68ad129178a0e3bb78a4c5",
-            "commit-date": "1342173351"
+            "source-reference": "dc93ba8c91cb4d6de78bb32e9836cf32088f0626",
+            "commit-date": "1342174453"
         },
         {
             "package": "symfony/routing",

tests/Silex/Tests/ErrorHandlerTest.php

@@ -77,6 +77,34 @@ class ErrorHandlerTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals(404, $response->getStatusCode());
     }
 
+    public function testErrorHandlerMethodNotAllowedNoDebug()
+    {
+        $app = new Application();
+        $app['debug'] = false;
+
+        $app->get('/foo', function () { return 'foo'; });
+
+        $request = Request::create('/foo', 'POST');
+        $response = $app->handle($request);
+        $this->assertContains('<title>Whoops, looks like something went wrong.</title>', $response->getContent());
+        $this->assertEquals(405, $response->getStatusCode());
+        $this->assertEquals('GET', $response->headers->get('Allow'));
+    }
+
+    public function testErrorHandlerMethodNotAllowedDebug()
+    {
+        $app = new Application();
+        $app['debug'] = true;
+
+        $app->get('/foo', function () { return 'foo'; });
+
+        $request = Request::create('/foo', 'POST');
+        $response = $app->handle($request);
+        $this->assertContains('No route found for "POST /foo": Method Not Allowed (Allow: GET)', $response->getContent());
+        $this->assertEquals(405, $response->getStatusCode());
+        $this->assertEquals('GET', $response->headers->get('Allow'));
+    }
+
     public function testNoErrorHandler()
     {
         $app = new Application();
@@ -107,16 +135,21 @@ class ErrorHandlerTest extends \PHPUnit_Framework_TestCase
             throw new NotFoundHttpException('foo exception');
         });
 
+        $app->get('/405', function () { return 'foo'; });
+
         $app->error(function ($e, $code) {
-            return new Response('foo exception handler', $code);
+            return new Response('foo exception handler');
         });
 
         $response = $this->checkRouteResponse($app, '/500', 'foo exception handler');
         $this->assertEquals(500, $response->getStatusCode());
 
-        $request = Request::create('/404');
-        $response = $app->handle($request);
+        $response = $app->handle(Request::create('/404'));
         $this->assertEquals(404, $response->getStatusCode());
+
+        $response = $app->handle(Request::create('/405', 'POST'));
+        $this->assertEquals(405, $response->getStatusCode());
+        $this->assertEquals('GET', $response->headers->get('Allow'));
     }
 
     public function testMultipleErrorHandlers()