Related to #1962. Implementation with UnitTest

Slim/Route.php

@@ -12,6 +12,7 @@
 use InvalidArgumentException;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Message\ResponseInterface;
+use Slim\Exception\SlimException;
 use Slim\Handlers\Strategies\RequestResponse;
 use Slim\Interfaces\InvocationStrategyInterface;
 use Slim\Interfaces\RouteInterface;
@@ -69,6 +70,13 @@ class Route extends Routable implements RouteInterface
      */
     protected $arguments = [];
 
+    /**
+     * The callable payload
+     *
+     * @var callable
+     */
+    protected $callable;
+
     /**
      * Create new route
      *
@@ -120,6 +128,16 @@ public function getCallable()
         return $this->callable;
     }
 
+    /**
+     * This method enables you to override the Route's callable
+     *
+     * @param string|\Closure $callable
+     */
+    public function setCallable($callable)
+    {
+        $this->callable = $callable;
+    }
+
     /**
      * Get route methods
      *

tests/RouteTest.php

@@ -427,4 +427,30 @@ public function testPatternCanBeChanged()
         $route->setPattern('/hola/{nombre}');
         $this->assertEquals('/hola/{nombre}', $route->getPattern());
     }
+
+    /**
+     * Ensure that the callable can be changed
+     */
+    public function testChangingCallable()
+    {
+        $container = new Container();
+        $container['CallableTest2'] = new CallableTest;
+        $container['foundHandler'] = function () {
+            return new InvocationStrategyTest();
+        };
+
+        $route = new Route(['GET'], '/', 'CallableTest:toCall'); //Note that this doesn't actually exist
+        $route->setContainer($container);
+
+        $route->setCallable('CallableTest2:toCall'); //Then we fix it here.
+
+        $uri = Uri::createFromString('https://example.com:80');
+        $body = new Body(fopen('php://temp', 'r+'));
+        $request = new Request('GET', $uri, new Headers(), [], Environment::mock()->all(), $body);
+
+        $result = $route->callMiddlewareStack($request, new Response);
+
+        $this->assertInstanceOf('Slim\Http\Response', $result);
+        $this->assertEquals([$container['CallableTest2'], 'toCall'], InvocationStrategyTest::$LastCalledFor);
+    }
 }