test(handlers): passing more arguments to handler

README.md

@@ -14,7 +14,14 @@ and don't require developer to worry about some things.
 First, we create a basic Gorrila/Mux API.
 
 ```go
-func HomeHandler(request geh.Request, response geh.Response) {
+func HomeHandler(
+	request geh.Request, 
+	response geh.Response,
+	arguments ...interface{},
+) {
+	printSomething := arguments[0].(func (string))
+	printSomething("print something")
+
 	geh.Status(http.StatusOk).
 		Json(map[string]interface{}{
             "hello": "I",
@@ -23,8 +30,12 @@ func HomeHandler(request geh.Request, response geh.Response) {
 }
 
 func main() {
+	func printSomething(something string) {
+		print(something)
+	}
+
     r := mux.NewRouter()
-    r.HandleFunc("/", geh.Handler(HomeHandler))
+    r.HandleFunc("/", geh.Handler(HomeHandler, printSomething))
 }
 ```
 

handler.go

@@ -17,7 +17,7 @@ func Handler(handler EasyHandler, arguments ...interface{}) MuxHandler {
 		request := NewRequest(httpRequest)
 		response := NewResponse(responseWriter)
 
-		receivedResponse := handler(request, response, arguments)
+		receivedResponse := handler(request, response, arguments...)
 		for key, value := range receivedResponse.GetHeaders() {
 			responseWriter.Header().Set(key, value)
 		}

handler_test.go

@@ -29,3 +29,28 @@ func TestHandler(t *testing.T) {
 	assert.Equal(t, "application/json", responseWriter.Header().Get("Content-Type"))
 	assert.Equal(t, 200, responseWriter.Code)
 }
+
+func TestHandlerPassingArguments(t *testing.T) {
+	handler := Handler(
+		func(
+			request Request, response Response, arguments ...interface{},
+		) *Response {
+			returnsSameString := arguments[0].(func(string) string)
+
+			return response.Json(
+				map[string]string{
+					"hello": returnsSameString("world"),
+				},
+			)
+		},
+		func(something string) string { return something },
+	)
+
+	httpRequest, _ := http.NewRequest("GET", "/resource", nil)
+	responseWriter := httptest.NewRecorder()
+	handler(responseWriter, httpRequest)
+
+	assert.Equal(t, "{\"hello\":\"world\"}", responseWriter.Body.String())
+	assert.Equal(t, "application/json", responseWriter.Header().Get("Content-Type"))
+	assert.Equal(t, 200, responseWriter.Code)
+}