Fix route_add{,_test}.go to use an io.Writer for saving the response

Also add a TODO regarding untested response payload.

Co-authored-by: Héctor Hurtado <hector.hurtado@bbva.com>

internal/client/route_add.go

@@ -3,16 +3,18 @@ package client
 import (
 	"bytes"
 	"encoding/json"
+	"io"
+
 	"github.com/BBVA/kapow/internal/http"
 )
 
 // AddRoute will add a new route in kapow
-func AddRoute(host, path, method, entrypoint, command string) error {
+func AddRoute(host, path, method, entrypoint, command string, w io.Writer) error {
 	url := host + "/routes"
 	body, _ := json.Marshal(map[string]string{
 		"method":      method,
 		"url_pattern": path,
 		"entrypoint":  entrypoint,
 		"command":     command})
-	return http.Put(url, "application/json", bytes.NewReader(body), nil)
+	return http.Put(url, "application/json", bytes.NewReader(body), w)
 }