[hooks] provide helpful message for incorrect op

* provide helpful message for incorrect op case
* fix breaking test

Author: pavanka

webhooks/hooks.go

@@ -115,6 +115,10 @@ func (h *Hooks) appendHookOperation(
 
 	method := strings.ToUpper(hookOp.Method)
 	if method != "POST" && method != "PUT" && method != "DELETE" {
+		op, err := json.MarshalIndent(hookOp, "", " ")
+		if err == nil {
+			fmt.Fprintf(e.Out, "Please fix the incorrect operation in:\n%s\n", op)
+		}
 		return false, nil, stackerr.Wrap(errInvalidFormat)
 	}
 

webhooks/triggers_test.go

@@ -49,7 +49,7 @@ func newTriggersHarness(t testing.TB) *parsecli.Harness {
 				}
 			} else {
 				return &http.Response{StatusCode: http.StatusBadRequest},
-					errors.New("no such trigger is defined")
+					errors.New("no such trigger is defined for class")
 			}
 		case "POST":
 			ensure.DeepEqual(t, r.URL.Path, defaultTriggersURL)