feat(errors): add support for HTTP 422 errors (#26)

Author: Joshua-Anderson

errors.go

@@ -76,6 +76,8 @@ var (
 	ErrTagNotFound = errors.New(invalidTagMsg)
 	// ErrDuplicateApp is returned when create an app with an ID that already exists
 	ErrDuplicateApp = errors.New(duplicateIDMsg)
+	// ErrUnprocessable is returned when the controller throws a 422.
+	ErrUnprocessable = errors.New("Unable to process your request.")
 )
 
 func checkForErrors(res *http.Response) error {
@@ -175,6 +177,8 @@ func checkForErrors(res *http.Response) error {
 		return ErrMethodNotAllowed
 	case 409:
 		return ErrConflict
+	case 422:
+		return ErrUnprocessable
 	case 500:
 		return ErrServerError
 	default:

errors_test.go

@@ -243,6 +243,13 @@ func TestErrors(t *testing.T) {
 			},
 			expected: ErrConflict,
 		},
+		errorTest{
+			res: &http.Response{
+				StatusCode: 422,
+				Body:       readCloser(""),
+			},
+			expected: ErrUnprocessable,
+		},
 		errorTest{
 			res: &http.Response{
 				StatusCode: 500,