rename and moved to HttpStatusCoder below

Author: suwakei

httperror.go

@@ -14,6 +14,16 @@ type HTTPStatusCoder interface {
 	StatusCode() int
 }
 
+// StatusCode returns status code from error if it implements HTTPStatusCoder interface.
+// If error does not implement the interface it returns 0.
+func StatusCode(err error) int {
+	var sc HTTPStatusCoder
+	if errors.As(err, &sc) {
+		return sc.StatusCode()
+	}
+	return 0
+}
+
 // Following errors can produce HTTP status code by implementing HTTPStatusCoder interface
 var (
 	ErrBadRequest                  = &httpError{http.StatusBadRequest}            // 400
@@ -73,16 +83,6 @@ func (he *HTTPError) Error() string {
 	return fmt.Sprintf("code=%d, message=%v, err=%v", he.Code, msg, he.err.Error())
 }
 
-// HTTPStatusCode returns status code from error if it implements HTTPStatusCoder interface.
-// If error does not implement the interface it returns 0.
-func HTTPStatusCode(err error) int {
-	var sc HTTPStatusCoder
-	if errors.As(err, &sc) {
-		return sc.StatusCode()
-	}
-	return 0
-}
-
 // Wrap eturns new HTTPError with given errors wrapped inside
 func (he HTTPError) Wrap(err error) error {
 	return &HTTPError{

httperror_test.go

@@ -68,7 +68,7 @@ func TestNewHTTPError(t *testing.T) {
 	assert.Equal(t, err2, err)
 }
 
-func TestHTTPStatusCode(t *testing.T) {
+func TestStatusCode(t *testing.T) {
 	var testCases = []struct {
 		name   string
 		err    error
@@ -103,7 +103,7 @@ func TestHTTPStatusCode(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			assert.Equal(t, tc.expect, HTTPStatusCode(tc.err))
+			assert.Equal(t, tc.expect, StatusCode(tc.err))
 		})
 	}
 }