fix: Fix the inconsistency in the number of times passed in onRetry

Author: FarmerChillax

retry.go

@@ -154,8 +154,8 @@ func DoWithData[T any](retryableFunc RetryableFuncWithData[T], opts ...Option) (
 
 			lastErr = err
 
-			n++
 			config.onRetry(n, err)
+			n++
 			select {
 			case <-config.timer.After(delay(config, n, err)):
 			case <-config.context.Done():

retry_test.go

@@ -33,6 +33,7 @@ func TestDoWithDataAllFailed(t *testing.T) {
 #9: test
 #10: test`
 	assert.Len(t, err, 10)
+	fmt.Println(err.Error())
 	assert.Equal(t, expectedErrorFormat, err.Error(), "retry error format")
 	assert.Equal(t, uint(45), retrySum, "right count of retry")
 }
@@ -88,16 +89,17 @@ func TestRetryIf(t *testing.T) {
 }
 
 func TestRetryIf_ZeroAttempts(t *testing.T) {
-	var retryCount uint
+	var retryCount, onRetryCount uint
 	err := Do(
 		func() error {
 			if retryCount >= 2 {
 				return errors.New("special")
 			} else {
+				retryCount++
 				return errors.New("test")
 			}
 		},
-		OnRetry(func(n uint, err error) { retryCount++ }),
+		OnRetry(func(n uint, err error) { onRetryCount = n }),
 		RetryIf(func(err error) bool {
 			return err.Error() != "special"
 		}),
@@ -107,7 +109,7 @@ func TestRetryIf_ZeroAttempts(t *testing.T) {
 	assert.Error(t, err)
 
 	assert.Equal(t, "special", err.Error(), "retry error format")
-	assert.Equal(t, uint(2), retryCount, "right count of retry")
+	assert.Equal(t, retryCount, onRetryCount+1, "right count of retry")
 }
 
 func TestZeroAttemptsWithError(t *testing.T) {