refactor: rename package 'utils' to 'internal'

internal/utils.go

@@ -0,0 +1,16 @@
+// Copyright 2021 dudaodong@gmail.com. All rights reserved.
+// Use of this source code is governed by MIT license
+
+// Package internal is for internal use.
+package internal
+
+import (
+	"fmt"
+	"testing"
+)
+
+// LogFailedTestInfo log test failed info for internal use
+func LogFailedTestInfo(t *testing.T, testCase, input, expected, result interface{}) {
+	errInfo := fmt.Sprintf("Test case %v:  input is %+v, expected %v, but result is %v", testCase, input, expected, result)
+	t.Error(errInfo)
+}