英文:
How to get the test package to indicate the caller where the test failed?
问题
我正在测试中使用一个函数来包装错误，代码如下：
在checks.go中：
func NoError(t *testing.T, err error, message ...string) {
if err != nil {
t.Error(message)
}
}
在我的测试文件中，比如my_test.go，我有类似这样的代码：
func TestThis(t *testing.T){
err := someFuncWithError(...)
NoError(t, err, "error found")
}
当发生错误时，t.Error()指示错误发生在checks.go而不是my_test.go中的行。我可以理解为什么会这样。**我该如何使NoError(...)打印出在my_test.go中引发错误的行？**也就是说，如果我在my_test.go中调用t.Error()时的行为方式。
也就是说，我得到的是：
checks.go:33: some test failed
我想要的是：
my_test.go:12: test failed here
我尝试过的方法：
调用runtime：
_, f, l, _ := runtime.Caller(1)
t.Errorf("%s:%d %s, in %s", f, l, "some error", t.Name())
但这仍然导致t.Error()打印出类似"checks.go:12"的内容。增加runtime.Caller()中的skip参数也没有帮助。
我还查看了如何在测试套件中设置深度，但我找不到方法来实现。
英文:
I am wrapping testing.Error in a func like so:
In checks.go
func NoError(t *testing.T, err error, message ...string) {
if err != nil {
t.Error(message)
}
}
In my test file, say, my_test.go, I have something like this:
func TestThis(t *testing.T){
err := someFuncWithError(...)
NoError(t, err, "error found")
}
When an error happens, t.Error() indicates that the error happened in checks.go and not the line in my_test.go. I can see why that happens. How do I make it so that NoError(...) prints the line which threw the error in the my_test.go? I.e. The way it behaves if I were to call t.Error() in my_test.go.
IOW, I get:
checks.go:33: some test failed
What I want:
my_test.go:12: test failed here
Things I tried:
calling runtime:
_, f, l, _ := runtime.Caller(1)
t.Errorf("%s:%d %s, in %s", f, l, "some error", t.Name())
But that still resulted in t.Error() printing something like "checks.go:12". Increasing the skip param in runtime.Caller() didn't help.
I also looked at how to set the depth in the testing suite, but I couldn't find a way to do it.
答案1
得分: 2
使用t.Helper()函数来表示你的辅助函数是一个辅助函数。
根据Godoc的说明：
func (c *T) Helper()Helper将调用的函数标记为测试辅助函数。在打印文件和行信息时，该函数将被跳过。Helper可以同时从多个goroutine中调用。
示例：
func NoError(t *testing.T, err error, message ...string) {
t.Helper()
if err != nil {
t.Error(message)
}
}
英文:
Use the t.Helper() function to indicate that your helper function is, well, a helper function.
From the Godoc:
> func (c *T) Helper()
>
> Helper marks the calling function as a test helper function. When printing file and line information, that function will be skipped. Helper may be called simultaneously from multiple goroutines.
Example:
func NoError(t *testing.T, err error, message ...string) {
t.Helper()
if err != nil {
t.Error(message)
}
}
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