在Go中，如何在运行时获取测试环境？

I want to check if codes are running for the go test,so that I could make some configurations.

Is there any function to do that? Like:

runtime.IsBeingTested()

Just specify that you run a test in test's init. For example, in pkg.go:

package pkg

var isTesting = false

// ...

And in pkg_test.go:

package pkg

func init() {
    isTesting = true
}

// ...

This technique can be used not just with bools but with any data or function. If you have some variable in your package (in your case, a configuration variable), you can just override it in init.