Get the name of the currently executing testing test?

Question

In Go, how would I get the name of the currently executing test, the function name starting with Test, of the current test without passing it in manually?

Answer 1

Just use the Name() method:

func TestSomethingReallyCool(t *testing.T) {
    t.Logf("Test name is %s", t.Name())
}

Here's the docs and here's the code.

Answer 2

This is an interesting question. When you define a test, you pass around a struct that represents the test itself:

func TestSomething(t *testing.T) {

testing.T is defined as follows:

type T struct {
    common
    name          string    // Name of test.
    startParallel chan bool // Parallel tests will wait on this.
}

So the struct t has the name of the test in a field called name. However, for some reason, the name is not exported and there is no public accessor that will return it. Therefore, you can't access it directly.

There is a workaround. You can use the reflect package to access the unexported name and get the test name from t:

v := reflect.ValueOf(*t)
name := v.FieldByName("name")

// name == "TestSomething"

I'm not sure if this is the best approach, but I was not able to find another reasonable solution to access name from the testing package.

Answer 3

The above answer is great. However, it does require an implementation on your part. In case you just need the name of the method do the following:

Lets say that t is defined as: t *testing.T and you are running from a function called: TestNetworkProbe Then calling:

t.Log("Pass",t)

Will produce (Scroll a little to the right and you shell find...)

Pass &{{{{0 0} 0 0 0 0} [] false false false {63642628359 332863663 0x9bdec0} 0 0xc82008e090 0xc82006a300} TestNetworkProbe false 0xc82006a240}