go test: only run tests that contain a build tag?

Question

I have a set of long running tests, defined with the build tag. For example,

// file some_test.go
//+build func_test

(rest of file with test cases)

And I have many other shorter running tests, without this build flag. Is there a way I can easily run only the tests containing the build tag "func_test"?

Note that if I just run go test -tags func_test, it runs ALL tests including the ones in some_test.go.

Answer 1

As per the golang Doc https://golang.org/pkg/go/build/

The build tag lists the conditions under which a file should be included in the package. So if you want to run the test only for the build tags func_test then you need to provide a different tag for the other tests.

Here is an example: I have following 2 test files in my test directory.

func_test.go

//+build test_all func_test

package go_build_test

import (
    "fmt"
    "testing"
)

func TestNormal(t *testing.T) {
    fmt.Println("testing:", t.Name())

}

other_test.go

//+build test_all,!func_test

package go_build_test

import "testing"
import "fmt"

func TestOtherCase(t *testing.T) {
    fmt.Println("testing:", t.Name())
}

Now If you want to run all the tests.

$ go test -tags=test_all
testing: TestNormal
testing: TestOtherCase
PASS
ok      _/D_/Project/ARC/source/prototype/go/src/go-build-test  0.186s

Only running the func_test

$ go test -tags=func_test
testing: TestNormal
PASS
ok      _/D_/Project/ARC/source/prototype/go/src/go-build-test  1.395s

The trick is to work with the //+build comment with AND/OR conditions.

Answer 2

You could name your test by convention. I.e let your long running test function start with TestLong_ Then run them with go test ./... -run TestLong -tags func_test