[short] skip

go test -trimpath -v .
! stdout '[/\\]pkg_test_test[/\\]'
stdout -count=2 '[/\\]pkg_test[/\\]'

-- go.mod --
module example.com/pkg_test

go 1.17

-- pkg.go --
package pkg_test

import "runtime"

func PrintFile() {
	_, file, _, _ := runtime.Caller(0)
	println(file)
}

-- pkg_x_test.go --
package pkg_test_test

import (
	"runtime"
	"testing"

	"example.com/pkg_test"
)

func PrintFileForTest() {
	_, file, _, _ := runtime.Caller(0)
	println(file)
}

func TestMain(m *testing.M) {
	pkg_test.PrintFile()
	PrintFileForTest()
}