[short] skip

go test xtestonly
! stdout '^ok.*\[no tests to run\]'
stdout '^ok'

-- xtestonly/f.go --
package xtestonly

func F() int { return 42 }
-- xtestonly/f_test.go --
package xtestonly_test

import (
	"testing"
	"xtestonly"
)

func TestF(t *testing.T) {
	if x := xtestonly.F(); x != 42 {
		t.Errorf("f.F() = %d, want 42", x)
	}
}