}

// unsetenv removes an environment variable.
func (tg *testgoData) unsetenv(name string) {
	if tg.env == nil {
		tg.env = append([]string(nil), os.Environ()...)
		tg.env = append(tg.env, "GO111MODULE=off", "TESTGONETWORK=panic")
		if testing.Short() {
			tg.env = append(tg.env, "TESTGOVCS=panic")
		}
	}
	for i, v := range tg.env {
		if strings.HasPrefix(v, name+"=") {
			tg.env = append(tg.env[:i], tg.env[i+1:]...)