log.Panic(err)
	}
	os.Setenv("PWD", modRoot)
	if err := os.WriteFile("go.mod", []byte("module cgolife\n"), 0666); err != nil {
		log.Panic(err)
	}

	return m.Run()
}

// TestTestRun runs a test case for cgo //export.
func TestTestRun(t *testing.T) {
	testenv.MustHaveGoRun(t)
	testenv.MustHaveCGO(t)

	cmd := exec.Command("go", "run", "main.go")
	got, err := cmd.CombinedOutput()
	if err != nil {

	}
	os.Setenv("PWD", modRoot)
	if err := os.WriteFile("go.mod", []byte("module cgostdio\n"), 0666); err != nil {
		log.Panic(err)
	}

	return m.Run()
}

// TestTestRun runs a cgo test that doesn't depend on non-standard libraries.
func TestTestRun(t *testing.T) {
	testenv.MustHaveGoRun(t)
	testenv.MustHaveCGO(t)

	for _, file := range [...]string{
		"chain.go",
		"fib.go",
		"hello.go",
	} {
		file := file