t.Logf("expected %q, got %q", "Hello world", s)
	}
}

func TestDirJoin(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("skipping test on windows")
	}
	wfi, err := os.Stat("/etc/hosts")
	if err != nil {
		t.Skip("skipping test; no /etc/hosts file")
	}
	test := func(d Dir, name string) {
		f, err := d.Open(name)
		if err != nil {