func TestArgv(t *testing.T) {
    args, err := Argv(" ls   `echo /`   |  wc  -l ", func(backquoted string) (string, error) {
		return backquoted, nil
	}, nil)
	if err != nil {
		t.Fatal(err)
	}
	expects := [][]string{
		[]string{"ls", "echo /"},
		[]string{"wc", "-l"},
	}
	if !reflect.DeepEqual(args, expects) {
		t.Fatal(args)
	}
}