fcmd := fakeexec.FakeCmd{
		CombinedOutputScript: []fakeexec.FakeAction{
			// iptables version check
			func() ([]byte, []byte, error) { return []byte(iptablesCmd + version), nil, nil },
		},
		RunScript: []fakeexec.FakeAction{
			func() ([]byte, []byte, error) { return []byte(output), []byte(stderrOutput), nil },
			func() ([]byte, []byte, error) { return nil, []byte(stderrOutput), &fakeexec.FakeExitError{Status: 1} },
		},