Golang exec.InitFakeCmd函数代码示例

func TestFlushChain(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// Success.
			func() ([]byte, error) { return []byte{}, nil },
			// Failure.
			func() ([]byte, error) { return nil, &exec.FakeExitError{1} },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, ProtocolIpv4)
	// Success.
	err := runner.FlushChain(TableNAT, Chain("FOOBAR"))
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if fcmd.CombinedOutputCalls != 1 {
		t.Errorf("expected 1 CombinedOutput() call, got %d", fcmd.CombinedOutputCalls)
	}
	if !util.NewStringSet(fcmd.CombinedOutputLog[0]...).HasAll("iptables", "-t", "nat", "-F", "FOOBAR") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[0])
	}
	// Failure.
	err = runner.FlushChain(TableNAT, Chain("FOOBAR"))
	if err == nil {
		t.Errorf("expected failure")
	}
}

func TestEnsureIPTablesMasqRuleAlreadyExists(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.9.22"), nil },
			// Success.
			func() ([]byte, error) { return []byte{}, nil },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			// iptables version check
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			// The second Command() call is checking the rule.  Success of that exec means "done".
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := iptables.New(&fexec, dbus.NewFake(nil, nil), iptables.ProtocolIpv4)
	defer runner.Destroy()
	err := ensureIPTablesMasqRule(runner, "127.0.0.0/8")
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if fcmd.CombinedOutputCalls != 2 {
		t.Errorf("expected 2 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
	if !sets.NewString(fcmd.CombinedOutputLog[1]...).HasAll("iptables", "-t", "nat", "-C", "POSTROUTING",
		"-m", "comment", "--comment", "kubelet: SNAT outbound cluster traffic",
		"!", "-d", "127.0.0.0/8", "-j", "MASQUERADE") {
		t.Errorf("wrong CombinedOutput() log, got %#v", fcmd.CombinedOutputLog[1])
	}
}

func TestWaitFlagNew(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.4.22"), nil },
			// Success.
			func() ([]byte, error) { return []byte{}, nil },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, dbus.NewFake(nil, nil), ProtocolIpv4)
	defer runner.Destroy()
	err := runner.DeleteChain(TableNAT, Chain("FOOBAR"))
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if fcmd.CombinedOutputCalls != 2 {
		t.Errorf("expected 2 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
	if !sets.NewString(fcmd.CombinedOutputLog[1]...).HasAll("iptables", "-w2") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[1])
	}
	if sets.NewString(fcmd.CombinedOutputLog[1]...).HasAny("-w") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[1])
	}
}

func TestDeleteRuleAlreadyExists(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.9.22"), nil },
			// Status 1 on the first call.
			func() ([]byte, error) { return nil, &exec.FakeExitError{1} },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			// iptables version check
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			// The second Command() call is checking the rule.  Failure of that exec means "does not exist".
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, ProtocolIpv4)
	err := runner.DeleteRule(TableNAT, ChainOutput, "abc", "123")
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if fcmd.CombinedOutputCalls != 2 {
		t.Errorf("expected 2 CombinedOutput() call, got %d", fcmd.CombinedOutputCalls)
	}
	if !util.NewStringSet(fcmd.CombinedOutputLog[1]...).HasAll("iptables", "-t", "nat", "-C", "OUTPUT", "abc", "123") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[0])
	}
}

func TestDeleteRuleNew(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.9.22"), nil },
			// Success on the first call.
			func() ([]byte, error) { return []byte{}, nil },
			// Success on the second call.
			func() ([]byte, error) { return []byte{}, nil },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			// iptables version check
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			// The second Command() call is checking the rule.  Success of that means delete it.
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, ProtocolIpv4)
	err := runner.DeleteRule(TableNAT, ChainOutput, "abc", "123")
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if fcmd.CombinedOutputCalls != 3 {
		t.Errorf("expected 3 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
	if !util.NewStringSet(fcmd.CombinedOutputLog[2]...).HasAll("iptables", "-t", "nat", "-D", "OUTPUT", "abc", "123") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[1])
	}
}

func TestDeleteRuleErrorCreating(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.9.22"), nil },
			// Success on the first call.
			func() ([]byte, error) { return []byte{}, nil },
			// Status 1 on the second call.
			func() ([]byte, error) { return nil, &exec.FakeExitError{1} },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			// iptables version check
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			// The second Command() call is checking the rule.  Success of that means delete it.
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, ProtocolIpv4)
	err := runner.DeleteRule(TableNAT, ChainOutput, "abc", "123")
	if err == nil {
		t.Errorf("expected failure")
	}
	if fcmd.CombinedOutputCalls != 3 {
		t.Errorf("expected 3 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
}

func TestEnsureRuleNew(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.9.22"), nil },
			// Status 1 on the first call.
			func() ([]byte, error) { return nil, &exec.FakeExitError{Status: 1} },
			// Success on the second call.
			func() ([]byte, error) { return []byte{}, nil },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			// iptables version check
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			// The second Command() call is checking the rule.  Failure of that means create it.
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, ProtocolIpv4)
	exists, err := runner.EnsureRule(Append, TableNAT, ChainOutput, "abc", "123")
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if exists {
		t.Errorf("expected exists = false")
	}
	if fcmd.CombinedOutputCalls != 3 {
		t.Errorf("expected 3 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
	if !sets.NewString(fcmd.CombinedOutputLog[2]...).HasAll("iptables", "-t", "nat", "-A", "OUTPUT", "abc", "123") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[2])
	}
}

func TestEnsureRuleAlreadyExists(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.9.22"), nil },
			// Success.
			func() ([]byte, error) { return []byte{}, nil },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			// iptables version check
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			// The second Command() call is checking the rule.  Success of that exec means "done".
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, dbus.NewFake(nil, nil), ProtocolIpv4)
	defer runner.Destroy()
	exists, err := runner.EnsureRule(Append, TableNAT, ChainOutput, "abc", "123")
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if !exists {
		t.Errorf("expected exists = true")
	}
	if fcmd.CombinedOutputCalls != 2 {
		t.Errorf("expected 2 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
	if !sets.NewString(fcmd.CombinedOutputLog[1]...).HasAll("iptables", "-t", "nat", "-C", "OUTPUT", "abc", "123") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[1])
	}
}

func TestEnsureIPTablesMasqRuleErrorChecking(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.9.22"), nil },
			// Status 2 on the first call.
			func() ([]byte, error) { return nil, &exec.FakeExitError{Status: 2} },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			// iptables version check
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			// The second Command() call is checking the rule.  Failure of that means create it.
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := iptables.New(&fexec, dbus.NewFake(nil, nil), iptables.ProtocolIpv4)
	defer runner.Destroy()
	err := ensureIPTablesMasqRule(runner, "127.0.0.0/8")
	if err == nil {
		t.Errorf("expected failure")
	}
	if fcmd.CombinedOutputCalls != 2 {
		t.Errorf("expected 2 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
}

func TestReconcileInterfaceDoesntExist(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			func() ([]byte, error) { return []byte("\n"), nil },
			func() ([]byte, error) { return []byte("\n"), nil },
		},
	}

	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	iface := "cbr0"
	shaper := &tcShaper{e: &fexec, iface: iface}
	err := shaper.ReconcileInterface()
	if err != nil {
		t.Errorf("unexpected error: %v", err)
	}

	if fcmd.CombinedOutputCalls != 2 {
		t.Errorf("unexpected number of calls: %d", fcmd.CombinedOutputCalls)
	}

	for ix, output := range fcmd.CombinedOutputLog {
		if output[0] != "tc" {
			t.Errorf("unexpected command: %s", output[0])
		}
		if output[4] != iface {
			t.Errorf("unexpected interface: %s, expected %s", output[4], iface)
		}
		if ix == 0 {
			if len(output) != 5 {
				t.Errorf("unexpected command: %v", output)
			}
			if output[2] != "show" {
				t.Errorf("unexpected action: %s", output[2])
			}
		}
		if ix == 1 {
			if len(output) != 11 {
				t.Errorf("unexpected command: %v", output)
			}
			if output[2] != "add" {
				t.Errorf("unexpected action: %s", output[2])
			}
			if output[7] != "1:" {
				t.Errorf("unexpected root class: %s", output[7])
			}
			if output[8] != "htb" {
				t.Errorf("unexpected qdisc algo: %s", output[8])
			}
		}
	}
}

func testEnsureChain(t *testing.T, protocol Protocol) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// iptables version check
			func() ([]byte, error) { return []byte("iptables v1.9.22"), nil },
			// Success.
			func() ([]byte, error) { return []byte{}, nil },
			// Exists.
			func() ([]byte, error) { return nil, &exec.FakeExitError{Status: 1} },
			// Failure.
			func() ([]byte, error) { return nil, &exec.FakeExitError{Status: 2} },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, dbus.NewFake(nil, nil), protocol)
	defer runner.Destroy()
	// Success.
	exists, err := runner.EnsureChain(TableNAT, Chain("FOOBAR"))
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if exists {
		t.Errorf("expected exists = false")
	}
	if fcmd.CombinedOutputCalls != 2 {
		t.Errorf("expected 2 CombinedOutput() calls, got %d", fcmd.CombinedOutputCalls)
	}
	cmd := getIPTablesCommand(protocol)
	if !sets.NewString(fcmd.CombinedOutputLog[1]...).HasAll(cmd, "-t", "nat", "-N", "FOOBAR") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[1])
	}
	// Exists.
	exists, err = runner.EnsureChain(TableNAT, Chain("FOOBAR"))
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if !exists {
		t.Errorf("expected exists = true")
	}
	// Failure.
	_, err = runner.EnsureChain(TableNAT, Chain("FOOBAR"))
	if err == nil {
		t.Errorf("expected failure")
	}
}

func testEnsureChain(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// Does not Exists
			func() ([]byte, error) { return nil, &exec.FakeExitError{Status: 1} },
			// Success
			func() ([]byte, error) { return []byte{}, nil },
			// Exists
			func() ([]byte, error) { return nil, nil },
			// Does not Exists
			func() ([]byte, error) { return nil, &exec.FakeExitError{Status: 1} },
			// Fail to create chain
			func() ([]byte, error) { return nil, &exec.FakeExitError{Status: 2} },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}

	runner := New(&fexec)
	exists, err := runner.EnsureChain(TableFilter, "TEST-CHAIN")
	if exists {
		t.Errorf("expected exists = false")
	}
	if err != nil {
		t.Errorf("expected err = nil")
	}

	exists, err = runner.EnsureChain(TableFilter, "TEST-CHAIN")
	if !exists {
		t.Errorf("expected exists = true")
	}
	if err != nil {
		t.Errorf("expected err = nil")
	}

	exists, err = runner.EnsureChain(TableFilter, "TEST-CHAIN")
	if exists {
		t.Errorf("expected exists = false")
	}
	errStr := "Failed to ensure TEST-CHAIN chain: exit 2, output:"
	if err == nil || !strings.Contains(err.Error(), errStr) {
		t.Errorf("expected error: %q", errStr)
	}
}

func TestExecConntrackTool(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			func() ([]byte, error) { return []byte("1 flow entries have been deleted"), nil },
			func() ([]byte, error) { return []byte("1 flow entries have been deleted"), nil },
			func() ([]byte, error) {
				return []byte(""), fmt.Errorf("conntrack v1.4.2 (conntrack-tools): 0 flow entries have been deleted.")
			},
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
		LookPathFunc: func(cmd string) (string, error) { return cmd, nil },
	}

	fakeProxier := Proxier{exec: &fexec}

	testCases := [][]string{
		{"-L", "-p", "udp"},
		{"-D", "-p", "udp", "-d", "10.0.240.1"},
		{"-D", "-p", "udp", "--orig-dst", "10.240.0.2", "--dst-nat", "10.0.10.2"},
	}

	expectErr := []bool{false, false, true}

	for i := range testCases {
		err := fakeProxier.execConntrackTool(testCases[i]...)

		if expectErr[i] {
			if err == nil {
				t.Errorf("expected err, got %v", err)
			}
		} else {
			if err != nil {
				t.Errorf("expected success, got %v", err)
			}
		}

		execCmd := strings.Join(fcmd.CombinedOutputLog[i], " ")
		expectCmd := fmt.Sprintf("%s %s", "conntrack", strings.Join(testCases[i], " "))

		if execCmd != expectCmd {
			t.Errorf("expect execute command: %s, but got: %s", expectCmd, execCmd)
		}
	}
}

func testEnsureChain(t *testing.T, protocol Protocol) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// Success.
			func() ([]byte, error) { return []byte{}, nil },
			// Exists.
			func() ([]byte, error) { return nil, &exec.FakeExitError{1} },
			// Failure.
			func() ([]byte, error) { return nil, &exec.FakeExitError{2} },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	runner := New(&fexec, protocol)
	// Success.
	exists, err := runner.EnsureChain(TableNAT, Chain("FOOBAR"))
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if exists {
		t.Errorf("expected exists = false")
	}
	if fcmd.CombinedOutputCalls != 1 {
		t.Errorf("expected 1 CombinedOutput() call, got %d", fcmd.CombinedOutputCalls)
	}
	cmd := getIptablesCommand(protocol)
	if !util.NewStringSet(fcmd.CombinedOutputLog[0]...).HasAll(cmd, "-t", "nat", "-N", "FOOBAR") {
		t.Errorf("wrong CombinedOutput() log, got %s", fcmd.CombinedOutputLog[0])
	}
	// Exists.
	exists, err = runner.EnsureChain(TableNAT, Chain("FOOBAR"))
	if err != nil {
		t.Errorf("expected success, got %v", err)
	}
	if !exists {
		t.Errorf("expected exists = true")
	}
	// Failure.
	_, err = runner.EnsureChain(TableNAT, Chain("FOOBAR"))
	if err == nil {
		t.Errorf("expected failure")
	}
}

func testEnsureRule(t *testing.T) {
	fcmd := exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// Exists
			func() ([]byte, error) {
				return []byte(`Bridge table: filter

Bridge chain: OUTPUT, entries: 4, policy: ACCEPT
-j TEST
`), nil
			},
			// Does not Exists.
			func() ([]byte, error) {
				return []byte(`Bridge table: filter

Bridge chain: TEST, entries: 0, policy: ACCEPT`), nil
			},
			// Fail to create
			func() ([]byte, error) { return nil, &exec.FakeExitError{Status: 2} },
		},
	}
	fexec := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}

	runner := New(&fexec)

	exists, err := runner.EnsureRule(Append, TableFilter, ChainOutput, "-j", "TEST")
	if !exists {
		t.Errorf("expected exists = true")
	}
	if err != nil {
		t.Errorf("expected err = nil")
	}

	exists, err = runner.EnsureRule(Append, TableFilter, ChainOutput, "-j", "NEXT-TEST")
	if exists {
		t.Errorf("expected exists = false")
	}
	errStr := "Failed to ensure rule: exist 2, output: "
	if err == nil || err.Error() != errStr {
		t.Errorf("expected error: %q", errStr)
	}
}