public static final Solaris SOLARIS = new Solaris();
    public static final Linux LINUX = new Linux();
    public static final FreeBSD FREE_BSD = new FreeBSD();
    public static final Unix UNIX = new Unix();
    private static OperatingSystem currentOs;
    private final String toStringValue;
    private final String osName;
    private final String osVersion;

    OperatingSystem() {

	if !testableNetwork("unix") {
		t.Skip("unix test")
	}

	handler := func(ls *localServer, ln Listener) {}
	for _, laddr := range []string{"", testUnixAddr(t)} {
		laddr := laddr
		taddr := testUnixAddr(t)
		ta, err := ResolveUnixAddr("unix", taddr)
		if err != nil {
			t.Fatal(err)
		}
		ln, err := ListenUnix("unix", ta)
		if err != nil {
			t.Fatal(err)
		}

			}
		})
	}
}

func phaseBuilder1(name string, runIf func(data RunData) (bool, error), phases ...Phase) Phase {
	return Phase{
		Name:   name,
		Short:  fmt.Sprintf("long description for %s ...", name),
		Phases: phases,
		Run:    runBuilder(name),
		RunIf:  runIf,
	}
}

var callstack []string

func runBuilder(name string) func(data RunData) error {

		StartTime: metav1.NewTime(time.Unix(0, container.CreatedAt)),
		CPU:       &statsapi.CPUStats{},
		Memory:    &statsapi.MemoryStats{},
		Rootfs:    &statsapi.FsStats{},
		// UserDefinedMetrics is not supported by CRI.
	}
	if stats.Cpu != nil {
		result.CPU.Time = metav1.NewTime(time.Unix(0, stats.Cpu.Timestamp))
		if stats.Cpu.UsageCoreNanoSeconds != nil {

			fis:            getNFInfo(16, 16, 1603863445, "36a21454-a2ca-11eb-bbaa-93a81c686f21", nil, nil),
			modTime:        time.Unix(1603863445, 0),
			expectedErr:    nil,
			expectedQuorum: 8,
		},
		{
			fis:            getNFInfo(16, 7, 1603863445, "36a21454-a2ca-11eb-bbaa-93a81c686f21", nil, nil),
			modTime:        time.Unix(1603863445, 0),
			expectedErr:    InsufficientReadQuorum{},
			expectedQuorum: 8,
		},
		{

					Items: []metav1beta1.PartialObjectMetadata{
						{ObjectMeta: metav1.ObjectMeta{Name: "blah", CreationTimestamp: metav1.NewTime(time.Unix(1, 0))}},
						{ObjectMeta: metav1.ObjectMeta{Name: "blah-2", CreationTimestamp: metav1.NewTime(time.Unix(2, 0))}},
					},
				},
				tableOptions: nil,
			},
			want: &metav1.Table{

			},
			expected: &kubecontainer.Status{
				ID:         *cid,
				Image:      imageSpec.Image,
				State:      kubecontainer.ContainerStateExited,
				CreatedAt:  time.Unix(0, createdAt),
				StartedAt:  time.Unix(0, startedAt),
				FinishedAt: time.Unix(0, finishedAt),
				ExitCode:   121,
				Reason:     "GotKilled",
				Message:    "The container was killed",
			},
		},
		"unknown container": {

	if err != nil {
		return nil, fmt.Errorf("failed to resolve unix addr: %w", err)
	}
	// remove potentially existing address
	// Remove unix socket before use, if one is leftover from previous CNI restart
	if err := os.Remove(addr); err != nil && !os.IsNotExist(err) {
		// Anything other than "file not found" is an error.
		return nil, fmt.Errorf("failed to remove unix://%s: %w", addr, err)
	}

			Name:  "noop microsecond precision",
			Old:   metav1.NewMicroTime(time.Unix(100, int64(5*time.Microsecond))),
			New:   metav1.NewMicroTime(time.Unix(100, int64(5*time.Microsecond))),
			Valid: true,
		},
		{
			Name:  "noop nanosecond precision",
			Old:   metav1.NewMicroTime(time.Unix(100, int64(5*time.Nanosecond))),
			New:   metav1.NewMicroTime(time.Unix(100, int64(5*time.Nanosecond))),
			Valid: true,
		},
		{

	}
	t.Parallel()

	for _, network := range []string{"tcp", "unix", "unixpacket"} {
		network := network
		t.Run(network, func(t *testing.T) {
			if !testableNetwork(network) {
				t.Skipf("network %s is not testable on the current platform", network)
			}
			t.Parallel()

			ln := newLocalListener(t, network)
			switch network {
			case "unix", "unixpacket":
				defer os.Remove(ln.Addr().String())
			}