rootCmd := GetRootCmd([]string{"--unknown-flag"})
	fErr := rootCmd.Execute()

	switch fErr.(type) {
	case istioctlutil.CommandParseError:
		// do nothing
	default:
		t.Errorf("Expected a CommandParseError, but got %q.", fErr)
	}

	// we should propagate to subcommands
	rootCmd = GetRootCmd([]string{"analyze", "--unknown-flag"})
	fErr = rootCmd.Execute()

	switch fErr.(type) {
	case istioctlutil.CommandParseError:

	_ = parent.PersistentFlags().String(childFlag2, "", childFlag2)
	parent.AddCommand(child)

	// verify both parent flags and the child flag are visible by default
	parent.SetArgs([]string{"child", "--help"})
	if err := parent.Execute(); err != nil {
		t.Fatal(err)
	}
	got := out.String()
	out.Reset()
	checkHelpForFlag(t, got, parentFlag0, true)
	checkHelpForFlag(t, got, parentFlag1, true)
	checkHelpForFlag(t, got, parentFlag2, true)

func VerifyOutput(t *testing.T, cmd *cobra.Command, c TestCase) {
	t.Helper()

	cmd.SetArgs(c.Args)

	var out bytes.Buffer
	cmd.SetOut(&out)
	cmd.SetErr(&out)
	cmd.SilenceUsage = true

	fErr := cmd.Execute()
	output := out.String()

	if c.ExpectedOutput != "" && c.ExpectedOutput != output {
		t.Fatalf("Unexpected output for '%s %s'\n got: %q\nwant: %q", cmd.Name(),
			strings.Join(c.Args, " "), output, c.ExpectedOutput)
	}

		fmt.Fprintf(os.Stderr, "Could not initialize: %v\n", err)
		exitCode := cmd.GetExitCode(err)
		os.Exit(exitCode)
	}

	rootCmd := cmd.GetRootCmd(os.Args[1:])

	log.EnableKlogWithCobra()

	if err := rootCmd.Execute(); err != nil {
		exitCode := cmd.GetExitCode(err)
		os.Exit(exitCode)
	}

	err := externalCommand.Run()

	if err != nil || len(stderr.Bytes()) != 0 {
		return stderr.String(), err
	}

	return strings.TrimSuffix(stdout.String(), "\n"), err
}

func Execute(cmd string, args ...string) error {
	log.Debugf("Running command: %s %s", cmd, strings.Join(args, " "))
	externalCommand := exec.Command(cmd, args...)
	stdout := &bytes.Buffer{}
	stderr := &bytes.Buffer{}

				t.Fatal("expected output is empty")
			}

			var out bytes.Buffer
			rootCmd := Cmd(ctx)
			rootCmd.SetArgs(tt.args)
			rootCmd.SetOut(&out)
			rootCmd.SetErr(&out)

			fErr := rootCmd.Execute()
			if fErr != nil {
				t.Fatal(fErr)
			}
			output := out.String()
			if output != expectedOut {
				t.Fatalf("expected %s, got %s", expectedOut, output)
			}
		})
	}
}

	t.Helper()

	var out bytes.Buffer
	cmd.SetArgs(c.args)
	cmd.SilenceUsage = true
	cmd.SetOut(&out)
	cmd.SetErr(&out)

	fErr := cmd.Execute()
	output := out.String()

	if c.expectedOutput != "" && c.expectedOutput != output {
		t.Fatalf("Unexpected output for 'istioctl %s'\n got: %q\nwant: %q", strings.Join(c.args, " "), output, c.expectedOutput)
	}

  tid="$(<<<"${TRACEPARENT:-}" cut -d- -f2)"
  tid="${tid:-"$(tr -dc 'a-f0-9' < /dev/urandom | head -c 32)"}"
  # Always generate a new span ID
  local sid
  sid="$(tr -dc 'a-f0-9' < /dev/urandom | head -c 16)"

  # Execute the command they wanted with the propagation through TRACEPARENT
  if [[ $was_execution_trace == 1 ]]; then
    { set -x; } 2>/dev/null
  fi

  TRACEPARENT="00-${tid}-${sid}-01" "${@:2}"
  local result="$?"

			}

			kubeClientFunc = func() (kube.CLIClient, error) {
				return nil, nil
			}
			rootCmd := GetRootCmd(cli.NewFakeContext(&cli.NewFakeContextOption{
				Version: "25",
			}), args)
			err := rootCmd.Execute()
			assert.NoError(t, err)

			readActions := map[string]bool{
				"get":   true,
				"list":  true,
				"watch": true,
			}

			actions := extendedClient.Kube().(*fake.Clientset).Actions()

	t.Helper()

	var out bytes.Buffer
	cmd.SetArgs(c.args)
	cmd.SilenceUsage = true
	cmd.SetOut(&out)
	cmd.SetErr(&out)

	fErr := cmd.Execute()
	output := out.String()

	if c.expectedOutput != "" && c.expectedOutput != output {
		t.Fatalf("Unexpected output for 'istioctl %s'\n got: %q\nwant: %q", strings.Join(c.args, " "), output, c.expectedOutput)
	}