Function TestPrintDefaults

flag_test.go:1311–1357

(t *testing.T)

func (cv *customValue) Type() string { return "custom" }

func TestPrintDefaults(t *testing.T) {
	fs := NewFlagSet("print defaults test", ContinueOnError)
	var buf bytes.Buffer
	fs.SetOutput(&buf)
	fs.Bool("A", false, "for bootstrapping, allow 'any' type")
	fs.Bool("Alongflagname", false, "disable bounds checking")
	fs.BoolP("CCC", "C", true, "a boolean defaulting to true")
	fs.String("D", "", "set relative `path` for local imports")
	fs.Float64("F", 2.7, "a non-zero `number`")
	fs.Float64("G", 0, "a float that defaults to zero")
	fs.Int("N", 27, "a non-zero int")
	fs.IntSlice("Ints", []int{}, "int slice with zero default")
	fs.IP("IP", nil, "IP address with no default")
	fs.IPMask("IPMask", nil, "Netmask address with no default")
	fs.IPNet("IPNet", net.IPNet{}, "IP network with no default")
	fs.Int("Z", 0, "an int that defaults to zero")
	fs.Duration("maxT", 0, "set `timeout` for dial")
	fs.String("ND1", "foo", "a string with NoOptDefVal")
	fs.Lookup("ND1").NoOptDefVal = "bar"
	fs.Int("ND2", 1234, "a `num` with NoOptDefVal")
	fs.Lookup("ND2").NoOptDefVal = "4321"
	fs.IntP("EEE", "E", 4321, "a `num` with NoOptDefVal")
	fs.ShorthandLookup("E").NoOptDefVal = "1234"
	fs.StringSlice("StringSlice", []string{}, "string slice with zero default")
	fs.StringArray("StringArray", []string{}, "string array with zero default")
	fs.CountP("verbose", "v", "verbosity")

	var cv customValue
	fs.Var(&cv, "custom", "custom Value implementation")

	cv2 := customValue(10)
	fs.VarP(&cv2, "customP", "", "a VarP with default")

	// Simulate case where a value has been provided and the help screen is shown
	var cv3 customValue
	fs.Var(&cv3, "custom-with-val", "custom value which has been set from command line while help is shown")
	err := fs.Parse([]string{"--custom-with-val", "3"})
	if err != nil {
		t.Error("Parsing flags failed:", err)
	}

	fs.PrintDefaults()
	got := buf.String()
	if got != defaultOutput {
		t.Errorf("\n--- Got:\n%s--- Wanted:\n%s\n", got, defaultOutput)
	}
}

func TestVisitAllFlagOrder(t *testing.T) {
	fs := NewFlagSet("TestVisitAllFlagOrder", ContinueOnError)