1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
17 test_bool = Bool("test_bool", false, "bool value")
18 test_int = Int("test_int", 0, "int value")
19 test_int64 = Int64("test_int64", 0, "int64 value")
20 test_uint = Uint("test_uint", 0, "uint value")
21 test_uint64 = Uint64("test_uint64", 0, "uint64 value")
22 test_string = String("test_string", "0", "string value")
23 test_float64 = Float64("test_float64", 0, "float64 value")
24 test_duration = Duration("test_duration", 0, "time.Duration value")
27 func boolString(s string) string {
34 func TestEverything(t *testing.T) {
35 m := make(map[string]*Flag)
37 visitor := func(f *Flag) {
38 if len(f.Name) > 5 && f.Name[0:5] == "test_" {
42 case f.Value.String() == desired:
44 case f.Name == "test_bool" && f.Value.String() == boolString(desired):
46 case f.Name == "test_duration" && f.Value.String() == desired+"s":
50 t.Error("Visit: bad value", f.Value.String(), "for", f.Name)
56 t.Error("VisitAll misses some flags")
61 m = make(map[string]*Flag)
64 t.Errorf("Visit sees unset flags")
70 Set("test_bool", "true")
72 Set("test_int64", "1")
74 Set("test_uint64", "1")
75 Set("test_string", "1")
76 Set("test_float64", "1")
77 Set("test_duration", "1s")
81 t.Error("Visit fails after set")
86 // Now test they're visited in sort order.
87 var flagNames []string
88 Visit(func(f *Flag) { flagNames = append(flagNames, f.Name) })
89 if !sort.StringsAreSorted(flagNames) {
90 t.Errorf("flag names not sorted: %v", flagNames)
94 func TestUsage(t *testing.T) {
96 ResetForTesting(func() { called = true })
97 if CommandLine().Parse([]string{"-x"}) == nil {
98 t.Error("parse did not fail for unknown flag")
101 t.Error("did not call Usage for unknown flag")
105 func testParse(f *FlagSet, t *testing.T) {
107 t.Error("f.Parse() = true before Parse")
109 boolFlag := f.Bool("bool", false, "bool value")
110 bool2Flag := f.Bool("bool2", false, "bool2 value")
111 intFlag := f.Int("int", 0, "int value")
112 int64Flag := f.Int64("int64", 0, "int64 value")
113 uintFlag := f.Uint("uint", 0, "uint value")
114 uint64Flag := f.Uint64("uint64", 0, "uint64 value")
115 stringFlag := f.String("string", "0", "string value")
116 float64Flag := f.Float64("float64", 0, "float64 value")
117 durationFlag := f.Duration("duration", 5*time.Second, "time.Duration value")
118 extra := "one-extra-argument"
127 "-float64", "2718e28",
131 if err := f.Parse(args); err != nil {
135 t.Error("f.Parse() = false after Parse")
137 if *boolFlag != true {
138 t.Error("bool flag should be true, is ", *boolFlag)
140 if *bool2Flag != true {
141 t.Error("bool2 flag should be true, is ", *bool2Flag)
144 t.Error("int flag should be 22, is ", *intFlag)
146 if *int64Flag != 0x23 {
147 t.Error("int64 flag should be 0x23, is ", *int64Flag)
150 t.Error("uint flag should be 24, is ", *uintFlag)
152 if *uint64Flag != 25 {
153 t.Error("uint64 flag should be 25, is ", *uint64Flag)
155 if *stringFlag != "hello" {
156 t.Error("string flag should be `hello`, is ", *stringFlag)
158 if *float64Flag != 2718e28 {
159 t.Error("float64 flag should be 2718e28, is ", *float64Flag)
161 if *durationFlag != 2*time.Minute {
162 t.Error("duration flag should be 2m, is ", *durationFlag)
164 if len(f.Args()) != 1 {
165 t.Error("expected one argument, got", len(f.Args()))
166 } else if f.Args()[0] != extra {
167 t.Errorf("expected argument %q got %q", extra, f.Args()[0])
171 func TestParse(t *testing.T) {
172 ResetForTesting(func() { t.Error("bad parse") })
173 testParse(CommandLine(), t)
176 func TestFlagSetParse(t *testing.T) {
177 testParse(NewFlagSet("test", ContinueOnError), t)
180 // Declare a user-defined flag type.
181 type flagVar []string
183 func (f *flagVar) String() string {
184 return fmt.Sprint([]string(*f))
187 func (f *flagVar) Set(value string) error {
188 *f = append(*f, value)
192 func TestUserDefined(t *testing.T) {
194 flags.Init("test", ContinueOnError)
196 flags.Var(&v, "v", "usage")
197 if err := flags.Parse([]string{"-v", "1", "-v", "2", "-v=3"}); err != nil {
201 t.Fatal("expected 3 args; got ", len(v))
204 if v.String() != expect {
205 t.Errorf("expected value %q got %q", expect, v.String())
209 // This tests that one can reset the flags. This still works but not well, and is
210 // superseded by FlagSet.
211 func TestChangingArgs(t *testing.T) {
212 ResetForTesting(func() { t.Fatal("bad parse") })
214 defer func() { os.Args = oldArgs }()
215 os.Args = []string{"cmd", "-before", "subcmd", "-after", "args"}
216 before := Bool("before", false, "")
217 if err := CommandLine().Parse(os.Args[1:]); err != nil {
222 after := Bool("after", false, "")
226 if !*before || cmd != "subcmd" || !*after || len(args) != 1 || args[0] != "args" {
227 t.Fatalf("expected true subcmd true [args] got %v %v %v %v", *before, cmd, *after, args)
231 // Test that -help invokes the usage message and returns ErrHelp.
232 func TestHelp(t *testing.T) {
233 var helpCalled = false
234 fs := NewFlagSet("help test", ContinueOnError)
235 fs.Usage = func() { helpCalled = true }
237 fs.BoolVar(&flag, "flag", false, "regular flag")
238 // Regular flag invocation should work
239 err := fs.Parse([]string{"-flag=true"})
241 t.Fatal("expected no error; got ", err)
244 t.Error("flag was not set by -flag")
247 t.Error("help called for regular flag")
248 helpCalled = false // reset for next test
250 // Help flag should work as expected.
251 err = fs.Parse([]string{"-help"})
253 t.Fatal("error expected")
256 t.Fatal("expected ErrHelp; got ", err)
259 t.Fatal("help was not called")
261 // If we define a help flag, that should override.
263 fs.BoolVar(&help, "help", false, "help flag")
265 err = fs.Parse([]string{"-help"})
267 t.Fatal("expected no error for defined -help; got ", err)
270 t.Fatal("help was called; should not have been for defined help flag")