// Copyright 2014-2015 The Docker & Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package mflag
import (
"bytes"
"fmt"
"os"
"sort"
"strings"
"testing"
"time"
)
// ResetForTesting clears all flag state and sets the usage function as directed.
// After calling ResetForTesting, parse errors in flag handling will not
// exit the program.
func ResetForTesting(usage func()) {
CommandLine = NewFlagSet(os.Args[0], ContinueOnError)
Usage = usage
}
func boolString(s string) string {
if s == "0" {
return "false"
}
return "true"
}
func TestEverything(t *testing.T) {
ResetForTesting(nil)
Bool([]string{"test_bool"}, false, "bool value")
Int([]string{"test_int"}, 0, "int value")
Int64([]string{"test_int64"}, 0, "int64 value")
Uint([]string{"test_uint"}, 0, "uint value")
Uint64([]string{"test_uint64"}, 0, "uint64 value")
String([]string{"test_string"}, "0", "string value")
Float64([]string{"test_float64"}, 0, "float64 value")
Duration([]string{"test_duration"}, 0, "time.Duration value")
m := make(map[string]*Flag)
desired := "0"
visitor := func(f *Flag) {
for _, name := range f.Names {
if len(name) > 5 && name[0:5] == "test_" {
m[name] = f
ok := false
switch {
case f.Value.String() == desired:
ok = true
case name == "test_bool" && f.Value.String() == boolString(desired):
ok = true
case name == "test_duration" && f.Value.String() == desired+"s":
ok = true
}
if !ok {
t.Error("Visit: bad value", f.Value.String(), "for", name)
}
}
}
}
VisitAll(visitor)
if len(m) != 8 {
t.Error("VisitAll misses some flags")
for k, v := range m {
t.Log(k, *v)
}
}
m = make(map[string]*Flag)
Visit(visitor)
if len(m) != 0 {
t.Errorf("Visit sees unset flags")
for k, v := range m {
t.Log(k, *v)
}
}
// Now set all flags
Set("test_bool", "true")
Set("test_int", "1")
Set("test_int64", "1")
Set("test_uint", "1")
Set("test_uint64", "1")
Set("test_string", "1")
Set("test_float64", "1")
Set("test_duration", "1s")
desired = "1"
Visit(visitor)
if len(m) != 8 {
t.Error("Visit fails after set")
for k, v := range m {
t.Log(k, *v)
}
}
// Now test they're visited in sort order.
var flagNames []string
Visit(func(f *Flag) {
for _, name := range f.Names {
flagNames = append(flagNames, name)
}
})
if !sort.StringsAreSorted(flagNames) {
t.Errorf("flag names not sorted: %v", flagNames)
}
}
func TestGet(t *testing.T) {
ResetForTesting(nil)
Bool([]string{"test_bool"}, true, "bool value")
Int([]string{"test_int"}, 1, "int value")
Int64([]string{"test_int64"}, 2, "int64 value")
Uint([]string{"test_uint"}, 3, "uint value")
Uint64([]string{"test_uint64"}, 4, "uint64 value")
String([]string{"test_string"}, "5", "string value")
Float64([]string{"test_float64"}, 6, "float64 value")
Duration([]string{"test_duration"}, 7, "time.Duration value")
visitor := func(f *Flag) {
for _, name := range f.Names {
if len(name) > 5 && name[0:5] == "test_" {
g, ok := f.Value.(Getter)
if !ok {
t.Errorf("Visit: value does not satisfy Getter: %T", f.Value)
return
}
switch name {
case "test_bool":
ok = g.Get() == true
case "test_int":
ok = g.Get() == int(1)
case "test_int64":
ok = g.Get() == int64(2)
case "test_uint":
ok = g.Get() == uint(3)
case "test_uint64":
ok = g.Get() == uint64(4)
case "test_string":
ok = g.Get() == "5"
case "test_float64":
ok = g.Get() == float64(6)
case "test_duration":
ok = g.Get() == time.Duration(7)
}
if !ok {
t.Errorf("Visit: bad value %T(%v) for %s", g.Get(), g.Get(), name)
}
}
}
}
VisitAll(visitor)
}
func testParse(f *FlagSet, t *testing.T) {
if f.Parsed() {
t.Error("f.Parse() = true before Parse")
}
boolFlag := f.Bool([]string{"bool"}, false, "bool value")
bool2Flag := f.Bool([]string{"bool2"}, false, "bool2 value")
f.Bool([]string{"bool3"}, false, "bool3 value")
bool4Flag := f.Bool([]string{"bool4"}, false, "bool4 value")
intFlag := f.Int([]string{"-int"}, 0, "int value")
int64Flag := f.Int64([]string{"-int64"}, 0, "int64 value")
uintFlag := f.Uint([]string{"uint"}, 0, "uint value")
uint64Flag := f.Uint64([]string{"-uint64"}, 0, "uint64 value")
stringFlag := f.String([]string{"string"}, "0", "string value")
f.String([]string{"string2"}, "0", "string2 value")
singleQuoteFlag := f.String([]string{"squote"}, "", "single quoted value")
doubleQuoteFlag := f.String([]string{"dquote"}, "", "double quoted value")
mixedQuoteFlag := f.String([]string{"mquote"}, "", "mixed quoted value")
mixed2QuoteFlag := f.String([]string{"mquote2"}, "", "mixed2 quoted value")
nestedQuoteFlag := f.String([]string{"nquote"}, "", "nested quoted value")
nested2QuoteFlag := f.String([]string{"nquote2"}, "", "nested2 quoted value")
float64Flag := f.Float64([]string{"float64"}, 0, "float64 value")
durationFlag := f.Duration([]string{"duration"}, 5*time.Second, "time.Duration value")
extra := "one-extra-argument"
args := []string{
"-bool",
"-bool2=true",
"-bool4=false",
"--int", "22",
"--int64", "0x23",
"-uint", "24",
"--uint64", "25",
"-string", "hello",
"-squote='single'",
`-dquote="double"`,
`-mquote='mixed"`,
`-mquote2="mixed2'`,
`-nquote="'single nested'"`,
`-nquote2='"double nested"'`,
"-float64", "2718e28",
"-duration", "2m",
extra,
}
if err := f.Parse(args); err != nil {
t.Fatal(err)
}
if !f.Parsed() {
t.Error("f.Parse() = false after Parse")
}
if *boolFlag != true {
t.Error("bool flag should be true, is ", *boolFlag)
}
if *bool2Flag != true {
t.Error("bool2 flag should be true, is ", *bool2Flag)
}
if !f.IsSet("bool2") {
t.Error("bool2 should be marked as set")
}
if f.IsSet("bool3") {
t.Error("bool3 should not be marked as set")
}
if !f.IsSet("bool4") {
t.Error("bool4 should be marked as set")
}
if *bool4Flag != false {
t.Error("bool4 flag should be false, is ", *bool4Flag)
}
if *intFlag != 22 {
t.Error("int flag should be 22, is ", *intFlag)
}
if *int64Flag != 0x23 {
t.Error("int64 flag should be 0x23, is ", *int64Flag)
}
if *uintFlag != 24 {
t.Error("uint flag should be 24, is ", *uintFlag)
}
if *uint64Flag != 25 {
t.Error("uint64 flag should be 25, is ", *uint64Flag)
}
if *stringFlag != "hello" {
t.Error("string flag should be `hello`, is ", *stringFlag)
}
if !f.IsSet("string") {
t.Error("string flag should be marked as set")
}
if f.IsSet("string2") {
t.Error("string2 flag should not be marked as set")
}
if *singleQuoteFlag != "single" {
t.Error("single quote string flag should be `single`, is ", *singleQuoteFlag)
}
if *doubleQuoteFlag != "double" {
t.Error("double quote string flag should be `double`, is ", *doubleQuoteFlag)
}
if *mixedQuoteFlag != `'mixed"` {
t.Error("mixed quote string flag should be `'mixed\"`, is ", *mixedQuoteFlag)
}
if *mixed2QuoteFlag != `"mixed2'` {
t.Error("mixed2 quote string flag should be `\"mixed2'`, is ", *mixed2QuoteFlag)
}
if *nestedQuoteFlag != "'single nested'" {
t.Error("nested quote string flag should be `'single nested'`, is ", *nestedQuoteFlag)
}
if *nested2QuoteFlag != `"double nested"` {
t.Error("double quote string flag should be `\"double nested\"`, is ", *nested2QuoteFlag)
}
if *float64Flag != 2718e28 {
t.Error("float64 flag should be 2718e28, is ", *float64Flag)
}
if *durationFlag != 2*time.Minute {
t.Error("duration flag should be 2m, is ", *durationFlag)
}
if len(f.Args()) != 1 {
t.Error("expected one argument, got", len(f.Args()))
} else if f.Args()[0] != extra {
t.Errorf("expected argument %q got %q", extra, f.Args()[0])
}
}
func testPanic(f *FlagSet, t *testing.T) {
f.Int([]string{"-int"}, 0, "int value")
if f.Parsed() {
t.Error("f.Parse() = true before Parse")
}
args := []string{
"-int", "21",
}
f.Parse(args)
}
func TestParsePanic(t *testing.T) {
ResetForTesting(func() {})
testPanic(CommandLine, t)
}
func TestParse(t *testing.T) {
ResetForTesting(func() { t.Error("bad parse") })
testParse(CommandLine, t)
}
func TestFlagSetParse(t *testing.T) {
testParse(NewFlagSet("test", ContinueOnError), t)
}
// Declare a user-defined flag type.
type flagVar []string
func (f *flagVar) String() string {
return fmt.Sprint([]string(*f))
}
func (f *flagVar) Set(value string) error {
*f = append(*f, value)
return nil
}
func TestUserDefined(t *testing.T) {
var flags FlagSet
flags.Init("test", ContinueOnError)
var v flagVar
flags.Var(&v, []string{"v"}, "usage")
if err := flags.Parse([]string{"-v", "1", "-v", "2", "-v=3"}); err != nil {
t.Error(err)
}
if len(v) != 3 {
t.Fatal("expected 3 args; got ", len(v))
}
expect := "[1 2 3]"
if v.String() != expect {
t.Errorf("expected value %q got %q", expect, v.String())
}
}
// Declare a user-defined boolean flag type.
type boolFlagVar struct {
count int
}
func (b *boolFlagVar) String() string {
return fmt.Sprintf("%d", b.count)
}
func (b *boolFlagVar) Set(value string) error {
if value == "true" {
b.count++
}
return nil
}
func (b *boolFlagVar) IsBoolFlag() bool {
return b.count < 4
}
func TestUserDefinedBool(t *testing.T) {
var flags FlagSet
flags.Init("test", ContinueOnError)
var b boolFlagVar
var err error
flags.Var(&b, []string{"b"}, "usage")
if err = flags.Parse([]string{"-b", "-b", "-b", "-b=true", "-b=false", "-b", "barg", "-b"}); err != nil {
if b.count < 4 {
t.Error(err)
}
}
if b.count != 4 {
t.Errorf("want: %d; got: %d", 4, b.count)
}
if err == nil {
t.Error("expected error; got none")
}
}
func TestSetOutput(t *testing.T) {
var flags FlagSet
var buf bytes.Buffer
flags.SetOutput(&buf)
flags.Init("test", ContinueOnError)
flags.Parse([]string{"-unknown"})
if out := buf.String(); !strings.Contains(out, "-unknown") {
t.Logf("expected output mentioning unknown; got %q", out)
}
}
// This tests that one can reset the flags. This still works but not well, and is
// superseded by FlagSet.
func TestChangingArgs(t *testing.T) {
ResetForTesting(func() { t.Fatal("bad parse") })
oldArgs := os.Args
defer func() { os.Args = oldArgs }()
os.Args = []string{"cmd", "-before", "subcmd", "-after", "args"}
before := Bool([]string{"before"}, false, "")
if err := CommandLine.Parse(os.Args[1:]); err != nil {
t.Fatal(err)
}
cmd := Arg(0)
os.Args = Args()
after := Bool([]string{"after"}, false, "")
Parse()
args := Args()
if !*before || cmd != "subcmd" || !*after || len(args) != 1 || args[0] != "args" {
t.Fatalf("expected true subcmd true [args] got %v %v %v %v", *before, cmd, *after, args)
}
}
// Test that -help invokes the usage message and returns ErrHelp.
func TestHelp(t *testing.T) {
var helpCalled = false
fs := NewFlagSet("help test", ContinueOnError)
fs.Usage = func() { helpCalled = true }
var flag bool
fs.BoolVar(&flag, []string{"flag"}, false, "regular flag")
// Regular flag invocation should work
err := fs.Parse([]string{"-flag=true"})
if err != nil {
t.Fatal("expected no error; got ", err)
}
if !flag {
t.Error("flag was not set by -flag")
}
if helpCalled {
t.Error("help called for regular flag")
helpCalled = false // reset for next test
}
// Help flag should work as expected.
err = fs.Parse([]string{"-help"})
if err == nil {
t.Fatal("error expected")
}
if err != ErrHelp {
t.Fatal("expected ErrHelp; got ", err)
}
if !helpCalled {
t.Fatal("help was not called")
}
// If we define a help flag, that should override.
var help bool
fs.BoolVar(&help, []string{"help"}, false, "help flag")
helpCalled = false
err = fs.Parse([]string{"-help"})
if err != nil {
t.Fatal("expected no error for defined -help; got ", err)
}
if helpCalled {
t.Fatal("help was called; should not have been for defined help flag")
}
}
// Test the flag count functions.
func TestFlagCounts(t *testing.T) {
fs := NewFlagSet("help test", ContinueOnError)
var flag bool
fs.BoolVar(&flag, []string{"flag1"}, false, "regular flag")
fs.BoolVar(&flag, []string{"#deprecated1"}, false, "regular flag")
fs.BoolVar(&flag, []string{"f", "flag2"}, false, "regular flag")
fs.BoolVar(&flag, []string{"#d", "#deprecated2"}, false, "regular flag")
fs.BoolVar(&flag, []string{"flag3"}, false, "regular flag")
fs.BoolVar(&flag, []string{"g", "#flag4", "-flag4"}, false, "regular flag")
if fs.FlagCount() != 6 {
t.Fatal("FlagCount wrong. ", fs.FlagCount())
}
if fs.FlagCountUndeprecated() != 4 {
t.Fatal("FlagCountUndeprecated wrong. ", fs.FlagCountUndeprecated())
}
if fs.NFlag() != 0 {
t.Fatal("NFlag wrong. ", fs.NFlag())
}
err := fs.Parse([]string{"-fd", "-g", "-flag4"})
if err != nil {
t.Fatal("expected no error for defined -help; got ", err)
}
if fs.NFlag() != 4 {
t.Fatal("NFlag wrong. ", fs.NFlag())
}
}
// Show up bug in sortFlags
func TestSortFlags(t *testing.T) {
fs := NewFlagSet("help TestSortFlags", ContinueOnError)
var err error
var b bool
fs.BoolVar(&b, []string{"b", "-banana"}, false, "usage")
err = fs.Parse([]string{"--banana=true"})
if err != nil {
t.Fatal("expected no error; got ", err)
}
count := 0
fs.VisitAll(func(flag *Flag) {
count++
if flag == nil {
t.Fatal("VisitAll should not return a nil flag")
}
})
flagcount := fs.FlagCount()
if flagcount != count {
t.Fatalf("FlagCount (%d) != number (%d) of elements visited", flagcount, count)
}
// Make sure its idempotent
if flagcount != fs.FlagCount() {
t.Fatalf("FlagCount (%d) != fs.FlagCount() (%d) of elements visited", flagcount, fs.FlagCount())
}
count = 0
fs.Visit(func(flag *Flag) {
count++
if flag == nil {
t.Fatal("Visit should not return a nil flag")
}
})
nflag := fs.NFlag()
if nflag != count {
t.Fatalf("NFlag (%d) != number (%d) of elements visited", nflag, count)
}
if nflag != fs.NFlag() {
t.Fatalf("NFlag (%d) != fs.NFlag() (%d) of elements visited", nflag, fs.NFlag())
}
}