forked from ebhomengo/niki
103 lines
3.2 KiB
Go
103 lines
3.2 KiB
Go
//go:build go1.21
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// +build go1.21
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package pflag
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import (
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"errors"
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"flag"
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"io"
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"strings"
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"testing"
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)
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func TestFuncCompat(t *testing.T) {
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// compare behavior with the stdlib 'flag' package
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type FuncFlagSet interface {
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Func(name string, usage string, fn func(string) error)
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Parse([]string) error
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}
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unitTestErr := errors.New("unit test error")
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runCase := func(f FuncFlagSet, name string, args []string) (values []string, err error) {
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fn := func(s string) error {
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values = append(values, s)
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if s == "err" {
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return unitTestErr
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}
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return nil
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}
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f.Func(name, "Callback function", fn)
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err = f.Parse(args)
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return values, err
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}
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t.Run("regular parsing", func(t *testing.T) {
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flagName := "fnflag"
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args := []string{"--fnflag=xx", "--fnflag", "yy", "--fnflag=zz"}
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stdFSet := flag.NewFlagSet("std test", flag.ContinueOnError)
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stdValues, err := runCase(stdFSet, flagName, args)
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if err != nil {
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t.Fatalf("std flag: expected no error, got %v", err)
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}
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expected := []string{"xx", "yy", "zz"}
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if !cmpLists(expected, stdValues) {
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t.Fatalf("std flag: expected %v, got %v", expected, stdValues)
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}
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fset := NewFlagSet("pflag test", ContinueOnError)
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pflagValues, err := runCase(fset, flagName, args)
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if err != nil {
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t.Fatalf("pflag: expected no error, got %v", err)
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}
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if !cmpLists(stdValues, pflagValues) {
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t.Fatalf("pflag: expected %v, got %v", stdValues, pflagValues)
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}
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})
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t.Run("error triggered by callback", func(t *testing.T) {
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flagName := "fnflag"
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args := []string{"--fnflag", "before", "--fnflag", "err", "--fnflag", "after"}
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// test behavior of standard flag.Fset with an error triggered by the callback:
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// (note: as can be seen in 'runCase()', if the callback sees "err" as a value
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// for the flag, it will return an error)
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stdFSet := flag.NewFlagSet("std test", flag.ContinueOnError)
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stdFSet.SetOutput(io.Discard) // suppress output
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// run test case with standard flag.Fset
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stdValues, err := runCase(stdFSet, flagName, args)
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// double check the standard behavior:
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// - .Parse() should return an error, which contains the error message
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if err == nil {
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t.Fatalf("std flag: expected an error triggered by callback, got no error instead")
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}
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if !strings.HasSuffix(err.Error(), unitTestErr.Error()) {
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t.Fatalf("std flag: expected unittest error, got unexpected error value: %T %v", err, err)
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}
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// - the function should have been called twice, with the first two values,
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// the final "=after" should not be recorded
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expected := []string{"before", "err"}
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if !cmpLists(expected, stdValues) {
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t.Fatalf("std flag: expected %v, got %v", expected, stdValues)
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}
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// now run the test case on a pflag FlagSet:
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fset := NewFlagSet("pflag test", ContinueOnError)
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pflagValues, err := runCase(fset, flagName, args)
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// check that there is a similar error (note: pflag will _wrap_ the error, while the stdlib
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// currently keeps the original message but creates a flat errors.Error)
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if !errors.Is(err, unitTestErr) {
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t.Fatalf("pflag: got unexpected error value: %T %v", err, err)
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}
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// the callback should be called the same number of times, with the same values:
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if !cmpLists(stdValues, pflagValues) {
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t.Fatalf("pflag: expected %v, got %v", stdValues, pflagValues)
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}
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})
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}
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