| 12 | ) |
| 13 | |
| 14 | func TestFuncCompat(t *testing.T) { |
| 15 | // compare behavior with the stdlib 'flag' package |
| 16 | type FuncFlagSet interface { |
| 17 | Func(name string, usage string, fn func(string) error) |
| 18 | Parse([]string) error |
| 19 | } |
| 20 | |
| 21 | unitTestErr := errors.New("unit test error") |
| 22 | runCase := func(f FuncFlagSet, name string, args []string) (values []string, err error) { |
| 23 | fn := func(s string) error { |
| 24 | values = append(values, s) |
| 25 | if s == "err" { |
| 26 | return unitTestErr |
| 27 | } |
| 28 | return nil |
| 29 | } |
| 30 | f.Func(name, "Callback function", fn) |
| 31 | |
| 32 | err = f.Parse(args) |
| 33 | return values, err |
| 34 | } |
| 35 | |
| 36 | t.Run("regular parsing", func(t *testing.T) { |
| 37 | flagName := "fnflag" |
| 38 | args := []string{"--fnflag=xx", "--fnflag", "yy", "--fnflag=zz"} |
| 39 | |
| 40 | stdFSet := flag.NewFlagSet("std test", flag.ContinueOnError) |
| 41 | stdValues, err := runCase(stdFSet, flagName, args) |
| 42 | if err != nil { |
| 43 | t.Fatalf("std flag: expected no error, got %v", err) |
| 44 | } |
| 45 | expected := []string{"xx", "yy", "zz"} |
| 46 | if !cmpLists(expected, stdValues) { |
| 47 | t.Fatalf("std flag: expected %v, got %v", expected, stdValues) |
| 48 | } |
| 49 | |
| 50 | fset := NewFlagSet("pflag test", ContinueOnError) |
| 51 | pflagValues, err := runCase(fset, flagName, args) |
| 52 | if err != nil { |
| 53 | t.Fatalf("pflag: expected no error, got %v", err) |
| 54 | } |
| 55 | if !cmpLists(stdValues, pflagValues) { |
| 56 | t.Fatalf("pflag: expected %v, got %v", stdValues, pflagValues) |
| 57 | } |
| 58 | }) |
| 59 | |
| 60 | t.Run("error triggered by callback", func(t *testing.T) { |
| 61 | flagName := "fnflag" |
| 62 | args := []string{"--fnflag", "before", "--fnflag", "err", "--fnflag", "after"} |
| 63 | |
| 64 | // test behavior of standard flag.Fset with an error triggered by the callback: |
| 65 | // (note: as can be seen in 'runCase()', if the callback sees "err" as a value |
| 66 | // for the flag, it will return an error) |
| 67 | stdFSet := flag.NewFlagSet("std test", flag.ContinueOnError) |
| 68 | stdFSet.SetOutput(io.Discard) // suppress output |
| 69 | |
| 70 | // run test case with standard flag.Fset |
| 71 | stdValues, err := runCase(stdFSet, flagName, args) |