lib/encoder: add string rendering and parsing for encodings

lib/encoder/encoder_test.go

@@ -1,12 +1,68 @@
 package encoder
 
 import (
+	"fmt"
 	"regexp"
 	"strconv"
 	"strings"
 	"testing"
+
+	"github.com/spf13/pflag"
+	"github.com/stretchr/testify/assert"
 )
 
+// Check it satisfies the interfaces
+var (
+	_ pflag.Value = (*MultiEncoder)(nil)
+	_ fmt.Scanner = (*MultiEncoder)(nil)
+)
+
+func TestEncodeString(t *testing.T) {
+	for _, test := range []struct {
+		mask uint
+		want string
+	}{
+		{0, "None"},
+		{EncodeZero, "None"},
+		{EncodeDoubleQuote, "DoubleQuote"},
+		{EncodeDot, "Dot"},
+		{EncodeWin, "LtGt,DoubleQuote,Colon,Question,Asterisk,Pipe"},
+		{EncodeHashPercent, "Hash,Percent"},
+		{EncodeSlash | EncodeDollar | EncodeColon, "Slash,Dollar,Colon"},
+		{EncodeSlash | (1 << 31), "Slash,0x80000000"},
+	} {
+		got := MultiEncoder(test.mask).String()
+		assert.Equal(t, test.want, got)
+	}
+
+}
+
+func TestEncodeSet(t *testing.T) {
+	for _, test := range []struct {
+		in      string
+		want    uint
+		wantErr bool
+	}{
+		{"", 0, true},
+		{"None", 0, false},
+		{"None", EncodeZero, false},
+		{"DoubleQuote", EncodeDoubleQuote, false},
+		{"Dot", EncodeDot, false},
+		{"LtGt,DoubleQuote,Colon,Question,Asterisk,Pipe", EncodeWin, false},
+		{"Hash,Percent", EncodeHashPercent, false},
+		{"Slash,Dollar,Colon", EncodeSlash | EncodeDollar | EncodeColon, false},
+		{"Slash,0x80000000", EncodeSlash | (1 << 31), false},
+		{"Blerp", 0, true},
+		{"0xFGFFF", 0, true},
+	} {
+		var got MultiEncoder
+		err := got.Set(test.in)
+		assert.Equal(t, test.wantErr, err != nil, err)
+		assert.Equal(t, MultiEncoder(test.want), got, test.in)
+	}
+
+}
+
 type testCase struct {
 	mask uint
 	in   string