config: implement TextMarshaler for LogLevel

Signed-off-by: Hank Donnay <hdonnay@redhat.com>

config/enums.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"encoding"
+	"errors"
 	"fmt"
 	"strings"
 )
@@ -75,5 +76,20 @@ func (l *LogLevel) UnmarshalText(b []byte) (err error) {
 	return nil
 }
 
-// Assert LogLevel implements TextUnmarshaler.
-var _ encoding.TextUnmarshaler = (*LogLevel)(nil)
+// MarshalText implements encoding.TextMarshaler.
+func (l *LogLevel) MarshalText() ([]byte, error) {
+	if l == nil {
+		return nil, errors.New("invalid LogLevel pointer: <nil>")
+	}
+	i := *l
+	if i < 0 || i >= LogLevel(len(_LogLevel_index)-1) {
+		return nil, fmt.Errorf("invalid LogLevel: %q", l.String())
+	}
+	return []byte(_LogLevel_name[_LogLevel_index[i]:_LogLevel_index[i+1]]), nil
+}
+
+// Assert LogLevel implements TextUnmarshaler and TextMarshaler.
+var (
+	_ encoding.TextUnmarshaler = (*LogLevel)(nil)
+	_ encoding.TextMarshaler   = (*LogLevel)(nil)
+)

config/enums_test.go

@@ -0,0 +1,47 @@
+package config_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/quay/clair/config"
+)
+
+func TestEnumMarshal(t *testing.T) {
+	t.Run("LogLevel", func(t *testing.T) {
+		tt := [][]byte{
+			[]byte("info"),
+			[]byte("debug-color"),
+			[]byte("debug"),
+			[]byte("warn"),
+			[]byte("error"),
+			[]byte("fatal"),
+			[]byte("panic"),
+		}
+		t.Run("Marshal", func(t *testing.T) {
+			for i, want := range tt {
+				l := config.LogLevel(i)
+				got, err := l.MarshalText()
+				if err != nil {
+					t.Error(err)
+					continue
+				}
+				if !bytes.Equal(got, want) {
+					t.Errorf("got: %q, want: %q", got, want)
+				}
+			}
+		})
+		t.Run("Unmarshal", func(t *testing.T) {
+			for want, in := range tt {
+				var l config.LogLevel
+				if err := l.UnmarshalText(in); err != nil {
+					t.Error(err)
+					continue
+				}
+				if got := int(l); got != want {
+					t.Errorf("got: %q, want: %q", got, want)
+				}
+			}
+		})
+	})
+}