.

wcfs/internal/zdata/δftail_test.go

@@ -28,6 +28,8 @@ package zdata
 import (
 	"context"
 	"fmt"
+	"sort"
+	"strings"
 	"testing"
 
 	"lab.nexedi.com/kirr/go123/exc"
@@ -171,8 +173,24 @@ func TestΔFtail(t_ *testing.T) {
 
 
 // dataTabTxt returns string representation of {} dataTab.
-//
-// it is similar to xbtreetest.KVTxt but uses string instead of Key for keys.
 func dataTabTxt(dataTab map[string]string) string {
-	panic("TODO")
+	// XXX dup wrt xbtreetest.KVTxt but uses string instead of Key for keys.
+	if len(dataTab) == 0 {
+		return "ø"
+	}
+
+	keyv := []string{}
+	for k := range dataTab { keyv = append(keyv, k) }
+	sort.Strings(keyv)
+
+	sv := []string{}
+	for _, k := range keyv {
+		v := dataTab[k]
+		if strings.ContainsAny(v, " \n\t,:") {
+			panicf("[%v]=%q: invalid value", k, v)
+		}
+		sv = append(sv, fmt.Sprintf("%v:%s", k, v))
+	}
+
+	return strings.Join(sv, ",")
 }