.

wcfs/internal/zdata/δftail_test.go

@@ -108,9 +108,19 @@ func testΔFtail(t_ *testing.T, testq chan ΔFTestEntry) {
 		dataTab[zblki.Name] = zblki.Data
 	}
 
+	xat := map[zodb.Tid]string{} // tid > "at<i>"
+
+	// δfstr converts δf to string taking xat into account
+	δfstr := func(δf *ΔFile) string {
+		s := fmt.Sprintf("{@%s %s", xat[δf.Rev], δf.Blocks)
+		if δf.Size {
+			s += " S"
+		}
+		s += "}"
+		return s
+	}
 
 	i := 0
-	xat := map[zodb.Tid]string{} // tid > "at<i>"
 	for test := range testq {
 		i++
 		δblk := setI64{}
@@ -250,7 +260,14 @@ func testΔFtail(t_ *testing.T, testq chan ΔFTestEntry) {
 				vδf_ok := vδf[j:k+1] // [j,k]
 				vδf_ := δftail.SliceByFileRev(zfile, lo, hi)
 				if !reflect.DeepEqual(vδf_, vδf_ok) {
-					t.Errorf("slice (@%s,@%s]:\nhave: %v\nwant: %v", xat[lo], xat[hi], vδf_, vδf_ok)
+					var sδf_, sδf_ok []string
+					for _, δf := range vδf_ {
+						sδf_ = append(sδf_, δfstr(δf))
+					}
+					for _, δf := range vδf_ok {
+						sδf_ok = append(sδf_ok, δfstr(δf))
+					}
+					t.Errorf("slice (@%s,@%s]:\nhave: %v\nwant: %v", xat[lo], xat[hi], sδf_, sδf_ok)
 				}
 			}
 		}