.

wcfs/internal/zdata/δftail_test.go

@@ -227,7 +227,15 @@ func testΔFtail(t_ *testing.T, testq chan ΔFTestEntry) {
 			t.Errorf(".trackSetZBlk:\n~have: %v\n want: %v", trackZinblk, Zinblk)
 		}
 
-		// XXX ForgetPast configured threshold
+		// ForgetPast configured threshold
+		const ncut = 4
+		if len(vδf) > ncut {
+			revcut := vδf[0].Rev
+			t.Logf("# forget ≤ @%s", xat[revcut])
+			δftail.ForgetPast(revcut)
+			vδf = vδf[1:]
+		}
+
 		// XXX verify SliceByFileRev + LastBlkRev
 	}
 }