.

go/zodb/storage/demo/demo_test.go

@@ -77,9 +77,28 @@ func withDemoStorage(t *testing.T, f func(t *testing.T, dsrv *Storage/*XXX -> Sr
 	}
 
 	// verify on all combinations of preload being split into base+δ 
+	work := xtempdir(t)
+	defer os.RemoveAll(work)
+	test1 := func(δstart zodb.Tid, zdumpBase, zdumpδ string) {
+		t.Helper()
+		t.Run(fmt.Sprintf("δstart=%s", δstart), func(t *testinf,T) {
+			t.Helper()
+			X := xtesting.FatalIf(t)
+			work1 := filepath.Join(work, δstart.String())
+			err := os.Mkdir(work1, 0x777); X(err)
 
-/*
-	txnv, err := xtesting.LoadDBHistory(opt.Preload); X(err)
-	_ = txnv
-*/
+			_, err = xtesting.ZPyRestore(work1+"/base.fs", zdumpBase); X(err)
+			// XXX vvv change to demo:(base)/(δ)
+			_, err = xtesting.ZPyRestore(work1+"/δ.fs", zdumpδ);       X(err)
+
+			d = openDemo(base, δ); X(err)
+			defer d.Close()
+			f(t, d)
+		})
+	}
+	for i := 0; i < len(txnv); i++ {
+		δstart = txnv[i]
+		test1(δstart.tid, zdump[:δstart.pos], zdump[δstart.pos:])
+	}
+	test1(zodb.TidMax, zdump, "")
 }