diff --git a/chain/sync_test.go b/chain/sync_test.go
new file mode 100644
index 000000000..acd700fa7
--- /dev/null
+++ b/chain/sync_test.go
@@ -0,0 +1,81 @@
+package chain_test
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"testing"
+
+	mocknet "github.com/libp2p/go-libp2p/p2p/net/mock"
+
+	"github.com/filecoin-project/go-lotus/api"
+	"github.com/filecoin-project/go-lotus/chain/gen"
+	"github.com/filecoin-project/go-lotus/node"
+	"github.com/filecoin-project/go-lotus/node/modules"
+	modtest "github.com/filecoin-project/go-lotus/node/modules/testing"
+	"github.com/filecoin-project/go-lotus/node/repo"
+)
+
+func repoWithChain(t *testing.T, h int) repo.Repo {
+	g, err := gen.NewGenerator()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for i := 0; i < h; i++ {
+		b, err := g.NextBlock()
+		if err != nil {
+			t.Fatalf("error at H:%d, %s", i, err)
+		}
+		if b.Header.Height != uint64(i+1) {
+			t.Fatal("wrong height")
+		}
+	}
+
+	r, err := g.YieldRepo()
+	if err != nil {
+		t.Fatal(err)
+	}
+	return r
+}
+
+func TestSyncSimple(t *testing.T) {
+	ctx := context.Background()
+
+	var genbuf bytes.Buffer
+	var source api.FullNode
+	var client api.FullNode
+
+	mn := mocknet.New(ctx)
+
+	err := node.New(ctx,
+		node.FullAPI(&source),
+		node.Online(),
+		node.Repo(repoWithChain(t, 20)),
+		node.MockHost(mn),
+
+		node.Override(new(modules.Genesis), modtest.MakeGenesisMem(&genbuf)),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	b, err := source.ChainHead(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Println(b.Height())
+
+	err = node.New(ctx,
+		node.FullAPI(&client),
+		node.Online(),
+		node.Repo(repo.NewMemory(nil)),
+		node.MockHost(mn),
+
+		node.Override(new(modules.Genesis), modules.LoadGenesis(genbuf.Bytes())),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+}
diff --git a/node/node_test.go b/node/node_test.go
index a9fda6378..f120d508e 100644
--- a/node/node_test.go
+++ b/node/node_test.go
@@ -40,7 +40,7 @@ func builder(t *testing.T, n int) []api.FullNode {
 			node.FullAPI(&out[i]),
 			node.Online(),
 			node.Repo(repo.NewMemory(nil)),
-			MockHost(mn),
+			node.MockHost(mn),
 
 			genesis,
 		)
diff --git a/node/opts_test.go b/node/opts_test.go
deleted file mode 100644
index 60e024a84..000000000
--- a/node/opts_test.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package node_test
-
-import (
-	"errors"
-
-	"github.com/filecoin-project/go-lotus/node"
-
-	"github.com/filecoin-project/go-lotus/node/modules/lp2p"
-	mocknet "github.com/libp2p/go-libp2p/p2p/net/mock"
-)
-
-func MockHost(mn mocknet.Mocknet) node.Option {
-	return node.Options(
-		node.ApplyIf(func(s *node.Settings) bool { return !s.Online },
-			node.Error(errors.New("MockHost must be specified after Online")),
-		),
-
-		node.Override(new(lp2p.RawHost), lp2p.MockHost),
-		node.Override(new(mocknet.Mocknet), mn),
-	)
-}
diff --git a/node/testopts.go b/node/testopts.go
new file mode 100644
index 000000000..5ec7a66bc
--- /dev/null
+++ b/node/testopts.go
@@ -0,0 +1,20 @@
+package node
+
+import (
+	"errors"
+
+	mocknet "github.com/libp2p/go-libp2p/p2p/net/mock"
+
+	"github.com/filecoin-project/go-lotus/node/modules/lp2p"
+)
+
+func MockHost(mn mocknet.Mocknet) Option {
+	return Options(
+		ApplyIf(func(s *Settings) bool { return !s.Online },
+			Error(errors.New("MockHost must be specified after Online")),
+		),
+
+		Override(new(lp2p.RawHost), lp2p.MockHost),
+		Override(new(mocknet.Mocknet), mn),
+	)
+}