1 files changed, 53 insertions, 0 deletions
diff --git a/eth/sync_test.go b/eth/sync_test.go
new file mode 100644
index 000000000..f3a6718ab
--- /dev/null
+++ b/eth/sync_test.go
@@ -0,0 +1,53 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package eth
+
+import (
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/p2p/discover"
+)
+
+// Tests that fast sync gets disabled as soon as a real block is successfully
+// imported into the blockchain.
+func TestFastSyncDisabling(t *testing.T) {
+	// Create a pristine protocol manager, check that fast sync is left enabled
+	pmEmpty := newTestProtocolManagerMust(t, true, 0, nil, nil)
+	if !pmEmpty.fastSync {
+		t.Fatalf("fast sync disabled on pristine blockchain")
+	}
+	// Create a full protocol manager, check that fast sync gets disabled
+	pmFull := newTestProtocolManagerMust(t, true, 1024, nil, nil)
+	if pmFull.fastSync {
+		t.Fatalf("fast sync not disabled on non-empty blockchain")
+	}
+	// Sync up the two peers
+	io1, io2 := p2p.MsgPipe()
+
+	go pmFull.handle(pmFull.newPeer(63, NetworkId, p2p.NewPeer(discover.NodeID{}, "empty", nil), io2))
+	go pmEmpty.handle(pmEmpty.newPeer(63, NetworkId, p2p.NewPeer(discover.NodeID{}, "full", nil), io1))
+
+	time.Sleep(250 * time.Millisecond)
+	pmEmpty.synchronise(pmEmpty.peers.BestPeer())
+
+	// Check that fast sync was disabled
+	if pmEmpty.fastSync {
+		t.Fatalf("fast sync not disabled after successful synchronisation")
+	}
+}