1 files changed, 85 insertions, 0 deletions
diff --git a/miner/unconfirmed_test.go b/miner/unconfirmed_test.go
new file mode 100644
index 000000000..456af1764
--- /dev/null
+++ b/miner/unconfirmed_test.go
@@ -0,0 +1,85 @@
+// Copyright 2016 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 miner
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// noopHeaderRetriever is an implementation of headerRetriever that always
+// returns nil for any requested headers.
+type noopHeaderRetriever struct{}
+
+func (r *noopHeaderRetriever) GetHeaderByNumber(number uint64) *types.Header {
+	return nil
+}
+
+// Tests that inserting blocks into the unconfirmed set accumulates them until
+// the desired depth is reached, after which they begin to be dropped.
+func TestUnconfirmedInsertBounds(t *testing.T) {
+	limit := uint(10)
+
+	pool := newUnconfirmedBlocks(new(noopHeaderRetriever), limit)
+	for depth := uint64(0); depth < 2*uint64(limit); depth++ {
+		// Insert multiple blocks for the same level just to stress it
+		for i := 0; i < int(depth); i++ {
+			pool.Insert(depth, common.Hash([32]byte{byte(depth), byte(i)}))
+		}
+		// Validate that no blocks below the depth allowance are left in
+		pool.blocks.Do(func(block interface{}) {
+			if block := block.(*unconfirmedBlock); block.index+uint64(limit) <= depth {
+				t.Errorf("depth %d: block %x not dropped", depth, block.hash)
+			}
+		})
+	}
+}
+
+// Tests that shifting blocks out of the unconfirmed set works both for normal
+// cases as well as for corner cases such as empty sets, empty shifts or full
+// shifts.
+func TestUnconfirmedShifts(t *testing.T) {
+	// Create a pool with a few blocks on various depths
+	limit, start := uint(10), uint64(25)
+
+	pool := newUnconfirmedBlocks(new(noopHeaderRetriever), limit)
+	for depth := start; depth < start+uint64(limit); depth++ {
+		pool.Insert(depth, common.Hash([32]byte{byte(depth)}))
+	}
+	// Try to shift below the limit and ensure no blocks are dropped
+	pool.Shift(start + uint64(limit) - 1)
+	if n := pool.blocks.Len(); n != int(limit) {
+		t.Errorf("unconfirmed count mismatch: have %d, want %d", n, limit)
+	}
+	// Try to shift half the blocks out and verify remainder
+	pool.Shift(start + uint64(limit) - 1 + uint64(limit/2))
+	if n := pool.blocks.Len(); n != int(limit)/2 {
+		t.Errorf("unconfirmed count mismatch: have %d, want %d", n, limit/2)
+	}
+	// Try to shift all the remaining blocks out and verify emptyness
+	pool.Shift(start + 2*uint64(limit))
+	if n := pool.blocks.Len(); n != 0 {
+		t.Errorf("unconfirmed count mismatch: have %d, want %d", n, 0)
+	}
+	// Try to shift out from the empty set and make sure it doesn't break
+	pool.Shift(start + 3*uint64(limit))
+	if n := pool.blocks.Len(); n != 0 {
+		t.Errorf("unconfirmed count mismatch: have %d, want %d", n, 0)
+	}
+}