1 files changed, 53 insertions, 0 deletions
diff --git a/swarm/multihash/multihash_test.go b/swarm/multihash/multihash_test.go
new file mode 100644
index 000000000..85df741dd
--- /dev/null
+++ b/swarm/multihash/multihash_test.go
@@ -0,0 +1,53 @@
+// Copyright 2018 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 multihash
+
+import (
+	"bytes"
+	"math/rand"
+	"testing"
+)
+
+// parse multihash, and check that invalid multihashes fail
+func TestCheckMultihash(t *testing.T) {
+	hashbytes := make([]byte, 32)
+	c, err := rand.Read(hashbytes)
+	if err != nil {
+		t.Fatal(err)
+	} else if c < 32 {
+		t.Fatal("short read")
+	}
+
+	expected := ToMultihash(hashbytes)
+
+	l, hl, _ := GetMultihashLength(expected)
+	if l != 32 {
+		t.Fatalf("expected length %d, got %d", 32, l)
+	} else if hl != 2 {
+		t.Fatalf("expected header length %d, got %d", 2, hl)
+	}
+	if _, _, err := GetMultihashLength(expected[1:]); err == nil {
+		t.Fatal("expected failure on corrupt header")
+	}
+	if _, _, err := GetMultihashLength(expected[:len(expected)-2]); err == nil {
+		t.Fatal("expected failure on short content")
+	}
+	dh, _ := FromMultihash(expected)
+	if !bytes.Equal(dh, hashbytes) {
+		t.Fatalf("expected content hash %x, got %x", hashbytes, dh)
+	}
+}