server/config: Generic caching backend.

server/config/caching/codec_test.go

Index: server/config/caching/codec_test.go
diff --git a/server/config/caching/codec_test.go b/server/config/caching/codec_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..3c5ed08bf6fdeb4317fc8cbe02888411196d1db8
--- /dev/null
+++ b/server/config/caching/codec_test.go
@@ -0,0 +1,31 @@
+// Copyright 2015 The LUCI Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package caching
+
+import (
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestHashParams(t *testing.T) {
+	t.Parallel()
+
+	Convey(`Testing HashParams`, t, func() {
+		// Can't cheat w/ strings including "\x00" (escaping).
+		//
+		// Without escaping:
+		// ["A\x00B"] => A 0x00 B 0x00
+		// ["A" "B"]  => A 0x00 B 0x00
+		So(HashParams("A\x00B"), ShouldNotResemble, HashParams("A", "B"))
+
+		// Can't cheat with different lengths (length prefix).
+		//
+		// After escaping, but with no length prefix:
+		// ["A\x00" ""]     => A 0x00 0x00 0x00 0x00
+		// ["A" "" "" ""]   => A 0x00 0x00 0x00 0x00
+		So(HashParams("A\x00", ""), ShouldNotResemble, HashParams("A", "", "", ""))
+	})
+}