Added test config files.

config/test/default.yml

@@ -0,0 +1 @@
+../default.yml

config/test/test.yml

@@ -0,0 +1,5 @@
+
+cache:
+  # make cache optionnal so we can disable it for testing
+  optional: true
+

package.json

@@ -5,7 +5,7 @@
   "main": "./lib/index.js",
   "scripts": {
     "pretest": "jscs lib test && jshint lib test",
-    "test": "NODE_ENV=test mocha -R spec -u exports test/tests/",
+    "test": "NODE_ENV=test NODE_CONFIG_DIR=./config/test mocha -R spec -u exports test/tests/",
     "start": "node lib/index.js"
   },
   "repository": {