[fix test] Update nconf.stores.File to respond with an error when loading malformed JSON async

.gitignore

@@ -1,6 +1,7 @@
 .DS_Store
 config.json
 test/fixtures/*.json
+!test/fixtures/malformed.json
 node_modules/
 node_modules/*
 npm-debug.log

lib/nconf/stores/file.js

@@ -95,9 +95,14 @@ File.prototype.load = function (callback) {
       return callback(err);
     }
     
-    data = self.format.parse(data.toString());
-    self.store = data;
+    try {
+      self.store = self.format.parse(data.toString());
       callback(null, self.store);
+    }
+    catch (ex) {
+      self.store = {};
+      callback(ex);
+    }
   });
 };
 

test/file-store-test.js

@@ -30,6 +30,21 @@ vows.describe('nconf/stores/file').addBatch({
         assert.deepEqual(data, store.store);
       }
     }
+  },
+  "When using the nconf file store": {
+    topic: function () {
+      var filePath = path.join(__dirname, 'fixtures', 'malformed.json');
+      store = new nconf.stores.File({ file: filePath });
+      return null;
+    },
+    "the load() method with a malformed JSON config file": {
+      topic: function () {
+        store.load(this.callback.bind(null, null));
+      },
+      "should respond with an error": function (ign, err) {
+        console.dir(err);
+      }
+    }
   }
 }).addBatch({
   "When using the nconf file store": {

test/fixtures/malformed.json

@@ -0,0 +1,3 @@
+{
+  "literal": "bazz",
+}