diff --git a/package.json b/package.json
index 66134807..2388ade8 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,8 @@
     "lint": "eslint --ext .js,.vue src test/unit/specs test/e2e/specs"
   },
   "dependencies": {
+    "diff": "^3.0.1",
+    "karma-mocha-reporter": "^2.2.1",
     "moment": "^2.15.2",
     "node-sass": "^3.10.1",
     "sanitize-html": "^1.13.0",
diff --git a/test/unit/karma.conf.js b/test/unit/karma.conf.js
index ce413a43..78910f42 100644
--- a/test/unit/karma.conf.js
+++ b/test/unit/karma.conf.js
@@ -55,7 +55,7 @@ module.exports = function (config) {
     // 2. add it to the `browsers` array below.
     browsers: ['PhantomJS'],
     frameworks: ['mocha', 'sinon-chai'],
-    reporters: ['spec'],
+    reporters: ['mocha'],
     files: ['./index.js'],
     preprocessors: {
       './index.js': ['webpack', 'sourcemap']
@@ -64,6 +64,9 @@ module.exports = function (config) {
     webpackMiddleware: {
       noInfo: true
     },
+    mochaReporter: {
+      showDiff: true
+    },
     coverageReporter: {
       dir: './coverage',
       reporters: [
diff --git a/yarn.lock b/yarn.lock
index 189019c6..dad4e220 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1061,7 +1061,7 @@ chai@^3.5.0:
     deep-eql "^0.1.3"
     type-detect "^1.0.0"
 
-chalk@^1.0.0, chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3:
+chalk@^1.0.0, chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3, chalk@1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
   dependencies:
@@ -1656,6 +1656,10 @@ di@^0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/di/-/di-0.0.1.tgz#806649326ceaa7caa3306d75d985ea2748ba913c"
 
+diff:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/diff/-/diff-3.0.1.tgz#a52d90cc08956994be00877bff97110062582c35"
+
 diff@1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/diff/-/diff-1.4.0.tgz#7f28d2eb9ee7b15a97efd89ce63dcfdaa3ccbabf"
@@ -3141,6 +3145,12 @@ karma-coverage@^1.1.1:
     minimatch "^3.0.0"
     source-map "^0.5.1"
 
+karma-mocha-reporter:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/karma-mocha-reporter/-/karma-mocha-reporter-2.2.1.tgz#8508b2f0925433a6417f0c528e53fcb411745758"
+  dependencies:
+    chalk "1.1.3"
+
 karma-mocha@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/karma-mocha/-/karma-mocha-1.2.0.tgz#bca6be2a66805b847417e8d2873fd0b5b27ee7cd"