diff --git a/karma.conf.js b/karma.conf.js
index f786cb1..87efb5a 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -1,15 +1,17 @@
 const webpackEnv = {test: true}
 const webpackConfig = require('./webpack.config')(webpackEnv)
 process.env.BABEL_ENV = 'test' // so we load the correct babel plugins
-const fileGlob = 'src/js/**/*.test.js'
+const testGlob = 'src/js/**/*.test.js'
+const srcGlob = 'src/js/**/*!(test|stub).js'
 
 module.exports = function setKarmaConfig(config) {
   config.set({
     basePath: '',
     frameworks: ['mocha', 'chai'],
-    files: [fileGlob],
+    files: [testGlob, srcGlob],
     preprocessors: {
-      [fileGlob]: ['webpack']
+      [testGlob]: ['webpack'],
+      [srcGlob]: ['webpack'],
     },
     webpack: webpackConfig,
     webpackMiddleware: {noInfo: true},
diff --git a/package.json b/package.json
index ce7b65a..e490e4a 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
     "eslint-config-kentcdodds": "6.2.1",
     "eslint-loader": "1.3.0",
     "ghooks": "1.2.1",
+    "istanbul": "0.4.3",
     "karma": "0.13.22",
     "karma-chai": "0.1.0",
     "karma-chrome-launcher": "1.0.1",
@@ -41,8 +42,9 @@
   },
   "scripts": {
     "test": "karma start",
+    "check-coverage": "istanbul check-coverage --statements 23 --branches 5 --functions 9 --lines 24",
     "watch:test": "npm test -- --auto-watch --no-single-run",
-    "validate": "npm-run-all --parallel validate-webpack:* lint test",
+    "validate": "npm-run-all --parallel validate-webpack:* lint test --serial check-coverage",
     "validate-webpack:dev": "webpack-validator webpack.config.js --env.dev",
     "validate-webpack:prod": "webpack-validator webpack.config.js --env.prod",
     "clean-dist": "rimraf dist",