diff --git a/karma.conf.babel.js b/karma.conf.babel.js
index e66ee85..2207ed0 100644
--- a/karma.conf.babel.js
+++ b/karma.conf.babel.js
@@ -9,10 +9,13 @@ export default (config) => {
     reporters: ['mocha', 'coverage'],
     files: ['test/index.js'],
     preprocessors: {
-      'test/index.js': ['webpack']
+      'test/index.js': ['webpack', 'sourcemap']
     },
     coverageReporter: {
-      type: 'lcov',
+      reporters: [
+        { type: 'lcov' },
+        { type: 'text' }
+      ],
       includeAllSources: true,
       dir: 'coverage',
       subdir: '.'
@@ -22,7 +25,8 @@ export default (config) => {
       noInfo: true
     },
     mochaReporter: {
-      showDiff: true
+      showDiff: true,
+      output: 'full'
     },
     singleRun: true
   })
diff --git a/package.json b/package.json
index f1a5241..6dc1ec1 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
     "karma-mocha": "^1.2.0",
     "karma-mocha-reporter": "^2.2.0",
     "karma-phantomjs-launcher": "^1.0.2",
+    "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^1.8.0",
     "mocha": "^3.1.2",
     "phantomjs-prebuilt": "^2.1.13",
diff --git a/test/index.js b/test/index.js
index ccb5aef..fb227d8 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,2 +1,4 @@
 const testsContext = require.context('.', true, /\.spec$/)
+const srcContext = require.context('../src', true, /\.js$/)
 testsContext.keys().forEach(testsContext)
+srcContext.keys().forEach(srcContext)
diff --git a/yarn.lock b/yarn.lock
index 5544a5f..8e48d48 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3007,6 +3007,12 @@ karma-phantomjs-launcher@^1.0.2:
     lodash "^4.0.1"
     phantomjs-prebuilt "^2.1.7"
 
+karma-sourcemap-loader:
+  version "0.3.7"
+  resolved "https://registry.yarnpkg.com/karma-sourcemap-loader/-/karma-sourcemap-loader-0.3.7.tgz#91322c77f8f13d46fed062b042e1009d4c4505d8"
+  dependencies:
+    graceful-fs "^4.1.2"
+
 karma-webpack@^1.8.0:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/karma-webpack/-/karma-webpack-1.8.0.tgz#340c7999eb3745b47becab47d0d304dac2c55257"