Karma + Webpack + Mocha + Chai + Istanbul
Hint: This example still shows a valid approach but getting outdated. Please have a look at https://jestjs.io/ a testing framework including istanbul coverage reporter.
npm install
npm test
Use npm test -- --no-single-run to keep karma running. It will watch any changes on the test files and rerun instantly.
Output
$ npm test
> karma-webpack-example@1.0.0 test /Users/d060690/karma-webpack-example
> node ./node_modules/karma/bin/karma start --single-run --browsers PhantomJS
# ...
03 02 2017 08:31:17.038:INFO [karma]: Karma v1.4.1 server started at http://0.0.0.0:9876/
03 02 2017 08:31:17.044:INFO [launcher]: Launching browser PhantomJS with unlimited concurrency
03 02 2017 08:31:17.067:INFO [launcher]: Starting browser PhantomJS
03 02 2017 08:31:18.045:INFO [PhantomJS 2.1.1 (Mac OS X 0.0.0)]: Connected on socket yME3wmuxdm0t5GHIAAAA with id 92073047
hexColorLuminance
✓ should return a luminanced color
✓ should change the background of an element
PhantomJS 2.1.1 (Mac OS X 0.0.0): Executed 2 of 2 SUCCESS (0.02 secs / 0.002 secs)
TOTAL: 2 SUCCESS
-----------------------|----------|----------|----------|----------|----------------|
File | % Stmts | % Branch | % Funcs | % Lines |Uncovered Lines |
-----------------------|----------|----------|----------|----------|----------------|
Example/ | 83.33 | 50 | 100 | 83.33 | |
hexColorLuminance.js | 83.33 | 50 | 100 | 83.33 | 10,14,17 |
-----------------------|----------|----------|----------|----------|----------------|
All files | 83.33 | 50 | 100 | 83.33 | |
-----------------------|----------|----------|----------|----------|----------------|
=============================== Coverage summary ===============================
Statements : 83.33% ( 15/18 )
Branches : 50% ( 5/10 )
Functions : 100% ( 3/3 )
Lines : 83.33% ( 15/18 )
================================================================================
added usage in a gulp scenario
try it via "npm run test-gulp" or simply "gulp" in the projects directory if you have gulp installed globally