Generates coverage information of your CSS (or LESS) files using the command line or in browser/GruntJS unit tests.

npm install css-coverage
11 downloads in the last week
13 downloads in the last month

CSS Coverage!

Generates coverage information of your CSS (or LESS) files using the command line or in browser/GruntJS unit tests.

By hooking into BlanketJS you can use this with Jasmine, Mocha, QUnit, Coveralls, and tools like grunt-blanket-mocha.

How is this different from other CSS coverage tools?

Code coverage tools use Unit Tests to "exercise" the code and show you what is not tested; this project hooks into those same tools and gives you CSS coverage information for free!

It also:

  • gives coverage information on your source LESS files, not just the compiled CSS file
  • provides a command line script to run against individual test files or pages hosted on a website

TODO: Coverage currently runs after every test but there will be a function you can call in the middle of a test

Can I see it?

Check out the in-browser mocha demo! (see "blanket.js results" for the CSS coverage)



What can I do with css-coverage?

You can use the command line version to:

  • test a CSS and HTML file one at a time
  • use css-coverage as part of a build (like in GruntJS)
  • generate a LCOV Report for use in services like Coveralls or HTML reports using lcov

Can I make Reports?

You can also generate LCOV Files for Coveralls or just HTML reports:

# Run CSS Coverage and generate a LCOV report (with verbose output)
node ./bin/css-coverage -v -s ./test/test.css -h ./test/test.html -l ./css.lcov

# Optionally Generate an HTML report
genhtml ./css.lcov --output-directory ./coverage

Can I test Coverage of an entire Website?

You can generate CSS coverage of a website by providing a URL instead of a local file in the -h command line argument.

TODO: Write an example using CasperJS

Can I run it with mocha, Jasmine, QUnit?

Yep! It integrates with BlanketJS so you can see LESS/CSS coverage as well as JavaScript coverage.

All you need to do is add the following to your test harness HTML file (usually test/index.html:

  1. include <script src=".../css-polyfills/dist/css-polyfills.js"></script>
  2. include <script src="./src/css-coverage.js"></script> after BlanketJS
  3. include <link rel="stylesheet/coverage" href="path/to/css/file.[less|css]"> to specify which CSS files to cover

See the mocha demo for an example and for the code.

How do I install it?

You can install locally or globally. Installing globally will give you access to css-coverage from the command line.

Locally (on the command line or in conjunction with BlanketJS):

npm install
# Run CSS Coverage on the command line
./bin/css-coverage -s ./test/test.css -h ./test/test.html

Globally (on the command line):

npm install -g .
# Run CSS Coverage
css-coverage -s ./test/test.css -h ./test/test.html

How does this work?

This project uses http://philschatz.com/css-polyfills.js/.

npm loves you