There are two ways to test web applications:
- In-browsers: You get a more realistic test, but you need some more complex infrastructure and the test usually take longer. You can test DOM access.
- with node.js: You cannot test DOM access, but testing is usually faster.
In-browser testing
mocha-loader
The mocha-loader executes your code with the mocha framework. If you run the code it?ll show the results in the web page.
Hint: when using !
in the bash command line, you must escape it by prepending a \
webpack 'mocha!./test.js' testBundle.js # index.html is a HTML page which loads testBundle.js open index.html
webpack-dev-server
The webpack-dev-server will automatically create a HTML page which loads the script. It also re-executes the tests when files have changed.
webpack-dev-server 'mocha!./test.js' --hot --inline --output-filename test.js open http://localhost:8080/test
Hint: Use --hot
and it?ll only execute tests which have changed or have changed dependencies.
karma and webpack
You can use webpack with karma. Add "webpack"
as preprocessor to your karma config.
node.js testing
CommonJs only
If you write your web app only in CommonJs and don?t use loaders or other webpack-specific features, you can test it in node.js. Just use a node.js testing framework, i. e. mocha.
mocha test/*
Compile and test
If you use webpack-specific features it may not possible to run the code with node.js. webpack allows to configure a target system: i. e. you can compile code so that it can run in node.js (configuration option target: "node"
). Then use a node.js testing framework to run the bundle.
webpack test.js /tmp/testBundle.js --target node mocha /tmp/testBundle.js
Hint: You can use the
null-loader
for stylesheets instead of thestyle-loader!css-loader
.style-loader
doesn?t work in node.js as it requires a DOM.
To make debugging tests easier, you can add source map support using node-source-map-support:
webpack test.js /tmp/testBundle.js --target node mocha --require source-map-support/register /tmp/testBundle.js
Make sure to configure the devtool
option to output the source map.
enhanced-require
TODO
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