webpack-node-test-runner

Simple CLI that helps run your tests in node after bundling with webpack, and then rerun test files dependent on the files that changed.

setup

• Use require.context to load your test files from a single entry file

• Define your node modules as externals

• Within your entry file, check for the __webpack_ids_to_test__ variable. When using watch, this array will include module ids for the tests that need to be re-run.

  const context = require.context('./', true, /\/__tests__\//)
  if (global.__webpack_ids_to_test__) {
    // only require the necessary components
    global.__webpack_ids_to_test__.forEach(id => __webpack_require__(id))
  } else {
    // require all includes modules
    context.keys().forEach(key => context(key))
  }

run

Once setup use webpack-node-test-runner from the command line:

webpack-node-test-runner --config ./webpack_config/test --watch -- --reporter dot

Use webpack-node-test-runner --help to see all options. Options defined after the -- are sent to mocha, so things like --reporter and --ui should be defined here.

inspiration

This project, especially the feature to only re-run certain tests, was inspired by webpack-mocha. I had intended to add support for devtool: "eval" to that project but found the approach different from what I had in mind, and it was simple enough to re-write.