autof

Compile and run Angular tests affected by git changes.

What it does

Using this module will make your npm test compile and execute only the tests affected by your git changes. If you have pending changes on a spec file, that file and its dependencies will be compiled. If you have pending changes on a component, its associated spec file will be compiled too.

If there are no pending changes then all tests are run.

Why the name 'autof'

It's kind of like automatically using fdescribe on the tests relevant to your changes, but better because other test files aren't compiled.

How to use it

npm i -D autof

On your karma.config.js file import autof and call it with the configuration:

const autof = require("autof");

module.exports = function (config) {

  autof(config); // That's it.

  config.set({
    // ...
  });
};

Now you can run npm test and only the files relevant to your changes will be compiled.

Configuration

The autof function receives two parameters, the karma configuration and an options object. The options object isn't necessary if using the Angular CLI.

autof(config, options);

Options default values:

autof(config, {
  limit: 50, // How many files can be modified before giving up and run all tests
  disabled: false, // Turn off autof
  silent: false, // Don't display to the console
  sourceRoot: "src", // Root folder of your application
  testFile: path.resolve(__dirname, "src/test.ts"), // Starting point for building the test bundle
  loader: path.resolve(__dirname, "node_modules/@ngtools/webpack/src/ivy/index.js"), // Webpack loader for the test file
  webpackConfig: config.buildWebpack.webpackConfig // Webpack configuration to use
});

Running all tests

The option disabled is there so you can configure your environment to run all tests even when there are pending changes in git. To do it you can check for a parameter (process.argv) or with an environment variable (process.env). For example if you decide to go with a parameter called --all you could do the following:

const autof = require("autof");
const runAllTests = process.argv.indexOf("--all") >= 0;

module.exports = function (config) {

  autof(config, {
    disabled: runAllTests
  });

  config.set({
    // ...
  });
};

SimonTest

If you like this tool then check out SimonTest. It takes care of the most tedious part of testing components and services: stubbing dependencies. This extension analyzes your code and creates the necessary stubs, configures the TestBed, and it even generates basic tests.