ember-cli-code-coverage

Code coverage using Istanbul for Ember apps.

Requirements

If using Mocha, Testem >= 1.6.0 for which you need ember-cli > 2.4.3
If using Mirage you need ember-cli-mirage >= 0.1.13
If using Pretender you need pretender >= 0.11.0

Installation

ember install ember-cli-code-coverage

Usage

Coverage will only be generated when an environment variable is true (by default COVERAGE) and running your test command like normal.

For example:

COVERAGE=true ember test

Configuration

Configuration is optional. It should be put in a file at config/coverage.js.

Options

coverageEnvVar: Defaults to COVERAGE. This is the environment variable that when set will cause coverage metrics to be generated.
reporters: Defaults to ['lcov', 'html']. The json-summary reporter will be added to anything set here, it is required. This can be any reporters supported by Istanbul.
excludes: Defaults to ['*/mirage/**/*']. An array of globs to exclude from instrumentation. Useful to exclude files from coverage statistics.
coverageFolder: Defaults to coverage. A folder relative to the root of your project to store coverage results.
useBabelInstrumenter: Defaults to false. Whether or not to use Babel instrumenter instead of default instrumenter. The Babel instrumenter is useful when you are using features of ESNext as it uses your Babel configuration defined in ember-cli-build.js.

Using when intercepting all ajax requests in tests

Aka when using ember-cli-mirage or Pretender. You may require a version of Pretender that includes this fix.

To work, this addon has to post coverage results back to a middleware at /write-coverage.

// in mirage/config.js

  this.passthrough('/write-coverage');
  this.namespace = 'api';  // It's important that the passthrough for coverage is before the namespace, otherwise it will be prefixed.

Inspiration

This addon was inspired by ember-cli-blanket. The primary differences are that this addon uses Istanbul rather than Blanket for coverage and it instruments your application code as part of the build, when enabled.

wagenet / ember-cli-code-coverage