Code coverage using Istanbul for Ember apps.
- 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 (even as a dependency of Mirage) you need
pretender >= 0.11.0
- If using Mirage or Pretender, you need to set up a passthrough for coverage to be written.
ember install ember-cli-code-coverage
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
If you want your coverage to work on both Unix and Windows, you can do this:
npm install cross-env --save-dev
and then:
cross-env COVERAGE=true ember test
Configuration is optional. It should be put in a file at config/coverage.js
.
-
coverageEnvVar
: Defaults toCOVERAGE
. This is the environment variable that when set will cause coverage metrics to be generated. -
reporters
: Defaults to['lcov', 'html']
. Thejson-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 tocoverage
. A folder relative to the root of your project to store coverage results. -
useBabelInstrumenter
: Defaults tofalse
. 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 inember-cli-build.js
.
module.exports = {
coverageEnvVar: 'COV'
}
(When using ember-cli-mirage or Pretender.)
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.
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.