Code Coverage

In computer science, test coverage is a measure used to describe the degree to which the source code of a program is executed when a particular test suite runs. A program with high test coverage, measured as a percentage, has had more of its source code executed during testing, which suggests it has a lower chance of containing undetected software bugs compared to a program with low test coverage. (Wikipedia)

Automated reports

For pull requests and master pushes we generate code coverage reports on taskcluster and upload them to codecov:

https://codecov.io/gh/mozilla-mobile/android-components

Generating reports locally

Locally you can generate a coverage report for a module with the following command:

./gradlew -Pcoverage <module>:build

After that you’ll find an HTML report at the following location:

components/<path to module>/build/reports/jacoco/jacocoTestReport/html/index.html