JaCoCo

Java Code Coverage (JaCoCo) is a well-known tool for measuring test coverage.
To use it in our project, we need to add a few lines to our Gradle configuration file, that is, build.gradle:

1. Add the Gradle plugin for JaCoCo:

apply plugin: 'jacoco'

1. To see the JaCoCo results, run the following from your command prompt:

gradle test jacocoTestReport

1. The same Gradle tasks can be run from the Gradle Tasks IDEA Tool Window.
2. The end result is stored in the build/reports/jacoco/test/html directory. It's an HTML file that can be opened in any browser:

Further chapters of this book will explore code coverage in more detail. Until then, go to http://www.eclemma.org/jacoco/ for more information.