Now that we have Gradle as our build system we have a whole range of plugins we can use directly in Gradle. For code coverage I am using the JaCoCo plugin. To use it with Grails we just apply the plugin to the build. By default you will get a HTML report, in the build/report/jacoco directory.

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apply plugin: "jacoco"

But Grails 3 has it’s test phases split up, out of the box you will have test and integrationTest. Starting with the JaCoCo gradle plugin, you will get coverage for just your test phase.

We can easily fix this by letting JaCoCo know about the phases we want reported on so we just adjust the config for the jacocoTestReport task.

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jacocoTestReport {
  executionData integrationTest, test
  //...
}

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