Java test coverage
SonarQube supports the reporting of test coverage as part of the analysis of your Java project.
However, SonarQube does not generate the coverage report itself. Instead, you must set up a third-party tool to produce the report as part of your build process. You then need to configure your analysis to tell the SonarScanner where the report is located so that it can pick it up and send it to SonarQube, where it will be displayed on your project dashboard along with the other analysis metrics.
For Java projects, SonarQube directly supports the JaCoCo coverage tool (see Generic Test Data for information on integrating other coverage tools).
Adjust your setup
To enable coverage, you need to:
- Adjust your build process so that JaCoCo report generation step runs before the SonarScanner step.
- Make sure that JacCoCo writes its report file to a defined path in the build environment.
- Configure the scanning step of your build so that the SonarScanner picks up the report file from that defined path.
Add coverage in a single-module Maven project
To add coverage to your Maven project you need to use the
jacoco-maven-plugin and its
report goal to create a code coverage report.
Typically, you would create a specific Maven profile for executing the unit tests with instrumentation and producing the coverage report only on demand.
In the most basic case, we will need to execute two goals:
jacoco:prepare-agent, which allows coverage info to be collected during unit tests execution, and
jacoco:report, which uses data collected during unit test execution to generate a report. By default, the tool generates XML, HTML, and CSV versions of the report. Here, we explicitly specify XML, since that is the only one we need for SonarQube. The
<profile> section of your
pom.xml should look something like this:
By default, the generated report will be saved under
target/site/jacoco/jacoco.xml. This location will be checked automatically by the scanner, so no further configuration is required. Just launch:
as usual and the report will be picked up.
If you need to change the directory where the report is generated, you can set the property either on the command line using Maven’s
or in your
Wildcards and a comma-delimited list of paths are supported. See coverage analysis parameters for details. The path can be either absolute or relative to the project root.
Add coverage in a multi-module Maven project
For multi-module Maven projects, you configure the
jacoco-maven-plugin in a profile in the parent pom just as in the single module case, above. By default, a separate coverage report will be generated for each module.
If you want to aggregate all the module-specific reports into one project-level report, the easiest solution is to create a special Maven module (alongside the ones you already have), that contains nothing except a
pom.xml that uses the
report-aggregate goal. Here is an example:
When you invoke
maven clean verify in the
report-aggregate-module directory the aggregated report will be generated and placed inside that directory at the standard location
target/site/jacoco-aggregate/jacoco.xml. Then, in the top level
pom.xml you set
sonar.coverage.jacoco.xmlReportPaths to this location:
Wildcards and a comma-delimited list of paths are supported. See test coverage parameters for details.
Add coverage in a Gradle project
To set up code coverage for your Gradle files, you just need to apply the JaCoCo plugin together with the SonarScanner for Gradle to the
build.gradle file of your project as the JaCoCo is already integrated into the default gradle distribution:
Your report will be automatically saved in the
build/reports/jacoco directory. The SonarQube plugin automatically detects this location so no further configuration is required. To import coverage, launch:
For more details, see the Gradle JaCoCo Plugin documentation and
Coverage parameter can also be set in the UI
sonar.coverage.jacoco.xmlReportPaths parameter can also be set in the SonarQube interface under
Your Project > Project Settings > General Settings > JaCoCo
for project-level settings, and
Administration > Configuration > General Settings > JaCoCo
for global settings (applying to all projects).
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