Code coverage reports - Amazon CodeBuild
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Code coverage reports

CodeBuild allows you to generate code coverage reports for your tests. The following code coverage reports are provided:

Line coverage

Line coverage measures how many statements your tests cover. A statement is a single instruction, not including comments or conditionals.

line coverage = (total lines covered)/(total number of lines)

Branch coverage

Branch coverage measures how many branches your tests cover out of every possible branch of a control structure, such as an if or case statement.

branch coverage = (total branches covered)/(total number of branches)

The following code coverage report file formats are supported:

  • JaCoCo XML

  • SimpleCov JSON¹

  • Clover XML

  • Cobertura XML


¹ CodeBuild accepts JSON code coverage reports generated by simplecov, not simplecov-json.

Create a code coverage report

To create a code coverage report, you run a build project that is configured with at least one code coverage report group in its buildspec file. CodeBuild will interpret the code coverage results and provide a code coverage report for the run. A new test report is generated for each subsequent build that uses the same buildspec file.

To create a test report
  1. Create a build project. For information, see Create a build project in Amazon CodeBuild.

  2. Configure the buildspec file of your project with test report information:

    1. Add a reports: section and specify the name for your report group. CodeBuild creates a report group for you using your project name and the name you specified in the format project-name-report-group-name-in-buildspec. If you already have a report group you want to use, specify its ARN. If you use the name instead of the ARN, CodeBuild creates a new report group. For more information, see Reports syntax in the buildspec file.

    2. Under the report group, specify the location of the files that contain the code coverage results. If you use more than one report group, specify result file locations for each report group. A new code coverage report is created each time your build project runs. For more information, see Specify test files.

      This is an example that generates a code coverage report for a JaCoCo XML results file located in test-results/jacoco-coverage-report.xml.

      reports: jacoco-report: files: - 'test-results/jacoco-coverage-report.xml' file-format: 'JACOCOXML'
    3. In the commands section of the build or post_build sequence, specify the commands that run the code coverage analysis. For more information, see Specify test commands .

  3. Run a build of the build project. For more information, see Run a build in Amazon CodeBuild.

  4. When the build is complete, choose the new build run from Build history on your project page. Choose Reports to view the code coverage report. For more information, see View test reports for a build.