Add support for Jacoco codecoverage

• Type: Story
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.0.0 DXP FP24, 7.0.0 DXP FP26, 7.0.X EE, 7.0.4 CE GA5, Master
• Component/s: Testing > CI environments
• Labels:
  • liferay-digital-enterprise-70-sp5
  • liferay-fixpack-de-24-7010
  • liferay-fixpack-de-26-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Priority Level: Low
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/50462

For developers local code coverage usage:

For unit test(including portal unit, module unit and portal-impl integration), just add -Djunit.code.coverage=true to your test command.

For module integration(aka Arquillian test), there are 2 ways.
a) If you want to start tomcat manually, start it this way: "./catalina.sh jacoco run", then you can just run tests as you normally do
b) If you want gradle to start the tomcat for you, run the test this way :
gw testIntegration --tests YourTest -Dapp.server.start.executable.arg.line="jacoco run"

Once your finish all your tests, shutdown your application server if it is running to dump the test data, to generate the report, run "ant generate-code-coverage-report" from project root. The report will be dumped at ${project.dir}/jacoco/html-report.