This is an old question, but I thought I'd give my input...
We are still stuck on cake 1.3 and are using Jenkins. We use stagehand-test runner to run the tests and generate the junit report.
You can have your ant build run something like the following:
cakerunner --cakephp-app-path=src/app --log- junit=build/test-results/junit.xml -R src/app/tests
Then in Jenkins you will need to use the 'Publish JUnit test result report' instead of "Publish testing tools result report" where PHPUnit and other frameworks are listed.
I made a similar question not too long ago.
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