title: aggregating gradle multiproject test results using TestReport
body: <p>I have a project structure that looks like the below. I want to use the <a href="http://www.gradle.org/docs/current/dsl/org.gradle.api.tasks.testing.TestReport.html">TestReport</a> functionality in Gradle to aggregate all the test results to a single directory.
  Then I can access all the test results through a single index.html file for ALL subprojects.
  How can I accomplish this?</p>
  
  <pre><code>.
  |--ProjectA
    |--src/test/...
    |--build
      |--reports
        |--tests
          |--index.html (testresults)
          |--..
          |--..
  |--ProjectB
      |--src/test/...
        |--build
          |--reports
            |--tests
              |--index.html (testresults)
              |--..
              |--..
  </code></pre>