aggregating gradle multiproject test results using TestReport

Question

I have a project structure that looks like the below. I want to use the TestReport 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?

.
|--ProjectA
  |--src/test/...
  |--build
    |--reports
      |--tests
        |--index.html (testresults)
        |--..
        |--..
|--ProjectB
    |--src/test/...
      |--build
        |--reports
          |--tests
            |--index.html (testresults)
            |--..
            |--..

Answer 1

From Example 4. Creating a unit test report for subprojects in the Gradle User Guide:

subprojects {
    apply plugin: 'java'

    // Disable the test report for the individual test task
    test {
        reports.html.enabled = false
    }
}

task testReport(type: TestReport) {
    destinationDir = file("$buildDir/reports/allTests")
    // Include the results from the `test` task in all subprojects
    reportOn subprojects*.test
}

Fully working sample is available from samples/testing/testReport in the full Gradle distribution.