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.

Answer 2

In addition to the subprojects block and testReport task suggested by @peter-niederwieser above, I would add another line to the build below those:

tasks('test').finalizedBy(testReport)

That way if you run gradle test (or even gradle build), the testReport task will run after the subproject tests complete. Note that you have to use tasks('test') rather than just test.finalizedBy(...) because the test task doesn't exist in the root project.