"groups" : [ {
      "testProject" : "nowInAndroidBuild",
      "coverage" : {
        "per_commit" : [ "linux", "windows", "macOs" ]
      }
    }, {
      "testProject" : "santaTrackerAndroidBuild",
      "coverage" : {
        "per_commit" : [ "linux", "windows", "macOs" ]
      }
    } ]
  }, {

Your code needs to run on [all versions of Java that Gradle supports](platforms/documentation/docs/src/docs/userguide/releases/compatibility.adoc) and across all supported operating systems (macOS, Windows, Linux). The [Gradle CI system](http://builds.gradle.org/) will verify this, but here are some pointers that will avoid surprises: