lucene/gradle/testing/slowest-tests-at-end.gradle

// Add test duration summary at the end of the build.

def allTests = []

allprojects {
  tasks.withType(Test) { task ->
    afterTest { desc, result ->
      def duration = (result.getEndTime() - result.getStartTime())

      allTests << [
        name    : "${desc.className.replaceAll('.+\\.', "")}.${desc.name} (${project.path})",
        duration: duration
      ]
    }
  }
}

gradle.buildFinished { result ->
  if (allTests && result.getFailure() == null) {
    def slowest = allTests
      .sort { a, b -> b.duration.compareTo(a.duration) }
      .take(10)
      .findAll { e -> e.duration >= 500 }
      .collect { e -> String.format(Locale.ROOT, "%5.2fs %s", e.duration / 1000d, e.name) }

    if (slowest) {
      logger.lifecycle("The slowest tests (exceeding 500 ms) during this run:\n  " +
        slowest.join("\n  "))
    }
  }
}