Add failed test results to Jenkins build descriptions with Groovy

// Set description of all builds to result of failed tests
def whichJob = "myJob";
def job = hudson.model.Hudson.instance.getItem(whichJob);
def builds = job.getBuilds();
def bldRptStub = "<b>Failed Tests</b><ul>";
builds.each
{
  build ->
    build.setDescription('');
    if (build.testResultAction)
    {
      def bldRpt = bldRptStub;
      def setDescription = false;
      def tra = build.testResultAction;
      def childReports = tra.childReports;
      childReports.each
      {
        rpt ->
          def result = rpt.result;
          if (result.failedTests.size > 0)
          {
            setDescription = true;
          }
          result.failedTests.each
          {
            t ->
              if (t.name != '')
              {
                bldRpt += "<li>" + t.name + "</li>";
              }
          }
      }
      bldRpt += "</ul>";
      if (setDescription)
      {
        build.setDescription(bldRpt);
      }
    }
}