<target name="deployChrisDevCodeSpecify" >
     <script language="javascript"><![CDATA[
            var deployTask = project.createTask('antlib:com.salesforce:deploy');
            deployTask.setUsername(project.getProperty("sf.username"));
            deployTask.setPassword(project.getProperty("sf.password"));
            deployTask.setServerURL(project.getProperty("sf.serverurl"));
            deployTask.setDeployRoot(project.getProperty("dir"));
            deployTask.setTestLevel("RunSpecifiedTests");
            deployTask.setMaxPoll("300");
            var tests = "${tests}" ;
            if (tests) {
              deployTask.setTestLevel('RunSpecifiedTests');
              tests = tests.split(',');
              for (var i = 0; i < tests.length; i++) {
                var runTest = java.lang.Class.forName(
                  "com.salesforce.ant.DeployTask$CodeNameElement"
                ).newInstance();
                runTest.addText(tests[i]);
                deployTask.addRunTest(runTest);
              }
            }
            deployTask.perform();
          ]]></script>
</target>