java.lang.IllegalArgumentException: run.single.method
   at org.netbeans.modules.ant.freeform.LookupMergerImpl$ActionProviderImpl.invokeAction(LookupMergerImpl.java:137)
   at org.netbeans.modules.junit.actions.TestMethodAction$1.run(TestMethodAction.java:104)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl$1.run(RunOffEDTImpl.java:151)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1411)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1991)