estDataObjectsCreatedOncePerFile:

      junit.framework.AssertionFailedError: After getting folder node children, a data object is not started to be created >1 time expected:<1> but was:<2>
	at junit.framework.Assert.fail(Assert.java:47)
	at junit.framework.Assert.failNotEquals(Assert.java:282)
	at junit.framework.Assert.assertEquals(Assert.java:64)
	at junit.framework.Assert.assertEquals(Assert.java:201)
	at org.openide.loaders.DataObjectInvalidationTest.testDataObjectsCreatedOncePerFile(DataObjectInvalidationTest.java:209)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at junit.framework.TestCase.runTest(TestCase.java:154)
	at junit.framework.TestCase.runBare(TestCase.java:127)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:118)
	at org.netbeans.junit.NbTestCase.run(NbTestCase.java:85)
	at junit.framework.TestSuite.runTest(TestSuite.java:208)
	at junit.framework.TestSuite.run(TestSuite.java:203)
	at org.netbeans.xtest.testrunner.JUnitTestRunner.runTests(JUnitTestRunner.java:166)
	at org.netbeans.xtest.testrunner.JUnitTestRunner.runTests(JUnitTestRunner.java:122)
	at org.netbeans.xtest.testrunner.JUnitTestRunner.main(JUnitTestRunner.java:226)