Unit test VersioningWorkflowTest.testVersioning sometimes randomly fails.

org.junit.ComparisonFailure: expected:<[ab]> but was:<[--]>
at org.junit.Assert.assertEquals(Assert.java:99)
at org.junit.Assert.assertEquals(Assert.java:117)
at org.hippoecm.repository.reviewedactions.VersioningWorkflowTest.testVersioning(VersioningWorkflowTest.java:170)
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:597)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)