ProcessInstantiationAtActivitiesHistoryTest is unstable

Acceptance Criteria (Required on creation):

• ProcessInstantiationAtActivitiesHistoryTest#testSkipCustomListenerEnsureHistoryWritten in the unit test suite is not flaky

Hints (Optional):

• Failed in 7.14 assembly with the following output:

  Fehlermeldung
  
  expected:<19306> but was:<null>
  
  Stacktrace
  
  java.lang.AssertionError: expected:<19306> but was:<null>
  	at org.junit.Assert.fail(Assert.java:88)
  	at org.junit.Assert.failNotEquals(Assert.java:834)
  	at org.junit.Assert.assertEquals(Assert.java:118)
  	at org.junit.Assert.assertEquals(Assert.java:144)
  	at org.camunda.bpm.engine.test.api.runtime.ProcessInstantiationAtActivitiesHistoryTest.testSkipCustomListenerEnsureHistoryWritten(ProcessInstantiationAtActivitiesHistoryTest.java:288)
  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  	at java.lang.reflect.Method.invoke(Method.java:498)
  	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
  	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
  	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
  	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
  	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
  	at org.camunda.bpm.engine.test.ProcessEngineRule$1.evaluate(ProcessEngineRule.java:173)
  	at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
  	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
  	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
  	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
  	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
  	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
  	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
  	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
  	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
  	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
  	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
  
  Standard Ausgabe (STDOUT)
  
  11:52:49.592 [main] DEBUG org.camunda.bpm.engine.test - annotation @Deployment creates deployment for ProcessInstantiationAtActivitiesHistoryTest.testSkipCustomListenerEnsureHistoryWritten
  11:52:49.612 [main] DEBUG org.camunda.bpm.engine.test - annotation @Deployment deletes deployment for ProcessInstantiationAtActivitiesHistoryTest.testSkipCustomListenerEnsureHistoryWritten
  11:52:49.623 [main] DEBUG org.camunda.bpm.engine.test - verifying that db is clean after test
  11:52:49.626 [main] DEBUG org.camunda.bpm.engine.test - Deployment cache was clean.
  11:52:49.626 [main] DEBUG org.camunda.bpm.engine.test - Database was clean.