ntest fails for dependency-aware batch systems

Job submission fails when ntest > 0 on a batch system which is dependency-aware. The test case test_dep_ntest fails

test_dep_ntest (test_submission_controller.DependencyTest) ... Submitting task 'mock task 1'
[WARNING] Some dependency tasks of task 'mock task 2' are in an unexpected state, they should be running, submitted or done (is state: 'tosubmit').
ERROR

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ERROR: test_dep_ntest (test_submission_controller.DependencyTest)
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Traceback (most recent call last):
  File "test_submission_controller.py", line 2245, in test_dep_ntest
    controller.submitTasks(args, [task4])
  File "/home/fs85/ratlas/CAFCore_Sub/RootCoreBin/python/CommonAnalysisHelpers/submissionControllerBase.py", line 594, in submitTasks
    raise RuntimeError("Submission failed for task '{:s}' or one of its dependencies".format(t.identifier))
RuntimeError: Submission failed for task 'mock task 4' or one of its dependencies

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See Job #1346537