NXCALS-742 - SubscriptionAssignmentTest is failing sometimes

Merged Marcin Sobieszek requested to merge feature-NXCALS-742 into develop

@jwozniak please review; I suspect the reason for failing tests lies in the randomness of the number of test objects (subscriptions) used:

{code:java} int subsCount = (ThreadLocalRandom.current().nextInt(100) + 1) * 2; {code}

When subsCount was set to 0 the relevant test always failed.

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