Implement a system test for DurableSubscriptions

[Archie-Miller]

Uses the same parameters to validate non Durable vs Durable

Proposed changes

Implement a system unit test to test the functionality of Durable Subscriptions in the Reference Server

Tests add 14 seconds to the Opc.Ua.Client.Tests

Types of changes

What types of changes does your code introduce?
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• Bugfix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which adds functionality)
• [ x ] Test enhancement (non-breaking change to increase test coverage)
• Breaking change (fix or feature that would cause existing functionality to not work as expected, requires version increase of Nuget packages)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [ x ] I have read the CONTRIBUTING doc.
• [ x ] I have signed the CLA.
• [ x ] I ran tests locally with my changes, all passed.
• I fixed all failing tests in the CI pipelines.
• I fixed all introduced issues with CodeQL and LGTM.
• [ x ] I have added tests that prove my fix is effective or that my feature works and increased code coverage.
• I have added necessary documentation (if appropriate).
• Any dependent changes have been merged and published in downstream modules.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.01%. Comparing base (d2b4aa2) to head (e8036aa).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           develop/durable    #2839      +/-   ##
===================================================
+ Coverage            55.97%   56.01%   +0.03%     
===================================================
  Files                  353      353              
  Lines                66248    66248              
  Branches             13582    13582              
===================================================
+ Hits                 37085    37111      +26     
+ Misses               25192    25164      -28     
- Partials              3971     3973       +2     

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[romanett]

Test seems to work good on my machine, however the Test fails on MacOS & Linux:

Linux:

Failed Validate Transfer [9 s]
  Error Message:
     Assert.That(arg1, Is.LessThan(arg2))
  Expected: less than 1500.0d
  But was:  1527.681d

  Stack Trace:
     at NUnit.Framework.Legacy.ClassicAssert.Less(Double arg1, Double arg2)
   at Opc.Ua.Client.Tests.DurableSubscriptionTest.TestSessionTransfer(Boolean setSubscriptionDurable) in /_/Tests/Opc.Ua.Client.Tests/DurableSubscriptionTest.cs:line 461

MacOS:

Failed Validate Transfer [66 ms]
 Error Message:
    Assert.That(anObject, Is.Not.Null)
 Expected: not null
 But was:  null

 Stack Trace:
    at NUnit.Framework.Legacy.ClassicAssert.IsNotNull(Object anObject)
  at Opc.Ua.Client.Tests.DurableSubscriptionTest.GetDesiredNodeIds(UInt32 subscriptionId) in /_/Tests/Opc.Ua.Client.Tests/DurableSubscriptionTest.cs:line 601
  at Opc.Ua.Client.Tests.DurableSubscriptionTest.TestSessionTransfer(Boolean setSubscriptionDurable) in /_/Tests/Opc.Ua.Client.Tests/DurableSubscriptionTest.cs:line 352

[romanett]

@Archie-Miller new CI test failure:

Failed Validate Transfer [85 ms]
Error Message:
Unable to find MonitoredItemCount
Assert.That(anObject, Is.Not.Null)
Expected: not null
But was: null