Feature: MergeManyChangeSets for Cache ChangeSets with List ChangeSets

[dwcullop]

Description

Implements the MergeManyChangeSets operator for Cache ChangeSets source and List ChangeSet children. This PR also adds an IEqualityComparer to the List-to-List version that was omitted before.

Other Changes

• Rename MergeManyCacheChangeSetsSourceCompareFixture to MergeManyChangeSetsCacheSourceCompareFixture for consistency
• Rename Completed to IsCompleted property on Cache Aggregator for consistency
• Created a Stress Test helper extension methods and test helper code

[RolandPheasant]

Code wise, it looks great and only one minor request which is to seal classes when possible.

Aside from that I ran the stress tests and managed to produce some intermittent errors.

and on a subsequent run

I think the stress tests are a brilliant idea, but I wonder whether that test performance wizard @JakenVeina has any suggestions how those tests can be made to run fast,

[JakenVeina]

I think the stress tests are a brilliant idea, but I wonder whether that test performance wizard @JakenVeina has any suggestions how those tests can be made to run fast,

Would be happy to, if the branch would build. ;)

[ChrisPulman]

The problem now is that the Stress tests take an infinite period of time to run.

[ChrisPulman]

I think the stress tests are a brilliant idea, but I wonder whether that test performance wizard @JakenVeina has any suggestions how those tests can be made to run fast,

Would be happy to, if the branch would build. ;)

@JakenVeina The branch should build now, if you have time

[dwcullop]

Code wise, it looks great and only one minor request which is to seal classes when possible.

Agree about sealing the classes, but I can't find any that weren't already sealed (or static).

Aside from that I ran the stress tests and managed to produce some intermittent errors.

Been fighting these for a few days now, but I hope I've got them under control now.

I think the stress tests are a brilliant idea, but I wonder whether that test performance wizard @JakenVeina has any suggestions how those tests can be made to run fast,

I'm open to any suggestions.

[RolandPheasant]

I have not followed the entire conversation on Slack, owning to being away for a couple days. Instead for now I'll approve and leave to the discretion of @dwcullop whether it is ready to be merged.

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