Tests retainers view.
- Number of retainers of an A object must be 2 (A itself and B).
- When an object has just one retainer it must be expanded automatically until
there's an object having two or more retainers.
- Test the expansion of a long retainment chain is limited by a certain level.
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Running: testRetainersView
Running: testRetainersAutoExpandSingleRetainer
Running: testRetainersAutoExpandSingleRetainerLimit
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