Add tests for cache adapter (#596)

* Add tests for cache adapter

* Apply suggestions from code review

Co-authored-by: conico974 <nicodorseuil@yahoo.fr>

* Group incremental cache disabled tests together

* Assert incrementalCache.set parameters

* Assert return value for incremental cache redirect

* Remove invalid next test cases

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Co-authored-by: conico974 <nicodorseuil@yahoo.fr>

Author: socsieng