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→Ownership and Overlap
Tests can and should overlap between Gaia Integration and Gaia UAT. It is unacceptable process complication for QA to expect developers to always consult their needs and vice versa for every change. If the suites are united, it's all too easy for one group to inadvertently make a change that damages the purpose of the other. For acceptance, in particular, this is too risky.
Avoiding this requires separate tests, even to the point where there might be tests whose code flow is entirely duplicated between the two suites.
While this seemingly violates "single point of truth," the different contexts in which the tests are specified, scoped and maintained actually makes these two different tests, much like two separate applications would never refer to each others' source unless it can be pushed into an independent library. Via skillful reuse of View and other generic code modules between suites, each test can be treated as an independent target without increasing maintenance unacceptably.
Of course, each group should have an opinion on coverage for either suite, and can (and should) help expand each suite, but single point of ownership allows decisions to be made quickly as appropriate for each set of primary stakeholders.
