Simplify test readers and writers #3865
Merged
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For #3811.
Merge test reader and writer interfaces.
For non-test code we will continue to need the separate reader and writer interfaces, but after this refactoring arc is complete they should be backed by one implementing class.
The test readers and writers are already backed by one implementation, and from the point of view of tests it's simpler to be clear that that's exactly the class being used everywhere.