Fix backend test classes so they actually run #2479
Merged
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We accidentally stopped running many backend tests when we merged #2467,
because they no longer inherited from untitest.TestCase and didn't have a
name starting with "Test".
This PR renames the tests so they actually run. I also fixed a bug with the
pseudonetcdf backend that appears to have been introduced by a bad merge in
#2261. It wasn't caught because the tests weren't actually running.
cc @max-sixty