Generalize expect of QueryTest#test_name_with_descriptions
Generalize expect of QueryTest#test_name_with_descriptions

Expectation was a hard-coded list of `Name.id`s. This breaks if more NameDescription fixtures are added.
Therefore, instead of hard-coding, derive the expectation from an ActiveRecord query:  have the db return Descriptions with unique Names, sorted by name_id, with Rails plucking the id.

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