Simplify tests for RowConvertible fetch requests
Simplify tests for RowConvertible fetch requests

groue/GRDB.swift,zmeyc/GRDB.swift,zmeyc/GRDB.swift,zmeyc/GRDB.swift,groue/GRDB.swift,groue/GRDB.swift,zmeyc/GRDB.swift,groue/GRDB.swift