Use factory_bot to create records in the test suite

[ellnix]

Description
FactoryBot would remove a lot of the hassle of maintaining ActiveRecord objects used in various tests.

Other
Most of the time when testing we do not care about the particular values of a record's attributes, rather we want to make assertions around its presence and logic. FactoryBot would abstract the creation of valid record objects which would make the test suite easier to maintain.