Mocked domain class do not provide findWhere results

When using inside my unit test something like for setting up my mock domain instances:

persons = [ new Person(name:'Graeme'), ... ]
mockDomain(Person, persons)

and then in my service class for example, I am using findWhere lookup

Person.findWhere(name: 'Graeme')

it does not return any results, although the persons list does contain a proper object.

Workaround is in this case to use a findByName dynamic finder.