[REFACTOR] Group all unit tests that simply check if properties are "gettable"

[BeatsuDev]

Which part to refactor

Group all tests that check for hardcoded values in the demo account to a single test.

Why this should be refactored

Most of the tests now don't really test any difficult logic. Even if all these tests that simply check if a property is "gettable" it would be very easy to locate the problem if the test fails because there is basically no logic in them.

What breaking changes does this have for the end-user

None