Land actually can be exempt on a non-exempt parcel e.g. you can have a EX land code on a 211 pardat parcel. However, the reverse is not true (can't have an EX pardat parcel and a 200 land class).
Add one or more tests to confirm that parcels that are exempt in pardat are also exempt in all of the other tables that have class columns.
From discussion on #323:
Add one or more tests to confirm that parcels that are exempt in
pardat
are also exempt in all of the other tables that haveclass
columns.