Add tests for name and short_name, refactor property testing
Add tests for name and short_name, refactor property testing

Properties for a known BIC are tested in test_bic_properties(), this
additionally introduces test_unknown_bic_properties() to test with a
BIC not in bank-registry.json . This lets us drop
test_country_bank_code() , as the assertions made there are replicated
in test_bic_properties() or test_unknown_bic_properties() .

Tests for the BIC properties name and short_name are also added to the
aforementioned functions in this commit.

figo-connect/schwifty