def test_database_events():
A = Alphabet('ACGT')
S = A.parse('AACT', name='S')
# NOTE python 2 does not support non-local, non-global variables, put it in
# the function object.
test_database_events.callback_called = 0
def callback(self, *args):
test_database_events.callback_called += 1
db = DB(':memory:', A)
db.add_event_listener('db-initialized', callback)
db.add_event_listener('sequence-inserted', callback)
db.initialize()
assert test_database_events.callback_called == 1, \
'event callbacks for "initialize" should be executed'
db.insert(S)
assert test_database_events.callback_called == 2, \
'event callbacks for "insert-sequence" should be executed'
