def test_multiset_change(counter_type):
ent1 = FeatureCollection()
ent1['bow'] += counter_type(Counter(['big', 'dog']))
ent1.pop('bow')
assert dict(ent1.items()) == dict()
## can pop empty -- fails
#ent1.pop('foo')
## set equal to
test_data = ['big2', 'dog2']
ent1['bow'] = counter_type(Counter(test_data))
assert list(map(abs,ent1['bow'].values())) == [1,1]
ent1['bow'] += counter_type(Counter(test_data))
assert list(map(abs,ent1['bow'].values())) == [2,2]
def test_read_only():
fcwork = FeatureCollection({'feat': {'foo': 1}})
fc = FeatureCollection()
fc['feat']['foo'] += 1
fc.read_only = True
with pytest.raises(ReadOnlyException):
fc += fcwork
with pytest.raises(ReadOnlyException):
fc -= fcwork
with pytest.raises(ReadOnlyException):
fc -= fcwork
with pytest.raises(ReadOnlyException):
del fc['feat']
with pytest.raises(ReadOnlyException):
fc.pop('feat')
