def test_cannot_index_non_fields(attr, nonattr):
assume(attr != nonattr)
r = make_record('Rec', [attr])()
with pytest.raises(KeyError):
r[nonattr] = 42
with pytest.raises(KeyError):
r[nonattr]
def test_cannot_delete_fields(attr):
r = make_record('Rec', [attr])()
with pytest.raises(KeyError):
del r[attr]
def test_cannot_update_non_fields(attr, nonattr):
assume(attr != nonattr)
r = make_record('Rec', [attr])()
with pytest.raises(KeyError):
r.update({nonattr: 42})
def test_can_update_fields(attr):
r = make_record('Rec', [attr])()
r.update({attr: 42})
assert r[attr] == 42
def test_can_index_fields(attr):
r = make_record('Rec', [attr])()
r[attr] = 42
assert r[attr] == 42
def test_can_assign_to_field_attributes(attr, value):
r = make_record('Rec', [attr])()
setattr(r, attr, value)
assert getattr(r, attr) == value
def test_cannot_assign_to_non_field_attributes(attr, nonattr):
assume(attr != nonattr)
r = make_record('Rec', [attr])()
with pytest.raises(AttributeError):
setattr(r, nonattr, 'llama')
def test_default_attr_value_is_none(attrs):
r = make_record('Rec', attrs)()
for attr in attrs:
assert getattr(r, attr) is None
assert len(r) == len(attrs)
def test_empty_constructor_has_no_keys():
r = make_record('Rec')()
assert len(r) == 0
def test_empty_constructor_has_no_attributes(attr):
assume(attr not in EXPECTED_RECORD_ATTRIBUTES)
r = make_record('Rec')()
with pytest.raises(AttributeError):
getattr(r, attr)
def test_cannot_construct_from_dict_with_non_fields(attr, nonattr):
assume(attr != nonattr)
R = make_record('Rec', [attr])
with pytest.raises(KeyError):
R({nonattr: 3})
def test_can_construct_from_dict(attrs):
make_record('Rec', attrs)({a: 42 for a in attrs})