def test_should_raise_error_when_all_items_in_tuple_are_not_integers(self):
field = BitsField(
parts=[FieldPart('version', 4, 4),
FieldPart('IHL', 5, 4)],
format='B')
with pytest.raises(ValueError) as exc_info:
field.value = (2, 3.4)
assert 'all items in tuple must be integers' == str(exc_info.value)
def test_should_raise_error_when_tuple_is_empty(self):
field = BitsField(
parts=[FieldPart('version', 4, 4),
FieldPart('IHL', 5, 4)],
format='B')
with pytest.raises(ValueError) as exc_info:
field.value = ()
assert 'value must not be an empty tuple' == str(exc_info.value)
def test_should_raise_error_when_tuple_length_is_different_field_parts_length(
self):
field = BitsField(
parts=[FieldPart('version', 4, 4),
FieldPart('IHL', 5, 4)],
format='B')
with pytest.raises(ValueError) as exc_info:
field.value = (2, 3, 4)
assert 'tuple length is different from field parts length' == str(
exc_info.value)
def test_should_raise_error_when_value_is_not_integer_or_tuple(
self, value):
field = BitsField(
parts=[FieldPart('version', 4, 4),
FieldPart('IHL', 5, 4)],
format='B')
with pytest.raises(TypeError) as exc_info:
field.value = value
assert 'value must be an integer or a tuple of integers' == str(
exc_info.value)
def test_should_raise_error_when_int_value_is_not_in_valid_boundaries(
self, size, format_, value_1, value_2):
field = BitsField(
parts=[FieldPart('version', 4, size),
FieldPart('IHL', 5, size)],
format=format_)
for value in [value_1, value_2]:
with pytest.raises(ValueError) as exc_info:
field.value = value
assert f'integer value must be between 0 and {value_2 - 1}' == str(
exc_info.value)
def test_should_raise_error_when_items_dont_have_a_correct_value(
self, size, format_, value_1, value_2):
field = BitsField(
parts=[FieldPart('version', 4, size),
FieldPart('IHL', 5, size)],
format=format_)
for value in [value_1, value_2]:
with pytest.raises(ValueError) as exc_info:
field.value = (value, 4)
message = f'item version must be between 0 and {2 ** size - 1} according to the field part size'
assert message == str(exc_info.value)
def test_should_not_raise_error_when_setting_a_correct_tuple_value(
self, size, format_):
field = BitsField(
parts=[FieldPart('version', 4, size),
FieldPart('IHL', 5, size)],
format=format_)
value = (5, 6)
try:
field.value = value
except ValueError:
pytest.fail(f'unexpected error when setting value with {value}')
assert value == field.value_as_tuple