def test_returned_data_should_be_immutable(self):
stub_document = {"_count": 0}
data = GroupedData(stub_document)
another_data = data.data()
try:
another_data.append({"even_more_nonsense": True})
assert_that(False, "expected an exception")
except AttributeError as e:
assert_that(str(e), "'tuple' object has no attribute append")
def test_adding_documents(self):
stub_document = {"_count": 0}
data = GroupedData(stub_document)
assert_that(data.data(), has_length(1))