def test_alignment(self):
"""Test field formats that are valid ElementString elements."""
TestStruct = Message("TestStruct", [("a", "c"), ("b", "2c")]) # single character # 2 char string
test_data = {"a": "a", "b": "no"}
TestStruct.update(alignment=4)
packed = TestStruct.pack(test_data)
assert packed == b"a\x00\x00\x00no\x00\x00"
