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#!/usr/bin/env python3 |
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"""Tests for the starstruct class and its self packing""" |
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import struct |
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import unittest |
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from starstruct.message import Message |
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class TestStarStruct(unittest.TestCase): |
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"""Test class for self packing of messages""" |
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teststruct = [ |
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('a', 'b'), # signed byte: -128, 127 |
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('pad1', '3x'), # 3 pad bytes |
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('b', 'H'), # unsigned short: 0, 65535 |
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('pad2', 'x'), # 1 pad byte |
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] |
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testvalues = [ |
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{ |
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'a': -128, |
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'b': 0, |
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}, |
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{ |
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'a': 127, |
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'b': 65535, |
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}, |
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] |
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VarTest = Message('VarTest', [ |
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('x', 'B'), |
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('y', 'B'), |
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]) |
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Repeated = Message('Repeated', [ |
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('x', 'B'), |
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('z', 'H'), |
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]) |
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def test_self_pack(self): |
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my_message = Message('MyMessage', self.teststruct) |
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my_instance_1 = my_message.make(self.testvalues[0]) |
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my_instance_2 = my_message.make(self.testvalues[1]) |
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my_bytes_1 = my_message.pack(self.testvalues[0]) |
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my_bytes_2 = my_message.pack(self.testvalues[1]) |
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assert my_instance_1.pack() == my_bytes_1 |
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assert my_instance_2.pack() == my_bytes_2 |
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def test_no_data(self): |
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num_repeats = 4 |
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TestStruct = Message('TestStruct', [ |
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('length', 'H', 'vardata'), |
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('vardata', self.VarTest, 'length'), |
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('repeated_data', self.Repeated, num_repeats), |
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]) |
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test_data_no_data = { |
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'length': 0, |
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'vardata': [], |
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'repeated_data': [ |
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], |
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} |
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made = TestStruct.make(test_data_no_data) |
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assert made.length == 0 |
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assert made.vardata == [] |
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assert made.repeated_data == [] |
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packed = TestStruct.pack(test_data_no_data) |
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assert packed == struct.pack('H', 0) + (struct.pack('B', 0) + struct.pack('H', 0)) * num_repeats |
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assert packed == made.pack() |
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sprout42 /
StarStruct
