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62 lines
2.1 KiB
62 lines
2.1 KiB
#!/usr/bin/env python3
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# Copyright 2020 The Pigweed Authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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"""Tests encoding HDLC frames."""
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import unittest
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from pw_hdlc import encode
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from pw_hdlc import protocol
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from pw_hdlc.protocol import frame_check_sequence as _fcs
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FLAG = bytes([protocol.FLAG])
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def _with_fcs(data: bytes) -> bytes:
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return data + _fcs(data)
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class TestEncodeUIFrame(unittest.TestCase):
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"""Tests Encoding bytes with different arguments using a custom serial."""
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def test_empty(self):
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self.assertEqual(encode.ui_frame(0, b''),
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FLAG + _with_fcs(b'\x01\x03') + FLAG)
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self.assertEqual(encode.ui_frame(0x1a, b''),
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FLAG + _with_fcs(b'\x35\x03') + FLAG)
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def test_1byte(self):
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self.assertEqual(encode.ui_frame(0, b'A'),
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FLAG + _with_fcs(b'\x01\x03A') + FLAG)
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def test_multibyte(self):
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self.assertEqual(encode.ui_frame(0, b'123456789'),
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FLAG + _with_fcs(b'\x01\x03123456789') + FLAG)
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def test_multibyte_address(self):
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self.assertEqual(encode.ui_frame(128, b'123456789'),
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FLAG + _with_fcs(b'\x00\x03\x03123456789') + FLAG)
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def test_escape(self):
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self.assertEqual(
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encode.ui_frame(0x3e, b'\x7d'),
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FLAG + b'\x7d\x5d\x03\x7d\x5d' + _fcs(b'\x7d\x03\x7d') + FLAG)
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self.assertEqual(
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encode.ui_frame(0x3e, b'A\x7e\x7dBC'),
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FLAG + b'\x7d\x5d\x03A\x7d\x5e\x7d\x5dBC' +
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_fcs(b'\x7d\x03A\x7e\x7dBC') + FLAG)
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if __name__ == '__main__':
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unittest.main()
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