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86 lines
3 KiB
Python
86 lines
3 KiB
Python
import unittest
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from itertools import islice
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from six.moves import zip
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import pickle
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import mock
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from mock import MagicMock
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from six import BytesIO
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from six import PY2
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import hashlib
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from pysstv import sstv
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from pysstv.sstv import SSTV
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from pysstv.tests.common import get_asset_filename
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class TestSSTV(unittest.TestCase):
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def setUp(self):
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self.s = SSTV(False, 48000, 16)
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self.s.VIS_CODE = 0x00
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self.s.SYNC = 7
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def test_horizontal_sync(self):
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horizontal_sync = self.s.horizontal_sync()
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expected = (1200, self.s.SYNC)
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actual = next(iter(horizontal_sync))
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self.assertEqual(expected, actual)
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def test_gen_freq_bits(self):
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gen_freq_bits = self.s.gen_freq_bits()
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expected = [(1900, 300),
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(1200, 10),
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(1900, 300),
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(1200, 30),
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(1300, 30),
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(1300, 30),
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(1300, 30),
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(1300, 30),
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(1300, 30),
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(1300, 30),
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(1300, 30),
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(1300, 30),
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(1200, 30)]
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actual = list(islice(gen_freq_bits, 0, 1000))
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self.assertEqual(expected, actual)
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# FIXME: Instead of using a test fixture, 'expected' should be synthesized?
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def test_gen_values(self):
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gen_values = self.s.gen_values()
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with open(get_asset_filename("SSTV_gen_values.p"), 'rb') as f:
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expected = pickle.load(f)
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for e, g in zip(expected, gen_values):
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self.assertAlmostEqual(e, g, delta=0.000000001)
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def test_gen_samples(self):
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gen_values = self.s.gen_samples()
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# gen_samples uses random to avoid quantization noise
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# by using additive noise, so there's always a chance
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# of running the code two consecutive times on the same machine
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# and having different results.
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# https://en.wikipedia.org/wiki/Quantization_%28signal_processing%29
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sstv.random = MagicMock(return_value=0.4) # xkcd:221
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with open(get_asset_filename("SSTV_gen_samples.p"), 'rb') as f:
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expected = pickle.load(f)
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actual = list(islice(gen_values, 0, 1000))
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for e, a in zip(expected, actual):
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self.assertAlmostEqual(e, a, delta=1)
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def test_write_wav(self):
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self.maxDiff = None
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bio = BytesIO()
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bio.close = MagicMock() # ignore close() so we can .getvalue()
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mock_open = MagicMock(return_value=bio)
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ns = '__builtin__' if PY2 else 'builtins'
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with mock.patch('{0}.open'.format(ns), mock_open):
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self.s.write_wav('unittest.wav')
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expected = 'dd7eed880ab3360fb79ce09c469deee2'
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data = bio.getvalue()
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actual = hashlib.md5(data).hexdigest()
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self.assertEqual(expected, actual)
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def test_init(self):
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self.assertEqual(self.s.image, False)
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self.assertEqual(self.s.samples_per_sec, 48000)
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self.assertEqual(self.s.bits, 16)
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