def test_synchsafe_then_unsynchsafe_zero(self):
size = 0
encoded = synchsafe(size)
decoded = unsynchsafe(encoded)
self.assertEqual(decoded, size)
def test_synchsafe_then_unsynchsafe_high(self):
size = 42949672
encoded = synchsafe(size)
decoded = unsynchsafe(encoded)
self.assertEqual(decoded, size)
def test_synchsafe_then_unsynchsafe_low(self):
size = 2 ** 6
encoded = synchsafe(size)
decoded = unsynchsafe(encoded)
self.assertEqual(decoded, size)
def test_deserializes(self):
"""Deserializes from bytes"""
# Arrange
f = TagHeader.Flags # for brevity's sake
byte_string = b'ID3\x03\x01\x60\x00\x00\x0A\x0A'
flags = f.Experimental | f.Extended
major = 3
minor = 1
expected_tag_size = unsynchsafe(0x0A0A)
# System under test / Act
header = TagHeader.read(BytesIO(byte_string))
# Assert
self.assertEqual(len(header), 10)
self.assertEqual(header.tag_size, expected_tag_size)
self.assertEqual(header.major, major)
self.assertEqual(header.minor, minor)
self.assertEqual(header.flags, flags)
self.assertEqual(bytes(header), byte_string)
def read(self, stream, context) -> int:
return unsynchsafe(super().read(stream, context))
def test_unsynchsafe_small_int(self):
size = 0b01111111
self.assertEqual(unsynchsafe(size), size)
def test_unsynchsafe_highest_possible_int(self):
self.assertEqual(unsynchsafe(0x7f7f7f7f), 2 ** 28 - 1)
def test_unsynchsafe_example_from_specification(self):
size = 0x0201
expected = 257
self.assertEqual(unsynchsafe(size), expected)