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import unittest
from Xlib.protocol.display import bytesview
class BytesViewTest(unittest.TestCase):
def test(self):
with self.assertRaises(TypeError):
bytesview('foobar')
data = b'0123456789ABCDEF'
view = bytesview(data)
self.assertEqual(len(view), 16)
self.assertEqual(view[:], data)
self.assertIsInstance(view[:], bytes)
self.assertEqual(view[5:-6], b'56789')
self.assertEqual(view[7], ord('7'))
view = bytesview(view, 5)
self.assertEqual(view[:], b'56789ABCDEF')
self.assertEqual(view[4], ord('9'))
view = bytesview(view, 0, 5)
self.assertEqual(view[:], b'56789')
self.assertEqual(view[1], ord('6'))
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