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✏️ test_buffer.py

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"""Unit tests for buffer objects.

For now, tests just new or changed functionality.

"""

import copy
import pickle
import sys
import unittest
import warnings
from test import test_support

class BufferTests(unittest.TestCase):

def test_extended_getslice(self):
        # Test extended slicing by comparing with list slicing.
        s = "".join(chr(c) for c in list(range(255, -1, -1)))
        b = buffer(s)
        indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
        for start in indices:
            for stop in indices:
                # Skip step 0 (invalid)
                for step in indices[1:]:
                    self.assertEqual(b[start:stop:step],
                                     s[start:stop:step])

def test_newbuffer_interface(self):
        # Test that the buffer object has the new buffer interface
        # as used by the memoryview object
        s = "".join(chr(c) for c in list(range(255, -1, -1)))
        b = buffer(s)
        m = memoryview(b) # Should not raise an exception
        self.assertEqual(m.tobytes(), s)

def test_large_buffer_size_and_offset(self):
        data = bytearray('hola mundo')
        buf = buffer(data, sys.maxsize, sys.maxsize)
        self.assertEqual(buf[:4096], "")

def test_copy(self):
        buf = buffer(b'abc')
        with self.assertRaises(TypeError), warnings.catch_warnings():
            warnings.filterwarnings('ignore', ".*buffer", DeprecationWarning)
            copy.copy(buf)

@test_support.cpython_only
    def test_pickle(self):
        buf = buffer(b'abc')
        for proto in range(2):
            with self.assertRaises(TypeError):
                pickle.dumps(buf, proto)
        with test_support.check_py3k_warnings(
                (".*buffer", DeprecationWarning)):
            pickle.dumps(buf, 2)

def test_main():
    with test_support.check_py3k_warnings(("buffer.. not supported",
                                           DeprecationWarning)):
        test_support.run_unittest(BufferTests)

if __name__ == "__main__":
    test_main()

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✏️ test_buffer.py