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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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