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153 lines
5 KiB
Python
153 lines
5 KiB
Python
"""Unit tests for the PickleBuffer object.
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Pickling tests themselves are in pickletester.py.
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"""
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import gc
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from pickle import PickleBuffer
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import weakref
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import unittest
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from test import support
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class B(bytes):
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pass
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class PickleBufferTest(unittest.TestCase):
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def check_memoryview(self, pb, equiv):
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with memoryview(pb) as m:
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with memoryview(equiv) as expected:
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self.assertEqual(m.nbytes, expected.nbytes)
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self.assertEqual(m.readonly, expected.readonly)
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self.assertEqual(m.itemsize, expected.itemsize)
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self.assertEqual(m.shape, expected.shape)
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self.assertEqual(m.strides, expected.strides)
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self.assertEqual(m.c_contiguous, expected.c_contiguous)
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self.assertEqual(m.f_contiguous, expected.f_contiguous)
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self.assertEqual(m.format, expected.format)
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self.assertEqual(m.tobytes(), expected.tobytes())
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def test_constructor_failure(self):
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with self.assertRaises(TypeError):
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PickleBuffer()
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with self.assertRaises(TypeError):
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PickleBuffer("foo")
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# Released memoryview fails taking a buffer
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m = memoryview(b"foo")
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m.release()
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with self.assertRaises(ValueError):
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PickleBuffer(m)
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def test_basics(self):
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pb = PickleBuffer(b"foo")
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self.assertEqual(b"foo", bytes(pb))
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with memoryview(pb) as m:
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self.assertTrue(m.readonly)
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pb = PickleBuffer(bytearray(b"foo"))
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self.assertEqual(b"foo", bytes(pb))
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with memoryview(pb) as m:
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self.assertFalse(m.readonly)
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m[0] = 48
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self.assertEqual(b"0oo", bytes(pb))
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def test_release(self):
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pb = PickleBuffer(b"foo")
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pb.release()
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with self.assertRaises(ValueError) as raises:
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memoryview(pb)
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self.assertIn("operation forbidden on released PickleBuffer object",
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str(raises.exception))
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# Idempotency
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pb.release()
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def test_cycle(self):
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b = B(b"foo")
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pb = PickleBuffer(b)
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b.cycle = pb
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wpb = weakref.ref(pb)
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del b, pb
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gc.collect()
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self.assertIsNone(wpb())
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def test_ndarray_2d(self):
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# C-contiguous
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ndarray = support.import_module("_testbuffer").ndarray
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arr = ndarray(list(range(12)), shape=(4, 3), format='<i')
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self.assertTrue(arr.c_contiguous)
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self.assertFalse(arr.f_contiguous)
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pb = PickleBuffer(arr)
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self.check_memoryview(pb, arr)
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# Non-contiguous
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arr = arr[::2]
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self.assertFalse(arr.c_contiguous)
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self.assertFalse(arr.f_contiguous)
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pb = PickleBuffer(arr)
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self.check_memoryview(pb, arr)
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# F-contiguous
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arr = ndarray(list(range(12)), shape=(3, 4), strides=(4, 12), format='<i')
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self.assertTrue(arr.f_contiguous)
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self.assertFalse(arr.c_contiguous)
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pb = PickleBuffer(arr)
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self.check_memoryview(pb, arr)
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# Tests for PickleBuffer.raw()
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def check_raw(self, obj, equiv):
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pb = PickleBuffer(obj)
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with pb.raw() as m:
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self.assertIsInstance(m, memoryview)
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self.check_memoryview(m, equiv)
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def test_raw(self):
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for obj in (b"foo", bytearray(b"foo")):
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with self.subTest(obj=obj):
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self.check_raw(obj, obj)
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def test_raw_ndarray(self):
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# 1-D, contiguous
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ndarray = support.import_module("_testbuffer").ndarray
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arr = ndarray(list(range(3)), shape=(3,), format='<h')
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equiv = b"\x00\x00\x01\x00\x02\x00"
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self.check_raw(arr, equiv)
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# 2-D, C-contiguous
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arr = ndarray(list(range(6)), shape=(2, 3), format='<h')
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equiv = b"\x00\x00\x01\x00\x02\x00\x03\x00\x04\x00\x05\x00"
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self.check_raw(arr, equiv)
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# 2-D, F-contiguous
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arr = ndarray(list(range(6)), shape=(2, 3), strides=(2, 4),
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format='<h')
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# Note this is different from arr.tobytes()
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equiv = b"\x00\x00\x01\x00\x02\x00\x03\x00\x04\x00\x05\x00"
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self.check_raw(arr, equiv)
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# 0-D
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arr = ndarray(456, shape=(), format='<i')
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equiv = b'\xc8\x01\x00\x00'
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self.check_raw(arr, equiv)
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def check_raw_non_contiguous(self, obj):
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pb = PickleBuffer(obj)
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with self.assertRaisesRegex(BufferError, "non-contiguous"):
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pb.raw()
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def test_raw_non_contiguous(self):
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# 1-D
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ndarray = support.import_module("_testbuffer").ndarray
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arr = ndarray(list(range(6)), shape=(6,), format='<i')[::2]
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self.check_raw_non_contiguous(arr)
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# 2-D
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arr = ndarray(list(range(12)), shape=(4, 3), format='<i')[::2]
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self.check_raw_non_contiguous(arr)
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def test_raw_released(self):
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pb = PickleBuffer(b"foo")
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pb.release()
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with self.assertRaises(ValueError) as raises:
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pb.raw()
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if __name__ == "__main__":
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unittest.main()
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