mirror of https://github.com/python/cpython
469 lines
15 KiB
Python
469 lines
15 KiB
Python
"""Unit tests for the memoryview
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XXX We need more tests! Some tests are in test_bytes
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"""
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import unittest
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import test.support
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import sys
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import gc
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import weakref
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import array
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import io
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class AbstractMemoryTests:
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source_bytes = b"abcdef"
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@property
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def _source(self):
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return self.source_bytes
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@property
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def _types(self):
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return filter(None, [self.ro_type, self.rw_type])
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def check_getitem_with_type(self, tp):
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b = tp(self._source)
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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self.assertEqual(m[0], ord(b"a"))
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self.assertIsInstance(m[0], int)
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self.assertEqual(m[5], ord(b"f"))
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self.assertEqual(m[-1], ord(b"f"))
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self.assertEqual(m[-6], ord(b"a"))
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# Bounds checking
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self.assertRaises(IndexError, lambda: m[6])
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self.assertRaises(IndexError, lambda: m[-7])
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self.assertRaises(IndexError, lambda: m[sys.maxsize])
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self.assertRaises(IndexError, lambda: m[-sys.maxsize])
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# Type checking
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self.assertRaises(TypeError, lambda: m[None])
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self.assertRaises(TypeError, lambda: m[0.0])
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self.assertRaises(TypeError, lambda: m["a"])
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m = None
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self.assertEqual(sys.getrefcount(b), oldrefcount)
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def test_getitem(self):
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for tp in self._types:
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self.check_getitem_with_type(tp)
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def test_iter(self):
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for tp in self._types:
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b = tp(self._source)
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m = self._view(b)
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self.assertEqual(list(m), [m[i] for i in range(len(m))])
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def test_setitem_readonly(self):
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if not self.ro_type:
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return
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b = self.ro_type(self._source)
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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def setitem(value):
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m[0] = value
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self.assertRaises(TypeError, setitem, b"a")
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self.assertRaises(TypeError, setitem, 65)
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self.assertRaises(TypeError, setitem, memoryview(b"a"))
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m = None
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self.assertEqual(sys.getrefcount(b), oldrefcount)
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def test_setitem_writable(self):
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if not self.rw_type:
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return
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tp = self.rw_type
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b = self.rw_type(self._source)
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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m[0] = ord(b'1')
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self._check_contents(tp, b, b"1bcdef")
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m[0:1] = tp(b"0")
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self._check_contents(tp, b, b"0bcdef")
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m[1:3] = tp(b"12")
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self._check_contents(tp, b, b"012def")
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m[1:1] = tp(b"")
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self._check_contents(tp, b, b"012def")
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m[:] = tp(b"abcdef")
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self._check_contents(tp, b, b"abcdef")
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# Overlapping copies of a view into itself
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m[0:3] = m[2:5]
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self._check_contents(tp, b, b"cdedef")
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m[:] = tp(b"abcdef")
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m[2:5] = m[0:3]
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self._check_contents(tp, b, b"ababcf")
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def setitem(key, value):
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m[key] = tp(value)
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# Bounds checking
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self.assertRaises(IndexError, setitem, 6, b"a")
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self.assertRaises(IndexError, setitem, -7, b"a")
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self.assertRaises(IndexError, setitem, sys.maxsize, b"a")
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self.assertRaises(IndexError, setitem, -sys.maxsize, b"a")
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# Wrong index/slice types
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self.assertRaises(TypeError, setitem, 0.0, b"a")
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self.assertRaises(TypeError, setitem, (0,), b"a")
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self.assertRaises(TypeError, setitem, (slice(0,1,1), 0), b"a")
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self.assertRaises(TypeError, setitem, (0, slice(0,1,1)), b"a")
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self.assertRaises(TypeError, setitem, (0,), b"a")
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self.assertRaises(TypeError, setitem, "a", b"a")
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# Not implemented: multidimensional slices
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slices = (slice(0,1,1), slice(0,1,2))
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self.assertRaises(NotImplementedError, setitem, slices, b"a")
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# Trying to resize the memory object
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exc = ValueError if m.format == 'c' else TypeError
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self.assertRaises(exc, setitem, 0, b"")
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self.assertRaises(exc, setitem, 0, b"ab")
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self.assertRaises(ValueError, setitem, slice(1,1), b"a")
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self.assertRaises(ValueError, setitem, slice(0,2), b"a")
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m = None
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self.assertEqual(sys.getrefcount(b), oldrefcount)
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def test_delitem(self):
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for tp in self._types:
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b = tp(self._source)
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m = self._view(b)
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with self.assertRaises(TypeError):
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del m[1]
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with self.assertRaises(TypeError):
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del m[1:4]
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def test_tobytes(self):
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for tp in self._types:
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m = self._view(tp(self._source))
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b = m.tobytes()
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# This calls self.getitem_type() on each separate byte of b"abcdef"
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expected = b"".join(
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self.getitem_type(bytes([c])) for c in b"abcdef")
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self.assertEqual(b, expected)
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self.assertIsInstance(b, bytes)
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def test_tolist(self):
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for tp in self._types:
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m = self._view(tp(self._source))
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l = m.tolist()
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self.assertEqual(l, list(b"abcdef"))
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def test_compare(self):
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# memoryviews can compare for equality with other objects
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# having the buffer interface.
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for tp in self._types:
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m = self._view(tp(self._source))
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for tp_comp in self._types:
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self.assertTrue(m == tp_comp(b"abcdef"))
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self.assertFalse(m != tp_comp(b"abcdef"))
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self.assertFalse(m == tp_comp(b"abcde"))
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self.assertTrue(m != tp_comp(b"abcde"))
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self.assertFalse(m == tp_comp(b"abcde1"))
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self.assertTrue(m != tp_comp(b"abcde1"))
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self.assertTrue(m == m)
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self.assertTrue(m == m[:])
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self.assertTrue(m[0:6] == m[:])
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self.assertFalse(m[0:5] == m)
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# Comparison with objects which don't support the buffer API
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self.assertFalse(m == "abcdef")
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self.assertTrue(m != "abcdef")
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self.assertFalse("abcdef" == m)
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self.assertTrue("abcdef" != m)
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# Unordered comparisons
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for c in (m, b"abcdef"):
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self.assertRaises(TypeError, lambda: m < c)
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self.assertRaises(TypeError, lambda: c <= m)
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self.assertRaises(TypeError, lambda: m >= c)
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self.assertRaises(TypeError, lambda: c > m)
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def check_attributes_with_type(self, tp):
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m = self._view(tp(self._source))
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self.assertEqual(m.format, self.format)
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self.assertEqual(m.itemsize, self.itemsize)
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self.assertEqual(m.ndim, 1)
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self.assertEqual(m.shape, (6,))
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self.assertEqual(len(m), 6)
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self.assertEqual(m.strides, (self.itemsize,))
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self.assertEqual(m.suboffsets, ())
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return m
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def test_attributes_readonly(self):
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if not self.ro_type:
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return
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m = self.check_attributes_with_type(self.ro_type)
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self.assertEqual(m.readonly, True)
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def test_attributes_writable(self):
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if not self.rw_type:
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return
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m = self.check_attributes_with_type(self.rw_type)
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self.assertEqual(m.readonly, False)
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def test_getbuffer(self):
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# Test PyObject_GetBuffer() on a memoryview object.
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for tp in self._types:
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b = tp(self._source)
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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oldviewrefcount = sys.getrefcount(m)
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s = str(m, "utf-8")
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self._check_contents(tp, b, s.encode("utf-8"))
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self.assertEqual(sys.getrefcount(m), oldviewrefcount)
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m = None
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self.assertEqual(sys.getrefcount(b), oldrefcount)
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def test_gc(self):
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for tp in self._types:
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if not isinstance(tp, type):
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# If tp is a factory rather than a plain type, skip
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continue
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class MyView():
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def __init__(self, base):
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self.m = memoryview(base)
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class MySource(tp):
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pass
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class MyObject:
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pass
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# Create a reference cycle through a memoryview object.
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# This exercises mbuf_clear().
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b = MySource(tp(b'abc'))
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m = self._view(b)
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o = MyObject()
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b.m = m
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b.o = o
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wr = weakref.ref(o)
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b = m = o = None
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# The cycle must be broken
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gc.collect()
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self.assertTrue(wr() is None, wr())
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# This exercises memory_clear().
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m = MyView(tp(b'abc'))
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o = MyObject()
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m.x = m
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m.o = o
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wr = weakref.ref(o)
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m = o = None
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# The cycle must be broken
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gc.collect()
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self.assertTrue(wr() is None, wr())
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def _check_released(self, m, tp):
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check = self.assertRaisesRegex(ValueError, "released")
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with check: bytes(m)
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with check: m.tobytes()
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with check: m.tolist()
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with check: m[0]
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with check: m[0] = b'x'
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with check: len(m)
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with check: m.format
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with check: m.itemsize
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with check: m.ndim
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with check: m.readonly
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with check: m.shape
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with check: m.strides
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with check:
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with m:
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pass
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# str() and repr() still function
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self.assertIn("released memory", str(m))
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self.assertIn("released memory", repr(m))
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self.assertEqual(m, m)
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self.assertNotEqual(m, memoryview(tp(self._source)))
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self.assertNotEqual(m, tp(self._source))
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def test_contextmanager(self):
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for tp in self._types:
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b = tp(self._source)
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m = self._view(b)
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with m as cm:
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self.assertIs(cm, m)
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self._check_released(m, tp)
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m = self._view(b)
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# Can release explicitly inside the context manager
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with m:
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m.release()
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def test_release(self):
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for tp in self._types:
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b = tp(self._source)
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m = self._view(b)
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m.release()
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self._check_released(m, tp)
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# Can be called a second time (it's a no-op)
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m.release()
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self._check_released(m, tp)
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def test_writable_readonly(self):
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# Issue #10451: memoryview incorrectly exposes a readonly
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# buffer as writable causing a segfault if using mmap
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tp = self.ro_type
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if tp is None:
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return
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b = tp(self._source)
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m = self._view(b)
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i = io.BytesIO(b'ZZZZ')
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self.assertRaises(TypeError, i.readinto, m)
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def test_getbuf_fail(self):
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self.assertRaises(TypeError, self._view, {})
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def test_hash(self):
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# Memoryviews of readonly (hashable) types are hashable, and they
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# hash as hash(obj.tobytes()).
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tp = self.ro_type
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if tp is None:
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self.skipTest("no read-only type to test")
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b = tp(self._source)
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m = self._view(b)
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self.assertEqual(hash(m), hash(b"abcdef"))
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# Releasing the memoryview keeps the stored hash value (as with weakrefs)
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m.release()
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self.assertEqual(hash(m), hash(b"abcdef"))
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# Hashing a memoryview for the first time after it is released
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# results in an error (as with weakrefs).
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m = self._view(b)
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m.release()
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self.assertRaises(ValueError, hash, m)
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def test_hash_writable(self):
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# Memoryviews of writable types are unhashable
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tp = self.rw_type
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if tp is None:
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self.skipTest("no writable type to test")
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b = tp(self._source)
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m = self._view(b)
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self.assertRaises(ValueError, hash, m)
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def test_weakref(self):
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# Check memoryviews are weakrefable
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for tp in self._types:
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b = tp(self._source)
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m = self._view(b)
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L = []
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def callback(wr, b=b):
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L.append(b)
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wr = weakref.ref(m, callback)
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self.assertIs(wr(), m)
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del m
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test.support.gc_collect()
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self.assertIs(wr(), None)
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self.assertIs(L[0], b)
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# Variations on source objects for the buffer: bytes-like objects, then arrays
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# with itemsize > 1.
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# NOTE: support for multi-dimensional objects is unimplemented.
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class BaseBytesMemoryTests(AbstractMemoryTests):
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ro_type = bytes
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rw_type = bytearray
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getitem_type = bytes
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itemsize = 1
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format = 'B'
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class BaseArrayMemoryTests(AbstractMemoryTests):
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ro_type = None
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rw_type = lambda self, b: array.array('i', list(b))
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getitem_type = lambda self, b: array.array('i', list(b)).tobytes()
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itemsize = array.array('i').itemsize
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format = 'i'
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def test_getbuffer(self):
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# XXX Test should be adapted for non-byte buffers
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pass
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def test_tolist(self):
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# XXX NotImplementedError: tolist() only supports byte views
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pass
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# Variations on indirection levels: memoryview, slice of memoryview,
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# slice of slice of memoryview.
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# This is important to test allocation subtleties.
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class BaseMemoryviewTests:
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def _view(self, obj):
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return memoryview(obj)
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def _check_contents(self, tp, obj, contents):
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self.assertEqual(obj, tp(contents))
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class BaseMemorySliceTests:
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source_bytes = b"XabcdefY"
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def _view(self, obj):
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m = memoryview(obj)
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return m[1:7]
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def _check_contents(self, tp, obj, contents):
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self.assertEqual(obj[1:7], tp(contents))
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def test_refs(self):
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for tp in self._types:
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m = memoryview(tp(self._source))
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oldrefcount = sys.getrefcount(m)
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m[1:2]
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self.assertEqual(sys.getrefcount(m), oldrefcount)
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class BaseMemorySliceSliceTests:
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source_bytes = b"XabcdefY"
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def _view(self, obj):
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m = memoryview(obj)
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return m[:7][1:]
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def _check_contents(self, tp, obj, contents):
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self.assertEqual(obj[1:7], tp(contents))
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# Concrete test classes
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class BytesMemoryviewTest(unittest.TestCase,
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BaseMemoryviewTests, BaseBytesMemoryTests):
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def test_constructor(self):
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for tp in self._types:
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ob = tp(self._source)
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self.assertTrue(memoryview(ob))
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self.assertTrue(memoryview(object=ob))
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self.assertRaises(TypeError, memoryview)
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self.assertRaises(TypeError, memoryview, ob, ob)
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self.assertRaises(TypeError, memoryview, argument=ob)
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self.assertRaises(TypeError, memoryview, ob, argument=True)
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class ArrayMemoryviewTest(unittest.TestCase,
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BaseMemoryviewTests, BaseArrayMemoryTests):
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def test_array_assign(self):
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# Issue #4569: segfault when mutating a memoryview with itemsize != 1
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a = array.array('i', range(10))
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m = memoryview(a)
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new_a = array.array('i', range(9, -1, -1))
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m[:] = new_a
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self.assertEqual(a, new_a)
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class BytesMemorySliceTest(unittest.TestCase,
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BaseMemorySliceTests, BaseBytesMemoryTests):
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pass
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class ArrayMemorySliceTest(unittest.TestCase,
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BaseMemorySliceTests, BaseArrayMemoryTests):
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pass
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class BytesMemorySliceSliceTest(unittest.TestCase,
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BaseMemorySliceSliceTests, BaseBytesMemoryTests):
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pass
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class ArrayMemorySliceSliceTest(unittest.TestCase,
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BaseMemorySliceSliceTests, BaseArrayMemoryTests):
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pass
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def test_main():
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test.support.run_unittest(__name__)
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if __name__ == "__main__":
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test_main()
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