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245 lines
7.7 KiB
Python
245 lines
7.7 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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class CommonMemoryTests:
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#
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# Tests common to direct memoryviews and sliced memoryviews
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#
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base_object = b"abcdef"
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def check_getitem_with_type(self, tp):
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b = tp(self.base_object)
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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self.assertEquals(m[0], b"a")
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self.assert_(isinstance(m[0], bytes), type(m[0]))
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self.assertEquals(m[5], b"f")
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self.assertEquals(m[-1], b"f")
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self.assertEquals(m[-6], 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.assertEquals(sys.getrefcount(b), oldrefcount)
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def test_getitem_readonly(self):
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self.check_getitem_with_type(bytes)
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def test_getitem_writable(self):
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self.check_getitem_with_type(bytearray)
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def test_setitem_readonly(self):
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b = self.base_object
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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.assertEquals(sys.getrefcount(b), oldrefcount)
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def test_setitem_writable(self):
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b = bytearray(self.base_object)
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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m[0] = b"0"
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self._check_contents(b, b"0bcdef")
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m[1:3] = b"12"
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self._check_contents(b, b"012def")
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m[1:1] = b""
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self._check_contents(b, b"012def")
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m[:] = b"abcdef"
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self._check_contents(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(b, b"cdedef")
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m[:] = b"abcdef"
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m[2:5] = m[0:3]
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self._check_contents(b, b"ababcf")
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def setitem(key, value):
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m[key] = 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, "a", b"a")
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# Trying to resize the memory object
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self.assertRaises(ValueError, setitem, 0, b"")
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self.assertRaises(ValueError, 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.assertEquals(sys.getrefcount(b), oldrefcount)
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def test_len(self):
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self.assertEquals(len(self._view(self.base_object)), 6)
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def test_tobytes(self):
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m = self._view(self.base_object)
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b = m.tobytes()
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self.assertEquals(b, b"abcdef")
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self.assert_(isinstance(b, bytes), type(b))
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def test_tolist(self):
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m = self._view(self.base_object)
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l = m.tolist()
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self.assertEquals(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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m = self._view(self.base_object)
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for tp in (bytes, bytearray):
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self.assertTrue(m == tp(b"abcdef"))
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self.assertFalse(m != tp(b"abcdef"))
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self.assertFalse(m == tp(b"abcde"))
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self.assertTrue(m != tp(b"abcde"))
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self.assertFalse(m == tp(b"abcde1"))
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self.assertTrue(m != tp(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 == "abc")
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self.assertTrue(m != "abc")
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self.assertFalse("abc" == m)
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self.assertTrue("abc" != 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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b = tp(self.base_object)
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m = self._view(b)
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self.assertEquals(m.format, 'B')
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self.assertEquals(m.itemsize, 1)
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self.assertEquals(m.ndim, 1)
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self.assertEquals(m.shape, (6,))
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self.assertEquals(len(m), 6)
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self.assertEquals(m.strides, (1,))
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self.assertEquals(m.suboffsets, None)
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return m
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def test_attributes_readonly(self):
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m = self.check_attributes_with_type(bytes)
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self.assertEquals(m.readonly, True)
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def test_attributes_writable(self):
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m = self.check_attributes_with_type(bytearray)
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self.assertEquals(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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b = self.base_object
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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(b, s.encode("utf-8"))
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self.assertEquals(sys.getrefcount(m), oldviewrefcount)
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m = None
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self.assertEquals(sys.getrefcount(b), oldrefcount)
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def test_gc(self):
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class MyBytes(bytes):
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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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b = MyBytes(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.assert_(wr() is None, wr())
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class MemoryviewTest(unittest.TestCase, CommonMemoryTests):
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def _view(self, obj):
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return memoryview(obj)
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def _check_contents(self, obj, contents):
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self.assertEquals(obj, contents)
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def test_constructor(self):
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ob = b'test'
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self.assert_(memoryview(ob))
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self.assert_(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 MemorySliceTest(unittest.TestCase, CommonMemoryTests):
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base_object = 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, obj, contents):
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self.assertEquals(obj[1:7], contents)
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def test_refs(self):
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m = memoryview(b"ab")
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oldrefcount = sys.getrefcount(m)
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m[1:2]
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self.assertEquals(sys.getrefcount(m), oldrefcount)
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class MemorySliceSliceTest(unittest.TestCase, CommonMemoryTests):
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base_object = 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, obj, contents):
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self.assertEquals(obj[1:7], contents)
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def test_main():
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test.support.run_unittest(
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MemoryviewTest, MemorySliceTest, MemorySliceSliceTest)
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if __name__ == "__main__":
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test_main()
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