| """Unit tests for the memoryview |
| |
| XXX We need more tests! Some tests are in test_bytes |
| """ |
| |
| import unittest |
| import test.support |
| import sys |
| |
| |
| class CommonMemoryTests: |
| # |
| # Tests common to direct memoryviews and sliced memoryviews |
| # |
| |
| base_object = b"abcdef" |
| |
| def check_getitem_with_type(self, tp): |
| b = tp(self.base_object) |
| oldrefcount = sys.getrefcount(b) |
| m = self._view(b) |
| self.assertEquals(m[0], b"a") |
| self.assert_(isinstance(m[0], bytes), type(m[0])) |
| self.assertEquals(m[5], b"f") |
| self.assertEquals(m[-1], b"f") |
| self.assertEquals(m[-6], b"a") |
| # Bounds checking |
| self.assertRaises(IndexError, lambda: m[6]) |
| self.assertRaises(IndexError, lambda: m[-7]) |
| self.assertRaises(IndexError, lambda: m[sys.maxsize]) |
| self.assertRaises(IndexError, lambda: m[-sys.maxsize]) |
| # Type checking |
| self.assertRaises(TypeError, lambda: m[None]) |
| self.assertRaises(TypeError, lambda: m[0.0]) |
| self.assertRaises(TypeError, lambda: m["a"]) |
| m = None |
| self.assertEquals(sys.getrefcount(b), oldrefcount) |
| |
| def test_getitem_readonly(self): |
| self.check_getitem_with_type(bytes) |
| |
| def test_getitem_writable(self): |
| self.check_getitem_with_type(bytearray) |
| |
| def test_setitem_readonly(self): |
| b = self.base_object |
| oldrefcount = sys.getrefcount(b) |
| m = self._view(b) |
| def setitem(value): |
| m[0] = value |
| self.assertRaises(TypeError, setitem, b"a") |
| self.assertRaises(TypeError, setitem, 65) |
| self.assertRaises(TypeError, setitem, memoryview(b"a")) |
| m = None |
| self.assertEquals(sys.getrefcount(b), oldrefcount) |
| |
| def test_setitem_writable(self): |
| b = bytearray(self.base_object) |
| oldrefcount = sys.getrefcount(b) |
| m = self._view(b) |
| m[0] = b"0" |
| self._check_contents(b, b"0bcdef") |
| m[1:3] = b"12" |
| self._check_contents(b, b"012def") |
| m[1:1] = b"" |
| self._check_contents(b, b"012def") |
| m[:] = b"abcdef" |
| self._check_contents(b, b"abcdef") |
| |
| # Overlapping copies of a view into itself |
| m[0:3] = m[2:5] |
| self._check_contents(b, b"cdedef") |
| m[:] = b"abcdef" |
| m[2:5] = m[0:3] |
| self._check_contents(b, b"ababcf") |
| |
| def setitem(key, value): |
| m[key] = value |
| # Bounds checking |
| self.assertRaises(IndexError, setitem, 6, b"a") |
| self.assertRaises(IndexError, setitem, -7, b"a") |
| self.assertRaises(IndexError, setitem, sys.maxsize, b"a") |
| self.assertRaises(IndexError, setitem, -sys.maxsize, b"a") |
| # Wrong index/slice types |
| self.assertRaises(TypeError, setitem, 0.0, b"a") |
| self.assertRaises(TypeError, setitem, (0,), b"a") |
| self.assertRaises(TypeError, setitem, "a", b"a") |
| # Trying to resize the memory object |
| self.assertRaises(ValueError, setitem, 0, b"") |
| self.assertRaises(ValueError, setitem, 0, b"ab") |
| self.assertRaises(ValueError, setitem, slice(1,1), b"a") |
| self.assertRaises(ValueError, setitem, slice(0,2), b"a") |
| |
| m = None |
| self.assertEquals(sys.getrefcount(b), oldrefcount) |
| |
| def test_len(self): |
| self.assertEquals(len(self._view(self.base_object)), 6) |
| |
| def test_tobytes(self): |
| m = self._view(self.base_object) |
| b = m.tobytes() |
| self.assertEquals(b, b"abcdef") |
| self.assert_(isinstance(b, bytes), type(b)) |
| |
| def test_tolist(self): |
| m = self._view(self.base_object) |
| l = m.tolist() |
| self.assertEquals(l, list(b"abcdef")) |
| |
| def test_compare(self): |
| # memoryviews can compare for equality with other objects |
| # having the buffer interface. |
| m = self._view(self.base_object) |
| for tp in (bytes, bytearray): |
| self.assertTrue(m == tp(b"abcdef")) |
| self.assertFalse(m != tp(b"abcdef")) |
| self.assertFalse(m == tp(b"abcde")) |
| self.assertTrue(m != tp(b"abcde")) |
| self.assertFalse(m == tp(b"abcde1")) |
| self.assertTrue(m != tp(b"abcde1")) |
| self.assertTrue(m == m) |
| self.assertTrue(m == m[:]) |
| self.assertTrue(m[0:6] == m[:]) |
| self.assertFalse(m[0:5] == m) |
| |
| # Comparison with objects which don't support the buffer API |
| self.assertFalse(m == "abc") |
| self.assertTrue(m != "abc") |
| self.assertFalse("abc" == m) |
| self.assertTrue("abc" != m) |
| |
| # Unordered comparisons |
| for c in (m, b"abcdef"): |
| self.assertRaises(TypeError, lambda: m < c) |
| self.assertRaises(TypeError, lambda: c <= m) |
| self.assertRaises(TypeError, lambda: m >= c) |
| self.assertRaises(TypeError, lambda: c > m) |
| |
| def check_attributes_with_type(self, tp): |
| b = tp(self.base_object) |
| m = self._view(b) |
| self.assertEquals(m.format, 'B') |
| self.assertEquals(m.itemsize, 1) |
| self.assertEquals(m.ndim, 1) |
| self.assertEquals(m.shape, (6,)) |
| self.assertEquals(m.size, 6) |
| self.assertEquals(m.strides, (1,)) |
| self.assertEquals(m.suboffsets, None) |
| return m |
| |
| def test_attributes_readonly(self): |
| m = self.check_attributes_with_type(bytes) |
| self.assertEquals(m.readonly, True) |
| |
| def test_attributes_writable(self): |
| m = self.check_attributes_with_type(bytearray) |
| self.assertEquals(m.readonly, False) |
| |
| |
| class MemoryviewTest(unittest.TestCase, CommonMemoryTests): |
| |
| def _view(self, obj): |
| return memoryview(obj) |
| |
| def _check_contents(self, obj, contents): |
| self.assertEquals(obj, contents) |
| |
| def test_constructor(self): |
| ob = b'test' |
| self.assert_(memoryview(ob)) |
| self.assert_(memoryview(object=ob)) |
| self.assertRaises(TypeError, memoryview) |
| self.assertRaises(TypeError, memoryview, ob, ob) |
| self.assertRaises(TypeError, memoryview, argument=ob) |
| self.assertRaises(TypeError, memoryview, ob, argument=True) |
| |
| |
| class MemorySliceTest(unittest.TestCase, CommonMemoryTests): |
| base_object = b"XabcdefY" |
| |
| def _view(self, obj): |
| m = memoryview(obj) |
| return m[1:7] |
| |
| def _check_contents(self, obj, contents): |
| self.assertEquals(obj[1:7], contents) |
| |
| def test_refs(self): |
| m = memoryview(b"ab") |
| oldrefcount = sys.getrefcount(m) |
| m[1:2] |
| self.assertEquals(sys.getrefcount(m), oldrefcount) |
| |
| |
| class MemorySliceSliceTest(unittest.TestCase, CommonMemoryTests): |
| base_object = b"XabcdefY" |
| |
| def _view(self, obj): |
| m = memoryview(obj) |
| return m[:7][1:] |
| |
| def _check_contents(self, obj, contents): |
| self.assertEquals(obj[1:7], contents) |
| |
| |
| def test_main(): |
| test.support.run_unittest( |
| MemoryviewTest, MemorySliceTest, MemorySliceSliceTest) |
| |
| |
| if __name__ == "__main__": |
| test_main() |