"""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()