Christian Heimes | 7b6fc8e | 2007-11-08 02:28:11 +0000 | [diff] [blame] | 1 | """Unit tests for the memoryview |
| 2 | |
| 3 | XXX We need more tests! Some tests are in test_bytes |
| 4 | """ |
| 5 | |
| 6 | import unittest |
Benjamin Peterson | ee8712c | 2008-05-20 21:35:26 +0000 | [diff] [blame] | 7 | import test.support |
Antoine Pitrou | 616d285 | 2008-08-19 22:09:34 +0000 | [diff] [blame] | 8 | import sys |
Antoine Pitrou | c6b09eb | 2008-09-01 15:10:14 +0000 | [diff] [blame^] | 9 | import gc |
| 10 | import weakref |
Christian Heimes | 7b6fc8e | 2007-11-08 02:28:11 +0000 | [diff] [blame] | 11 | |
Antoine Pitrou | 616d285 | 2008-08-19 22:09:34 +0000 | [diff] [blame] | 12 | |
| 13 | class CommonMemoryTests: |
| 14 | # |
| 15 | # Tests common to direct memoryviews and sliced memoryviews |
| 16 | # |
| 17 | |
| 18 | base_object = b"abcdef" |
| 19 | |
| 20 | def check_getitem_with_type(self, tp): |
| 21 | b = tp(self.base_object) |
| 22 | oldrefcount = sys.getrefcount(b) |
| 23 | m = self._view(b) |
| 24 | self.assertEquals(m[0], b"a") |
| 25 | self.assert_(isinstance(m[0], bytes), type(m[0])) |
| 26 | self.assertEquals(m[5], b"f") |
| 27 | self.assertEquals(m[-1], b"f") |
| 28 | self.assertEquals(m[-6], b"a") |
| 29 | # Bounds checking |
| 30 | self.assertRaises(IndexError, lambda: m[6]) |
| 31 | self.assertRaises(IndexError, lambda: m[-7]) |
| 32 | self.assertRaises(IndexError, lambda: m[sys.maxsize]) |
| 33 | self.assertRaises(IndexError, lambda: m[-sys.maxsize]) |
| 34 | # Type checking |
| 35 | self.assertRaises(TypeError, lambda: m[None]) |
| 36 | self.assertRaises(TypeError, lambda: m[0.0]) |
| 37 | self.assertRaises(TypeError, lambda: m["a"]) |
| 38 | m = None |
| 39 | self.assertEquals(sys.getrefcount(b), oldrefcount) |
| 40 | |
| 41 | def test_getitem_readonly(self): |
| 42 | self.check_getitem_with_type(bytes) |
| 43 | |
| 44 | def test_getitem_writable(self): |
| 45 | self.check_getitem_with_type(bytearray) |
| 46 | |
| 47 | def test_setitem_readonly(self): |
| 48 | b = self.base_object |
| 49 | oldrefcount = sys.getrefcount(b) |
| 50 | m = self._view(b) |
| 51 | def setitem(value): |
| 52 | m[0] = value |
| 53 | self.assertRaises(TypeError, setitem, b"a") |
| 54 | self.assertRaises(TypeError, setitem, 65) |
| 55 | self.assertRaises(TypeError, setitem, memoryview(b"a")) |
| 56 | m = None |
| 57 | self.assertEquals(sys.getrefcount(b), oldrefcount) |
| 58 | |
| 59 | def test_setitem_writable(self): |
| 60 | b = bytearray(self.base_object) |
| 61 | oldrefcount = sys.getrefcount(b) |
| 62 | m = self._view(b) |
| 63 | m[0] = b"0" |
| 64 | self._check_contents(b, b"0bcdef") |
| 65 | m[1:3] = b"12" |
| 66 | self._check_contents(b, b"012def") |
| 67 | m[1:1] = b"" |
| 68 | self._check_contents(b, b"012def") |
| 69 | m[:] = b"abcdef" |
| 70 | self._check_contents(b, b"abcdef") |
| 71 | |
| 72 | # Overlapping copies of a view into itself |
| 73 | m[0:3] = m[2:5] |
| 74 | self._check_contents(b, b"cdedef") |
| 75 | m[:] = b"abcdef" |
| 76 | m[2:5] = m[0:3] |
| 77 | self._check_contents(b, b"ababcf") |
| 78 | |
| 79 | def setitem(key, value): |
| 80 | m[key] = value |
| 81 | # Bounds checking |
| 82 | self.assertRaises(IndexError, setitem, 6, b"a") |
| 83 | self.assertRaises(IndexError, setitem, -7, b"a") |
| 84 | self.assertRaises(IndexError, setitem, sys.maxsize, b"a") |
| 85 | self.assertRaises(IndexError, setitem, -sys.maxsize, b"a") |
| 86 | # Wrong index/slice types |
| 87 | self.assertRaises(TypeError, setitem, 0.0, b"a") |
| 88 | self.assertRaises(TypeError, setitem, (0,), b"a") |
| 89 | self.assertRaises(TypeError, setitem, "a", b"a") |
| 90 | # Trying to resize the memory object |
| 91 | self.assertRaises(ValueError, setitem, 0, b"") |
| 92 | self.assertRaises(ValueError, setitem, 0, b"ab") |
| 93 | self.assertRaises(ValueError, setitem, slice(1,1), b"a") |
| 94 | self.assertRaises(ValueError, setitem, slice(0,2), b"a") |
| 95 | |
| 96 | m = None |
| 97 | self.assertEquals(sys.getrefcount(b), oldrefcount) |
| 98 | |
| 99 | def test_len(self): |
| 100 | self.assertEquals(len(self._view(self.base_object)), 6) |
| 101 | |
| 102 | def test_tobytes(self): |
| 103 | m = self._view(self.base_object) |
| 104 | b = m.tobytes() |
| 105 | self.assertEquals(b, b"abcdef") |
| 106 | self.assert_(isinstance(b, bytes), type(b)) |
| 107 | |
| 108 | def test_tolist(self): |
| 109 | m = self._view(self.base_object) |
| 110 | l = m.tolist() |
| 111 | self.assertEquals(l, list(b"abcdef")) |
| 112 | |
| 113 | def test_compare(self): |
| 114 | # memoryviews can compare for equality with other objects |
| 115 | # having the buffer interface. |
| 116 | m = self._view(self.base_object) |
| 117 | for tp in (bytes, bytearray): |
| 118 | self.assertTrue(m == tp(b"abcdef")) |
| 119 | self.assertFalse(m != tp(b"abcdef")) |
| 120 | self.assertFalse(m == tp(b"abcde")) |
| 121 | self.assertTrue(m != tp(b"abcde")) |
| 122 | self.assertFalse(m == tp(b"abcde1")) |
| 123 | self.assertTrue(m != tp(b"abcde1")) |
| 124 | self.assertTrue(m == m) |
| 125 | self.assertTrue(m == m[:]) |
| 126 | self.assertTrue(m[0:6] == m[:]) |
| 127 | self.assertFalse(m[0:5] == m) |
| 128 | |
| 129 | # Comparison with objects which don't support the buffer API |
| 130 | self.assertFalse(m == "abc") |
| 131 | self.assertTrue(m != "abc") |
| 132 | self.assertFalse("abc" == m) |
| 133 | self.assertTrue("abc" != m) |
| 134 | |
| 135 | # Unordered comparisons |
| 136 | for c in (m, b"abcdef"): |
| 137 | self.assertRaises(TypeError, lambda: m < c) |
| 138 | self.assertRaises(TypeError, lambda: c <= m) |
| 139 | self.assertRaises(TypeError, lambda: m >= c) |
| 140 | self.assertRaises(TypeError, lambda: c > m) |
| 141 | |
| 142 | def check_attributes_with_type(self, tp): |
| 143 | b = tp(self.base_object) |
| 144 | m = self._view(b) |
| 145 | self.assertEquals(m.format, 'B') |
| 146 | self.assertEquals(m.itemsize, 1) |
| 147 | self.assertEquals(m.ndim, 1) |
| 148 | self.assertEquals(m.shape, (6,)) |
| 149 | self.assertEquals(m.size, 6) |
| 150 | self.assertEquals(m.strides, (1,)) |
| 151 | self.assertEquals(m.suboffsets, None) |
| 152 | return m |
| 153 | |
| 154 | def test_attributes_readonly(self): |
| 155 | m = self.check_attributes_with_type(bytes) |
| 156 | self.assertEquals(m.readonly, True) |
| 157 | |
| 158 | def test_attributes_writable(self): |
| 159 | m = self.check_attributes_with_type(bytearray) |
| 160 | self.assertEquals(m.readonly, False) |
| 161 | |
Antoine Pitrou | c6b09eb | 2008-09-01 15:10:14 +0000 | [diff] [blame^] | 162 | def test_getbuffer(self): |
| 163 | # Test PyObject_GetBuffer() on a memoryview object. |
| 164 | b = self.base_object |
| 165 | oldrefcount = sys.getrefcount(b) |
| 166 | m = self._view(b) |
| 167 | oldviewrefcount = sys.getrefcount(m) |
| 168 | s = str(m, "utf-8") |
| 169 | self._check_contents(b, s.encode("utf-8")) |
| 170 | self.assertEquals(sys.getrefcount(m), oldviewrefcount) |
| 171 | m = None |
| 172 | self.assertEquals(sys.getrefcount(b), oldrefcount) |
| 173 | |
| 174 | def test_gc(self): |
| 175 | class MyBytes(bytes): |
| 176 | pass |
| 177 | class MyObject: |
| 178 | pass |
| 179 | |
| 180 | # Create a reference cycle through a memoryview object |
| 181 | b = MyBytes(b'abc') |
| 182 | m = self._view(b) |
| 183 | o = MyObject() |
| 184 | b.m = m |
| 185 | b.o = o |
| 186 | wr = weakref.ref(o) |
| 187 | b = m = o = None |
| 188 | # The cycle must be broken |
| 189 | gc.collect() |
| 190 | self.assert_(wr() is None, wr()) |
| 191 | |
Antoine Pitrou | 616d285 | 2008-08-19 22:09:34 +0000 | [diff] [blame] | 192 | |
| 193 | class MemoryviewTest(unittest.TestCase, CommonMemoryTests): |
| 194 | |
| 195 | def _view(self, obj): |
| 196 | return memoryview(obj) |
| 197 | |
| 198 | def _check_contents(self, obj, contents): |
| 199 | self.assertEquals(obj, contents) |
Christian Heimes | 7b6fc8e | 2007-11-08 02:28:11 +0000 | [diff] [blame] | 200 | |
| 201 | def test_constructor(self): |
| 202 | ob = b'test' |
| 203 | self.assert_(memoryview(ob)) |
| 204 | self.assert_(memoryview(object=ob)) |
| 205 | self.assertRaises(TypeError, memoryview) |
| 206 | self.assertRaises(TypeError, memoryview, ob, ob) |
| 207 | self.assertRaises(TypeError, memoryview, argument=ob) |
| 208 | self.assertRaises(TypeError, memoryview, ob, argument=True) |
| 209 | |
Antoine Pitrou | 616d285 | 2008-08-19 22:09:34 +0000 | [diff] [blame] | 210 | |
| 211 | class MemorySliceTest(unittest.TestCase, CommonMemoryTests): |
| 212 | base_object = b"XabcdefY" |
| 213 | |
| 214 | def _view(self, obj): |
| 215 | m = memoryview(obj) |
| 216 | return m[1:7] |
| 217 | |
| 218 | def _check_contents(self, obj, contents): |
| 219 | self.assertEquals(obj[1:7], contents) |
| 220 | |
| 221 | def test_refs(self): |
| 222 | m = memoryview(b"ab") |
| 223 | oldrefcount = sys.getrefcount(m) |
| 224 | m[1:2] |
| 225 | self.assertEquals(sys.getrefcount(m), oldrefcount) |
| 226 | |
| 227 | |
| 228 | class MemorySliceSliceTest(unittest.TestCase, CommonMemoryTests): |
| 229 | base_object = b"XabcdefY" |
| 230 | |
| 231 | def _view(self, obj): |
| 232 | m = memoryview(obj) |
| 233 | return m[:7][1:] |
| 234 | |
| 235 | def _check_contents(self, obj, contents): |
| 236 | self.assertEquals(obj[1:7], contents) |
| 237 | |
| 238 | |
Christian Heimes | 7b6fc8e | 2007-11-08 02:28:11 +0000 | [diff] [blame] | 239 | def test_main(): |
Antoine Pitrou | 616d285 | 2008-08-19 22:09:34 +0000 | [diff] [blame] | 240 | test.support.run_unittest( |
| 241 | MemoryviewTest, MemorySliceTest, MemorySliceSliceTest) |
Christian Heimes | 7b6fc8e | 2007-11-08 02:28:11 +0000 | [diff] [blame] | 242 | |
| 243 | |
| 244 | if __name__ == "__main__": |
| 245 | test_main() |