[svn r37264] create the new development trunk

--HG--
branch : trunk

py/magic/testing/test_patch.py

@@ -0,0 +1,31 @@
+from py.test import raises
+from py.magic import patch, revert
+
+def test_patch_revert():
+    class a:
+        pass
+    raises(AttributeError, "patch(a, 'i', 42)")
+
+    a.i = 42
+    patch(a, 'i', 23)
+    assert a.i == 23
+    revert(a, 'i')
+    assert a.i == 42
+
+def test_double_patch():
+    class a:
+        i = 42
+    assert patch(a, 'i', 2) == 42
+    assert patch(a, 'i', 3) == 2
+    assert a.i == 3
+    assert revert(a, 'i') == 3
+    assert a.i == 2
+    assert revert(a, 'i') == 2
+    assert a.i == 42
+
+def test_valueerror():
+    class a:
+        i = 2
+        pass
+    raises(ValueError, "revert(a, 'i')")
+