Unit tests for deletion of property traits.

traits/tests/test_property_delete.py

@@ -0,0 +1,31 @@
+"""
+Unit tests to ensure that we can call reset_traits/delete on a
+property trait (regression tests for Github issue #67).
+
+"""
+
+from traits import _py2to3
+from traits.api import Any, HasTraits, Int, Property, TraitError
+from traits.testing.unittest_tools import unittest
+
+
+class E(HasTraits):
+
+    a = Property(Any)
+
+    b = Property(Int)
+
+
+class TestPropertyDelete(unittest.TestCase):
+
+    def test_property_delete(self):
+        e = E()
+        with self.assertRaises(TraitError):
+            del e.a
+        with self.assertRaises(TraitError):
+            del e.b
+
+    def test_property_reset_traits(self):
+        e = E()
+        unresetable = e.reset_traits()
+        _py2to3.assertCountEqual(self, unresetable, ['a', 'b'])