/usr/lib/python2.7/dist-packages/traits/tests/test_dynamic_trait_definition.py is in python-traits 4.6.0-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | from traits.testing.unittest_tools import unittest
from traits.api import Float, HasTraits, Int, List
class Foo(HasTraits):
x = Float
y_changes = List
def _y_changed(self, new):
self.y_changes.append(new)
class TestDynamicTraitDefinition(unittest.TestCase):
""" Test demonstrating special change events using the 'event' metadata.
"""
def test_add_trait(self):
foo = Foo(x=3)
foo.add_trait('y', Int)
self.assertTrue(hasattr(foo, 'y'))
self.assertEqual(type(foo.y), int)
foo.y = 4
self.assertEqual(foo.y_changes, [4])
def test_remove_trait(self):
foo = Foo(x=3)
# We can't remove a "statically" added trait (i.e., a trait defined
# in the Foo class).
result = foo.remove_trait('x')
self.assertFalse(result)
# We can remove dynamically added traits.
foo.add_trait('y', Int)
foo.y = 70
result = foo.remove_trait('y')
self.assertTrue(result)
self.assertFalse(hasattr(foo, 'y'))
foo.y = 10
self.assertEqual(foo.y_changes, [70])
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