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""" Tests for class load hooks. """
# Standard library imports.
import sys, unittest
# Enthought library imports.
from enthought.envisage.api import ClassLoadHook
from enthought.traits.api import HasTraits
# This module's package.
PKG = 'enthought.envisage.tests'
class ClassLoadHookTestCase(unittest.TestCase):
""" Tests for class load hooks. """
###########################################################################
# 'TestCase' interface.
###########################################################################
def setUp(self):
""" Prepares the test fixture before each test method is called. """
return
def tearDown(self):
""" Called immediately after each test method has been called. """
return
###########################################################################
# Tests.
###########################################################################
def test_connect(self):
""" connect """
def on_class_loaded(cls):
""" Called when a class is loaded. """
on_class_loaded.cls = cls
return
# To register with 'MetaHasTraits' we use 'module_name.class_name'.
hook = ClassLoadHook(
class_name = ClassLoadHookTestCase.__module__ + '.Foo',
on_load = on_class_loaded
)
hook.connect()
class Foo(HasTraits):
pass
self.assertEqual(Foo, on_class_loaded.cls)
return
def test_class_already_loaded(self):
""" class already loaded """
def on_class_loaded(cls):
""" Called when a class is loaded. """
on_class_loaded.cls = cls
return
# To register with 'MetaHasTraits' we use 'module_name.class_name'.
hook = ClassLoadHook(
class_name = self._get_full_class_name(ClassLoadHookTestCase),
on_load = on_class_loaded
)
hook.connect()
# Make sure the 'on_load' got called immediately because the class is
# already loaded.
self.assertEqual(ClassLoadHookTestCase, on_class_loaded.cls)
return
def test_disconnect(self):
""" disconnect """
def on_class_loaded(cls):
""" Called when a class is loaded. """
on_class_loaded.cls = cls
return
# To register with 'MetaHasTraits' we use 'module_name.class_name'.
hook = ClassLoadHook(
class_name = ClassLoadHookTestCase.__module__ + '.Foo',
on_load = on_class_loaded
)
hook.connect()
class Foo(HasTraits):
pass
self.assertEqual(Foo, on_class_loaded.cls)
# 'Reset' the listener,
on_class_loaded.cls = None
# Now disconnect.
hook.disconnect()
class Foo(HasTraits):
pass
self.assertEqual(None, on_class_loaded.cls)
return
###########################################################################
# Private interface.
###########################################################################
def _get_full_class_name(self, cls):
""" Return the full (possibly) dotted name of a class. """
return cls.__module__ + '.' + cls.__name__
# Entry point for stand-alone testing.
if __name__ == '__main__':
unittest.main()
#### EOF ######################################################################
|
