def test_register_listener(self):
"""
Registering and deregistering signal listeners
Verifies:
* only specified functions are added
* removing the last function for a signal removes the signal
"""
manager = ModuleManager()
module = Foo()
manager.register_listener("SIGNAL", module.foo)
manager.register_listener("SIGNAL", module.bar)
manager.register_listener("SIGNAL2", module.xoo)
self.assert_("SIGNAL" in manager._listeners)
self.assert_(module.foo in manager._listeners["SIGNAL"])
self.assert_(module.bar in manager._listeners["SIGNAL"])
self.assert_("SIGNAL2" in manager._listeners)
self.assert_(module.xoo in manager._listeners["SIGNAL2"])
manager.deregister_listener("SIGNAL", module.foo)
self.assert_("SIGNAL" in manager._listeners)
self.assert_(module.bar in manager._listeners["SIGNAL"])
self.assert_("SIGNAL2" in manager._listeners)
self.assert_(module.xoo in manager._listeners["SIGNAL2"])
manager.deregister_listener("SIGNAL", module.bar)
manager.deregister_listener("SIGNAL2", module.xoo)
self.assertFalse("SIGNAL" in manager._listeners, "signal should be removed when no listeners")
self.assertFalse("SIGNAL2" in manager._listeners, "signal should be removed when no listeners")
