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")
def test_emit(self):
"""
Tests signals
Verifies:
* emitting registered signal calls mapped functions
* emitting unregistered signal doesn't raise an exception
"""
manager = ModuleManager()
module0 = Foo()
module1 = Xoo()
manager.register_listener("FOO", module0.foo)
manager.register_listener("FOO", module1.foo)
manager.register_listener("BAR", module0.bar)
args = (1, 2, 3)
kwargs = {"a": 1, "b": 2}
manager.emit_signal("FOO")
manager.emit_signal("BAR", *args, **kwargs)
module0.foo.assertCalled(self)
module1.foo.assertCalled(self)
module0.bar.assertCalled(self, *args, **kwargs)
