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test_event.py

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# -*- coding: utf-8 -*-

"""Test CLR event support."""

import pytest

from Python.Test import EventTest, EventArgsTest

from .utils import (CallableHandler, ClassMethodHandler, GenericHandler,

MultipleHandler, StaticMethodHandler, VarCallableHandler,

VariableArgsHandler)

def test_public_instance_event():

"""Test public instance events."""

ob = EventTest()

handler = GenericHandler()

assert handler.value is None

ob.PublicEvent += handler.handler

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 10

ob.PublicEvent -= handler.handler

def test_public_static_event():

"""Test public static events."""

handler = GenericHandler()

assert handler.value is None

EventTest.PublicStaticEvent += handler.handler

EventTest.OnPublicStaticEvent(EventArgsTest(10))

assert handler.value == 10

def test_protected_instance_event():

"""Test protected instance events."""

ob = EventTest()

handler = GenericHandler()

assert handler.value is None

ob.ProtectedEvent += handler.handler

ob.OnProtectedEvent(EventArgsTest(10))

assert handler.value == 10

ob.ProtectedEvent -= handler.handler

def test_protected_static_event():

"""Test protected static events."""

handler = GenericHandler()

assert handler.value is None

EventTest.ProtectedStaticEvent += handler.handler

EventTest.OnProtectedStaticEvent(EventArgsTest(10))

assert handler.value == 10

EventTest.ProtectedStaticEvent -= handler.handler

def test_internal_events():

"""Test internal events."""

with pytest.raises(AttributeError):

_ = EventTest().InternalEvent

with pytest.raises(AttributeError):

_ = EventTest().InternalStaticEvent

with pytest.raises(AttributeError):

_ = EventTest.InternalStaticEvent

def test_private_events():

"""Test private events."""

with pytest.raises(AttributeError):

_ = EventTest().PrivateEvent

with pytest.raises(AttributeError):

_ = EventTest().PrivateStaticEvent

with pytest.raises(AttributeError):

_ = EventTest.PrivateStaticEvent

def test_multicast_event():

"""Test multicast events."""

ob = EventTest()

handler1 = GenericHandler()

handler2 = GenericHandler()

handler3 = GenericHandler()

ob.PublicEvent += handler1.handler

ob.PublicEvent += handler2.handler

ob.PublicEvent += handler3.handler

ob.OnPublicEvent(EventArgsTest(10))

assert handler1.value == 10

assert handler2.value == 10

assert handler3.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert handler1.value == 20

assert handler2.value == 20

assert handler3.value == 20

ob.PublicEvent -= handler1.handler

ob.PublicEvent -= handler2.handler

ob.PublicEvent -= handler3.handler

def test_instance_method_handler():

"""Test instance method handlers."""

ob = EventTest()

handler = GenericHandler()

ob.PublicEvent += handler.handler

assert handler.value is None

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 10

ob.PublicEvent -= handler.handler

assert handler.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert handler.value == 10

def test_var_args_instance_method_handler():

"""Test vararg instance method handlers."""

ob = EventTest()

handler = VariableArgsHandler()

ob.PublicEvent += handler.handler

assert handler.value is None

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 10

ob.PublicEvent -= handler.handler

assert handler.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert handler.value == 10

def test_callableob_handler():

"""Test callable ob handlers."""

ob = EventTest()

handler = CallableHandler()

ob.PublicEvent += handler

assert handler.value is None

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 10

ob.PublicEvent -= handler

assert handler.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert handler.value == 10

def test_var_args_callable_handler():

"""Test varargs callable handlers."""

ob = EventTest()

handler = VarCallableHandler()

ob.PublicEvent += handler

assert handler.value is None

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 10

ob.PublicEvent -= handler

assert handler.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert handler.value == 10

def test_static_method_handler():

"""Test static method handlers."""

ob = EventTest()

handler = StaticMethodHandler()

StaticMethodHandler.value = None

ob.PublicEvent += handler.handler

assert handler.value is None

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 10

ob.PublicEvent -= handler.handler

assert handler.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert handler.value == 10

def test_class_method_handler():

"""Test class method handlers."""

ob = EventTest()

handler = ClassMethodHandler()

ClassMethodHandler.value = None

ob.PublicEvent += handler.handler

assert handler.value is None

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 10

ob.PublicEvent -= handler.handler

assert handler.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert handler.value == 10

def test_managed_instance_method_handler():

"""Test managed instance method handlers."""

ob = EventTest()

ob.PublicEvent += ob.GenericHandler

assert ob.value == 0

ob.OnPublicEvent(EventArgsTest(10))

assert ob.value == 10

ob.PublicEvent -= ob.GenericHandler

assert ob.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert ob.value == 10

def test_managed_static_method_handler():

"""Test managed static method handlers."""

ob = EventTest()

EventTest.s_value = 0

ob.PublicEvent += ob.StaticHandler

assert EventTest.s_value == 0

ob.OnPublicEvent(EventArgsTest(10))

assert EventTest.s_value == 10

ob.PublicEvent -= ob.StaticHandler

assert EventTest.s_value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert EventTest.s_value == 10

def test_unbound_method_handler():

"""Test failure mode for unbound method handlers."""

ob = EventTest()

ob.PublicEvent += GenericHandler.handler

with pytest.raises(TypeError):

ob.OnPublicEvent(EventArgsTest(10))

ob.PublicEvent -= GenericHandler.handler

def test_function_handler():

"""Test function handlers."""

ob = EventTest()

dict_ = {'value': None}

def handler(sender, args, dict_=dict_):

dict_['value'] = args.value

ob.PublicEvent += handler

assert dict_['value'] is None

ob.OnPublicEvent(EventArgsTest(10))

assert dict_['value'] == 10

ob.PublicEvent -= handler

assert dict_['value'] == 10

ob.OnPublicEvent(EventArgsTest(20))

assert dict_['value'] == 10

def test_out_function_handler():

"""Test function handlers with Out arguments."""

ob = EventTest()

value = 10

def handler(ignored):

return value

ob.OutIntEvent += handler

result = ob.OnOutIntEvent(55)

assert result == value

ob.OutStringEvent += handler

value = 'This is the event data'

result = ob.OnOutStringEvent('Hello')

assert result == value

def test_ref_function_handler():

"""Test function handlers with Ref arguments."""

ob = EventTest()

value = 10

def handler(data):

return value + data

ob.RefIntEvent += ob.RefIntHandler

ob.RefIntEvent += handler

result = ob.OnRefIntEvent(5)

assert result == value + 5 + 1

ob.RefStringEvent += ob.RefStringHandler

ob.RefStringEvent += handler

value = 'This is the event data'

result = ob.OnRefStringEvent('!')

assert result == value + '!!'

def test_add_non_callable_handler():

"""Test handling of attempts to add non-callable handlers."""

with pytest.raises(TypeError):

ob = EventTest()

ob.PublicEvent += 10

with pytest.raises(TypeError):

ob = EventTest()

ob.PublicEvent += "spam"

with pytest.raises(TypeError):

class Spam(object):

pass

ob = EventTest()

ob.PublicEvent += Spam()

def test_remove_multiple_handlers():

"""Test removing multiple instances of the same handler."""

ob = EventTest()

handler = MultipleHandler()

h1 = handler.handler

ob.PublicEvent += h1

h2 = handler.handler

ob.PublicEvent += h2

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 20

ob.PublicEvent -= h1

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 30

ob.PublicEvent -= h2

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 30

# try again, removing in a different order.

ob = EventTest()

handler = MultipleHandler()

h1 = handler.handler

ob.PublicEvent += h1

h2 = handler.handler

ob.PublicEvent += h2

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 20

ob.PublicEvent -= h2

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 30

ob.PublicEvent -= h1

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 30

def test_remove_multiple_static_handlers():

"""Test removing multiple instances of a static handler."""

ob = EventTest()

handler = MultipleHandler()

h1 = handler.handler

ob.PublicStaticEvent += h1

h2 = handler.handler

ob.PublicStaticEvent += h2

ob.OnPublicStaticEvent(EventArgsTest(10))

assert handler.value == 20

ob.PublicStaticEvent -= h1

ob.OnPublicStaticEvent(EventArgsTest(10))

assert handler.value == 30

ob.PublicStaticEvent -= h2

ob.OnPublicStaticEvent(EventArgsTest(10))

assert handler.value == 30

# try again, removing in a different order.

ob = EventTest()

handler = MultipleHandler()

h1 = handler.handler

ob.PublicStaticEvent += h1

h2 = handler.handler

ob.PublicStaticEvent += h2

ob.OnPublicStaticEvent(EventArgsTest(10))

assert handler.value == 20

ob.PublicStaticEvent -= h2

ob.OnPublicStaticEvent(EventArgsTest(10))

assert handler.value == 30

ob.PublicStaticEvent -= h1

ob.OnPublicStaticEvent(EventArgsTest(10))

assert handler.value == 30

def test_random_multiple_handlers():

"""Test random subscribe / unsubscribe of the same handlers."""

import random

ob = EventTest()

handler = MultipleHandler()

handler2 = MultipleHandler()

ob.PublicEvent += handler2.handler

ob.PublicEvent += handler2.handler

handlers = []

for _ in range(30):

method = handler.handler

ob.PublicEvent += method

handlers.append(method)

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 300

assert handler2.value == 20

handler.value = 0

handler2.value = 0

for i in range(30):

item = random.choice(handlers)

handlers.remove(item)

ob.PublicEvent -= item

handler.value = 0

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == (len(handlers) * 10)

assert handler2.value == ((i + 1) * 20)

handler2.value = 0

ob.OnPublicEvent(EventArgsTest(10))

assert handler2.value == 20

ob.PublicEvent -= handler2.handler

handler2.value = 0

ob.OnPublicEvent(EventArgsTest(10))

assert handler2.value == 10

ob.PublicEvent -= handler2.handler

handler2.value = 0

ob.OnPublicEvent(EventArgsTest(10))

assert handler2.value == 0

def test_remove_internal_call_handler():

"""Test remove on an event sink implemented w/internalcall."""

ob = EventTest()

def h(sender, args):

pass

ob.PublicEvent += h

ob.PublicEvent -= h

def test_remove_unknown_handler():

"""Test removing an event handler that was never added."""

with pytest.raises(ValueError):

ob = EventTest()

handler = GenericHandler()

ob.PublicEvent -= handler.handler

def test_handler_callback_failure():

"""Test failure mode for inappropriate handlers."""

class BadHandler(object):

def handler(self, one):

return 'too many'

ob = EventTest()

handler = BadHandler()

with pytest.raises(TypeError):

ob.PublicEvent += handler.handler

ob.OnPublicEvent(EventArgsTest(10))

ob.PublicEvent -= handler.handler

class BadHandler(object):

def handler(self, one, two, three, four, five):

return 'not enough'

ob = EventTest()

handler = BadHandler()

with pytest.raises(TypeError):

ob.PublicEvent += handler.handler

ob.OnPublicEvent(EventArgsTest(10))

ob.PublicEvent -= handler.handler

def test_incorrect_invokation():

"""Test incorrect invocation of events."""

ob = EventTest()

handler = GenericHandler()

ob.PublicEvent += handler.handler

with pytest.raises(TypeError):

ob.OnPublicEvent()

with pytest.raises(TypeError):

ob.OnPublicEvent(32)

ob.PublicEvent -= handler.handler

def test_explicit_cls_event_registration():

"""Test explicit CLS event registration."""

from Python.Test import EventHandlerTest

ob = EventTest()

handler = GenericHandler()

delegate = EventHandlerTest(handler.handler)

ob.add_PublicEvent(delegate)

assert handler.value is None

ob.OnPublicEvent(EventArgsTest(10))

assert handler.value == 10

ob.remove_PublicEvent(delegate)

assert handler.value == 10

ob.OnPublicEvent(EventArgsTest(20))

assert handler.value == 10

def test_implicit_cls_event_registration():

"""Test implicit CLS event registration."""

with pytest.raises(TypeError):

ob = EventTest()

handler = GenericHandler()

ob.add_PublicEvent(handler.handler)

def test_event_descriptor_abuse():

"""Test event descriptor abuse."""

with pytest.raises(TypeError):

del EventTest.PublicEvent

with pytest.raises(TypeError):

del EventTest.__dict__['PublicEvent']

desc = EventTest.__dict__['PublicEvent']

with pytest.raises(TypeError):

desc.__get__(0, 0)

with pytest.raises(TypeError):

desc.__set__(0, 0)

with pytest.raises(TypeError):

ob = EventTest()

ob.PublicEvent = 0

with pytest.raises(TypeError):

EventTest.PublicStaticEvent = 0