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from backcall import callback_prototype
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import unittest
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from unittest.mock import Mock
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import nose.tools as nt
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from IPython.core import events
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import IPython.testing.tools as tt
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@events._define_event
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def ping_received():
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pass
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@events._define_event
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def event_with_argument(argument):
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pass
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class CallbackTests(unittest.TestCase):
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def setUp(self):
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self.em = events.EventManager(get_ipython(),
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{'ping_received': ping_received,
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'event_with_argument': event_with_argument})
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def test_register_unregister(self):
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cb = Mock()
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self.em.register('ping_received', cb)
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self.em.trigger('ping_received')
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self.assertEqual(cb.call_count, 1)
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self.em.unregister('ping_received', cb)
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self.em.trigger('ping_received')
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self.assertEqual(cb.call_count, 1)
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def test_bare_function_missed_unregister(self):
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def cb1():
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...
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def cb2():
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...
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self.em.register('ping_received', cb1)
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nt.assert_raises(ValueError, self.em.unregister, 'ping_received', cb2)
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self.em.unregister('ping_received', cb1)
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def test_cb_error(self):
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cb = Mock(side_effect=ValueError)
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self.em.register('ping_received', cb)
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with tt.AssertPrints("Error in callback"):
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self.em.trigger('ping_received')
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def test_cb_keyboard_interrupt(self):
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cb = Mock(side_effect=KeyboardInterrupt)
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self.em.register('ping_received', cb)
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with tt.AssertPrints("Error in callback"):
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self.em.trigger('ping_received')
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def test_unregister_during_callback(self):
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invoked = [False] * 3
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def func1(*_):
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invoked[0] = True
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self.em.unregister('ping_received', func1)
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self.em.register('ping_received', func3)
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def func2(*_):
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invoked[1] = True
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self.em.unregister('ping_received', func2)
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def func3(*_):
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invoked[2] = True
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self.em.register('ping_received', func1)
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self.em.register('ping_received', func2)
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self.em.trigger('ping_received')
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self.assertEqual([True, True, False], invoked)
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self.assertEqual([func3], self.em.callbacks['ping_received'])
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def test_ignore_event_arguments_if_no_argument_required(self):
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call_count = [0]
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def event_with_no_argument():
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call_count[0] += 1
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self.em.register('event_with_argument', event_with_no_argument)
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self.em.trigger('event_with_argument', 'the argument')
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self.assertEqual(call_count[0], 1)
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self.em.unregister('event_with_argument', event_with_no_argument)
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self.em.trigger('ping_received')
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self.assertEqual(call_count[0], 1)
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