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import unittest
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from unittest.mock import Mock
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from IPython.core import events
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import IPython.testing.tools as tt
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def ping_received():
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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(), {'ping_received': ping_received})
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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_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_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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