49 lines
1.3 KiB
Python
49 lines
1.3 KiB
Python
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import pytest
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from util.failover import failover, FailoverException
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class FinishedException(Exception):
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""" Exception raised at the end of every iteration to force failover. """
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class Counter(object):
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""" Wraps a counter in an object so that it'll be passed by reference. """
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def __init__(self):
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self.calls = 0
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def increment(self):
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self.calls += 1
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@failover
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def my_failover_func(i, should_raise=None):
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""" Increments a counter and raises an exception when told. """
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i.increment()
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if should_raise is not None:
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raise should_raise()
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raise FailoverException(FinishedException())
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@pytest.mark.parametrize('stop_on,exception', [
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(10, None),
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(5, IndexError),
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])
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def test_readonly_failover(stop_on, exception):
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""" Generates failover arguments and checks against a counter to ensure that
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the failover function has been called the proper amount of times and stops
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at unhandled exceptions.
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"""
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counter = Counter()
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arg_sets = []
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for i in xrange(stop_on):
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should_raise = exception if exception is not None and i == stop_on-1 else None
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arg_sets.append(((counter,), {'should_raise': should_raise}))
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if exception is not None:
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with pytest.raises(exception):
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my_failover_func(*arg_sets)
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else:
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with pytest.raises(FinishedException):
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my_failover_func(*arg_sets)
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assert counter.calls == stop_on
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