def assertTraitChangesInEventLoop(self,
obj,
trait,
condition,
count=1,
timeout=10.0):
"""Runs the real Qt event loop, collecting trait change events until
the provided condition evaluates to True.
Parameters
----------
obj : HasTraits
The HasTraits instance whose trait will change.
trait : str
The extended trait name of trait changes to listen too.
condition : callable
A callable to determine if the stop criteria have been met. This
should accept no arguments.
count : int
The expected number of times the event should be fired. The default
is to expect one event.
timeout : float
Number of seconds to run the event loop in the case that the trait
change does not occur.
"""
condition_ = lambda: condition(obj)
collector = TraitsChangeCollector(obj=obj, trait=trait)
collector.start_collecting()
try:
try:
yield collector
self.event_loop_helper.event_loop_until_condition(
condition_, timeout=timeout)
except ConditionTimeoutError:
actual_event_count = collector.event_count
msg = ("Expected {} event on {} to be fired at least {} "
"times, but the event was only fired {} times "
"before timeout ({} seconds).")
msg = msg.format(trait, obj, count, actual_event_count,
timeout)
self.fail(msg)
finally:
collector.stop_collecting()
def assertTraitChangesInEventLoop(self, obj, trait, condition, count=1,
timeout=10.0):
"""Runs the real Qt event loop, collecting trait change events until
the provided condition evaluates to True.
Parameters
----------
obj : HasTraits
The HasTraits instance whose trait will change.
trait : str
The extended trait name of trait changes to listen too.
condition : callable
A callable to determine if the stop criteria have been met. This
should accept no arguments.
count : int
The expected number of times the event should be fired. The default
is to expect one event.
timeout : float
Number of seconds to run the event loop in the case that the trait
change does not occur.
"""
condition_ = lambda: condition(obj)
collector = TraitsChangeCollector(obj=obj, trait=trait)
collector.start_collecting()
try:
try:
yield collector
self.event_loop_helper.event_loop_until_condition(
condition_, timeout=timeout)
except ConditionTimeoutError:
actual_event_count = collector.event_count
msg = ("Expected {} event on {} to be fired at least {} "
"times, but the event was only fired {} times "
"before timeout ({} seconds).")
msg = msg.format(
trait, obj, count, actual_event_count, timeout)
self.fail(msg)
finally:
collector.stop_collecting()