[integration tests] some neutron tests fail on fixture setup with StopIteration

[Georgy Dyuldin]

Test result:

https://mirantis.testrail.com/index.php?/tests/view/5881515

Exception:

Test setup failure

Trace:

self = <CallInfo when='setup' exception: >
func = <function <lambda> at 0x7f9e5e2b8668>, when = 'setup'

    def __init__(self, func, when):
        #: context of invocation: one of "setup", "call",
        #: "teardown", "memocollect"
        self.when = when
        self.start = time()
        try:
> self.result = func()

tests/local/lib/python2.7/site-packages/_pytest/runner.py:150:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/local/lib/python2.7/site-packages/_pytest/runner.py:138: in <lambda>
    return CallInfo(lambda: ihook(item=item, **kwds), when=when)
tests/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py:724: in __call__
    return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
tests/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py:338: in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
tests/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py:333: in <lambda>
    _MultiCall(methods, kwargs, hook.spec_opts).execute()
tests/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py:595: in execute
    return _wrapped_call(hook_impl.function(*args), self.execute)
tests/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py:253: in _wrapped_call
    return call_outcome.get_result()
tests/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py:279: in get_result
    _reraise(*ex) # noqa
tests/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py:264: in __init__
    self.result = func()
tests/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py:596: in execute
    res = hook_impl.function(*args)
tests/local/lib/python2.7/site-packages/_pytest/runner.py:87: in pytest_runtest_setup
    item.session._setupstate.prepare(item)
tests/local/lib/python2.7/site-packages/_pytest/runner.py:408: in prepare
    col.setup()
tests/local/lib/python2.7/site-packages/_pytest/python.py:1421: in setup
    fillfixtures(self)
tests/local/lib/python2.7/site-packages/_pytest/python.py:819: in fillfixtures
    request._fillfixtures()
tests/local/lib/python2.7/site-packages/_pytest/python.py:1569: in _fillfixtures
    item.funcargs[argname] = self.getfuncargvalue(argname)
tests/local/lib/python2.7/site-packages/_pytest/python.py:1612: in getfuncargvalue
    return self._get_active_fixturedef(argname).cached_result[0]
tests/local/lib/python2.7/site-packages/_pytest/python.py:1629: in _get_active_fixturedef
    result = self._getfuncargvalue(fixturedef)
tests/local/lib/python2.7/site-packages/_pytest/python.py:1675: in _getfuncargvalue
    val = fixturedef.execute(request=subrequest)
tests/local/lib/python2.7/site-packages/_pytest/python.py:2137: in execute
    self.yieldctx)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

fixturefunc = <bound method ?.set_debug_logging_for_neutron_l3_agent of <mos_tests.neutron.python_tests.test_dvr.TestDVRRegression object at 0x7f9e5e63c310>>
request = <SubRequest 'set_debug_logging_for_neutron_l3_agent' for <Function 'test_check_router_update_notification_for_l3_agents[(851673)]'>>
kwargs = {'os_conn': <mos_tests.environment.os_actions.OpenStackActions object at 0x7f9e5e641390>}
yieldctx = True

    def call_fixture_func(fixturefunc, request, kwargs, yieldctx):
        if yieldctx:
            if not is_generator(fixturefunc):
                fail_fixturefunc(fixturefunc,
                    msg="yield_fixture requires yield statement in function")
            iter = fixturefunc(**kwargs)
            next = getattr(iter, "__next__", None)
            if next is None:
                next = getattr(iter, "next")
> res = next()
E StopIteration

tests/local/lib/python2.7/site-packages/_pytest/python.py:2042: StopIteration

Reason:

https://github.com/Mirantis/mos-integration-tests/blob/master/mos_tests/neutron/python_tests/test_dvr.py#L1255 - if condition is false, there is no yield in fixture