Fix failing tests: KeyError: 'relay_state'

[basnijholt]

In the CI's build log I see:

2019-12-18T08:07:23.5192675Z 
2019-12-18T08:07:23.5192766Z =================================== FAILURES ===================================
2019-12-18T08:07:23.5192838Z _ test_state_info[/home/vsts/work/1/s/kasa/tests/fixtures/HS300(US)_1.0.json] __
2019-12-18T08:07:23.5193293Z 
2019-12-18T08:07:23.5194008Z dev = <[KeyError('relay_state') raised in repr()] SmartStrip object at 0x7f5dd51ed290>
2019-12-18T08:07:23.5194070Z 
2019-12-18T08:07:23.5194611Z     def test_state_info(dev):
2019-12-18T08:07:23.5194668Z         dev.sync.update()
2019-12-18T08:07:23.5194738Z >       assert isinstance(dev.sync.state_information, dict)
2019-12-18T08:07:23.5194781Z 
2019-12-18T08:07:23.5194830Z kasa/tests/test_fixtures.py:59: 
2019-12-18T08:07:23.5194904Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2019-12-18T08:07:23.5194968Z kasa/smartdevice.py:674: in __getattr__
2019-12-18T08:07:23.5195381Z     method = getattr(self.async_device, attr)
2019-12-18T08:07:23.5195440Z kasa/smartdevice.py:98: in wrapped
2019-12-18T08:07:23.5195599Z     return f(*args, **kwargs)
2019-12-18T08:07:23.5195668Z kasa/smartstrip.py:120: in state_information
2019-12-18T08:07:23.5195725Z     if plug.is_on:
2019-12-18T08:07:23.5195786Z kasa/smartdevice.py:98: in wrapped
2019-12-18T08:07:23.5195842Z     return f(*args, **kwargs)
2019-12-18T08:07:23.5195906Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2019-12-18T08:07:23.5195959Z 
2019-12-18T08:07:23.5198186Z self = <[KeyError('relay_state') raised in repr()] SmartPlug object at 0x7f5dd51ed1d0>
2019-12-18T08:07:23.5198257Z 
2019-12-18T08:07:23.5198322Z     @property  # type: ignore
2019-12-18T08:07:23.5198369Z     @requires_update
2019-12-18T08:07:23.5198606Z     def is_on(self) -> bool:
2019-12-18T08:07:23.5198660Z         """Return whether device is on.
2019-12-18T08:07:23.5198707Z     
2019-12-18T08:07:23.5198775Z         :return: True if device is on, False otherwise
2019-12-18T08:07:23.5198825Z         """
2019-12-18T08:07:23.5198883Z         sys_info = self.sys_info
2019-12-18T08:07:23.5198933Z >       return bool(sys_info["relay_state"])
2019-12-18T08:07:23.5199132Z E       KeyError: 'relay_state'

@rytilahti, this was after you simplified the socket strip. Do you perhaps know why this happens?

[rytilahti]

According to the dummy fixture, HS300 does not have a relay state (https://github.com/python-kasa/python-kasa/blob/master/kasa/tests/fixtures/HS300(US)_1.0.json), I'm not really sure if that's really the case as the strip has set_relay_state (https://github.com/python-kasa/python-kasa/blob/master/kasa/smartstrip.py#L93).

It could just be that this was not implemented in https://github.com/plasticrake/tplink-smarthome-simulator which I used to generate those files, so I'm hoping someone with HS300 will deliver us a devinfo dump from a real device. For the time being we could simply skip that test with a warning for strip devices.

[rytilahti]

This was fixed with #14.