Improve testing harness to allow tests on real devices (#197)

* test_cli: provide return values to patched objects to avoid warning about non-awaited calls

* test_cli: restore alias after testing

* smartstrip: remove internal update() calls for turn_{on,off}, set_led

* Make sure power is always a float

* Fix discovery tests

* Make tests runnable on real devices

* Add a note about running tests on a real device

* test_strip: run update against the parent device

kasa/smartstrip.py

@@ -100,12 +100,10 @@ class SmartStrip(SmartDevice):
     async def turn_on(self, **kwargs):
         """Turn the strip on."""
         await self._query_helper("system", "set_relay_state", {"state": 1})
-        await self.update()
 
     async def turn_off(self, **kwargs):
         """Turn the strip off."""
         await self._query_helper("system", "set_relay_state", {"state": 0})
-        await self.update()
 
     @property  # type: ignore
     @requires_update
@@ -126,7 +124,6 @@ class SmartStrip(SmartDevice):
     async def set_led(self, state: bool):
         """Set the state of the led (night mode)."""
         await self._query_helper("system", "set_led_off", {"off": int(not state)})
-        await self.update()
 
     @property  # type: ignore
     @requires_update