Increase test coverage for set_schedule_state()

Author: bouwew

tests/test_adam.py

@@ -82,6 +82,12 @@ async def test_connect_adam_plus_anna_new(self):
         # Special test-case for turning a schedule off for a location via the option "off".
         await api.set_schedule_state("f2bf9048bef64cc5b6d5110154e33c81", "off", "on")
 
+        # Special test-case for setting a schedule to an invalid state.
+        with pytest.raises(pw_exceptions.PlugwiseError):
+            await api.set_schedule_state(
+                "f2bf9048bef64cc5b6d5110154e33c81", "Weekschema", "eco"
+            )
+
         # bad schedule-state test
         result = await self.tinker_thermostat_schedule(
             api,