Fix for opsdroid 0.20+ compatibility (#21)

* Fix for opsdroid 0.20+ compatibility

* Fix unit tests for opsdroid 0.20+ compatibility

* Run black

* Opsdroid 0.20 dropped support for Python 3.6

.travis.yml

@@ -14,7 +14,6 @@ after_success: codecov
 jobs:
   fast_finish: true
   include:
-    - python: "3.6"
     - python: "3.7"
     - python: "3.8"
     - stage: deploy

opsdroid_homeassistant/skill/__init__.py

@@ -41,11 +41,18 @@ async def lights_on_at_sunset(self, event):
 
     def __init__(self, opsdroid, config, *args, **kwargs):
         super().__init__(opsdroid, config, *args, **kwargs)
-        [self.hass] = [
-            connector
-            for connector in self.opsdroid.connectors
-            if connector.name == "homeassistant"
-        ]
+        self._hass = None
+
+    @property
+    def hass(self):
+        if self._hass is None:
+            # create lazily (opsdroid.connectors not yet known when __init__ called)
+            [self._hass] = [
+                connector
+                for connector in self.opsdroid.connectors
+                if connector.name == "homeassistant"
+            ]
+        return self._hass
 
     async def call_service(self, domain: str, service: str, *args, **kwargs):
         """Send a service call to Home Assistant.

opsdroid_homeassistant/tests/conftest.py

@@ -70,8 +70,10 @@ async def opsdroid(connector_config, mock_skill_path):
     configure_lang({})
     with OpsDroid(config) as opsdroid:
         await opsdroid.load()
+        await opsdroid.start_connectors()
         await sleep(0.1)  # Give the startup tasks some room to breathe
         yield opsdroid
+        await opsdroid.stop()
         await opsdroid.unload()