Run controllers on their own threads over the bus

test/RuntimeSpec.hs

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+{-# LANGUAGE OverloadedStrings #-}
+module RuntimeSpec (spec) where
+
+import Control.Concurrent (threadDelay)
+import Control.Concurrent.Async (async)
+import Control.Concurrent.STM (atomically, readTChan, writeTChan)
+import Data.Aeson (Value, object, (.=))
+import Data.Text (Text)
+import HomeAssistant.Controller (light, lightController)
+import HomeAssistant.Runtime (Controller (..), runController)
+import HomeAssistant.Runtime.Bus
+import Test.Hspec
+
+spec :: Spec
+spec = describe "runController" $ do
+  it "feeds inbound events through the machine and forwards service calls" $ do
+    bus <- newBus 0
+    _ <- async (runController bus (Controller "test" lightController))
+    threadDelay 100000 -- let the controller dup its inbound channel
+    atomically $ writeTChan (busInbound bus) (doorEvent "on")  -- initial value: no change event
+    atomically $ writeTChan (busInbound bus) (doorEvent "off") -- door closes: lights on
+    atomically $ writeTChan (busInbound bus) (doorEvent "on")  -- door opens: lights off
+    svc1 <- atomically (readTChan (busOutbound bus))
+    svc2 <- atomically (readTChan (busOutbound bus))
+    svc1 `shouldBe` light True
+    svc2 `shouldBe` light False
+
+doorEvent :: Text -> Value
+doorEvent state = object
+  [ "event" .= object
+    [ "data" .= object
+      [ "entity_id" .= ("binary_sensor.makuuhuone_ovi_contact" :: Text)
+      , "new_state" .= object ["state" .= state]
+      ]
+    ]
+  ]