Add Runtime.Connection reader and writer actions

test/Main.hs

@@ -2,6 +2,9 @@ module Main (main) where
 
 import Test.Hspec (hspec)
 import qualified BusSpec
+import qualified ConnectionSpec
 
 main :: IO ()
-main = hspec BusSpec.spec
+main = hspec $ do
+  BusSpec.spec
+  ConnectionSpec.spec