fix(runtime): make single threaded execution of tests work

src/runtime-prototype/src/StuntDouble/ActorMap.hs

@@ -452,7 +452,7 @@ makeEventLoop time seed tk name = do
          Http port    -> httpTransport port
          Stm          -> stmTransport
   ls <- initLoopState name time seed t
-  pids <- if True -- XXX: introduce and parametrise by flag
+  pids <- if False -- XXX: introduce and parametrise by flag
           then do
             aInHandler <- async (handleInbound ls)
             aAsyncIOHandler <- async (handleAsyncIO ls)

src/runtime-prototype/src/StuntDouble/Transport/NamedPipe.hs

@@ -1,15 +1,16 @@
 module StuntDouble.Transport.NamedPipe where
 
-import Control.Exception
 import Control.Concurrent.Async
+import Control.Exception
+import System.FilePath
 import System.IO
 import System.IO.Error
 import System.Posix.Files
-import System.FilePath
+import System.Timeout
 
-import StuntDouble.Reference
-import StuntDouble.Message
 import StuntDouble.Envelope
+import StuntDouble.Message
+import StuntDouble.Reference
 import StuntDouble.Transport
 
 ------------------------------------------------------------------------
@@ -40,12 +41,4 @@ safeCreateNamedPipe fp =
     return
 
 hMaybeGetLine :: Handle -> IO (Maybe String)
-hMaybeGetLine h = do
-  eof <- hIsEOF h
-  if eof
-  then return Nothing
-  else do
-    rdy <- hReady h
-    if rdy
-    then fmap Just (hGetLine h)
-    else return Nothing
+hMaybeGetLine = timeout 1000 . hGetLine

src/runtime-prototype/test/StuntDouble/Transport/NamedPipeTest.hs

@@ -6,11 +6,17 @@ import StuntDouble
 
 ------------------------------------------------------------------------
 
-unit_transportNamedPipe :: IO ()
+unit_transportNamedPipe :: Assertion
 unit_transportNamedPipe = do
-  t <- namedPipeTransport "/tmp" (EventLoopName "a")
+  t <- namedPipeTransport "/tmp" (EventLoopName "transportNamedPipe")
   let e = Envelope RequestKind (RemoteRef "from" 0) (InternalMessage "msg")
-                   (RemoteRef "a" 1) 0
+                   (RemoteRef "transportNamedPipe" 1) 0
   transportSend t e
-  e' <- transportReceive t
-  e' @?= Just e
+  me' <- transportReceive t
+  me' @?= Just e
+
+unit_transportNamedPipeNothing :: Assertion
+unit_transportNamedPipeNothing = do
+  t <- namedPipeTransport "/tmp" (EventLoopName "transportNamedPipeNothing")
+  me <- transportReceive t
+  me @?= Nothing