X-Git-Url: http://git.lukelau.me/?a=blobdiff_plain;f=src%2FLanguage%2FHaskell%2FLSP%2FTest%2FExceptions.hs;h=e9c65f9598711b89963884e5207488e471655548;hb=bd6901688e6c9d8332fea161260d32666885f9ed;hp=deea111f3e43006ce8084653b6e287b489950048;hpb=0f8b9d328f4d950ff0a2e1c3b5aed593b21c2d3a;p=lsp-test.git

diff --git a/src/Language/Haskell/LSP/Test/Exceptions.hs b/src/Language/Haskell/LSP/Test/Exceptions.hs
index deea111..e9c65f9 100644
--- a/src/Language/Haskell/LSP/Test/Exceptions.hs
+++ b/src/Language/Haskell/LSP/Test/Exceptions.hs
@@ -1,10 +1,24 @@
 module Language.Haskell.LSP.Test.Exceptions where
 
 import Control.Exception
+import Language.Haskell.LSP.Messages
 
 data SessionException = TimeoutException
-  deriving Show
+                      | UnexpectedMessageException String FromServerMessage
+                      | ReplayOutOfOrderException FromServerMessage [FromServerMessage]
+
 instance Exception SessionException
 
+instance Show SessionException where
+  show TimeoutException = "Timed out waiting to receive a message from the server."
+  show (UnexpectedMessageException expected lastMsg) =
+    "Received an unexpected message from the server:\n" ++
+    "Expected: " ++ expected ++ "\n" ++
+    "Last message accepted: " ++ show lastMsg
+  show (ReplayOutOfOrderException received expected) =
+    "Replay is out of order:\n" ++
+    "Received from server:" ++ show received ++ "\n" ++
+    "Expected one of: " ++ concatMap show expected
+
 anySessionException :: SessionException -> Bool
 anySessionException = const True
\ No newline at end of file