1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeApplications #-}
{-| Tests for error handling.
-}
module HsLua.Core.ErrorTests (tests) where
import Control.Applicative ((<|>), empty)
import Control.Exception
import Data.ByteString (ByteString)
import Data.Typeable (Typeable)
import Data.Either (isLeft)
import HsLua.Core (Lua, failLua)
import HsLua.Core.Error ( LuaError, changeErrorType, popErrorMessage
, throwTypeMismatchError)
import HsLua.Core.Types (liftLua)
import Test.Tasty.HsLua ( (=:), (?:), shouldBeResultOf, shouldHoldForResultOf
, shouldBeErrorMessageOf)
import Test.Tasty (TestTree, testGroup)
import qualified HsLua.Core as Lua
import qualified HsLua.Core.Utf8 as Utf8
-- | Specifications for Attributes parsing functions.
tests :: TestTree
tests = testGroup "Error"
[ "try catches errors" =:
isLeft `shouldHoldForResultOf` Lua.try
(failLua "test" :: Lua ())
, "second alternative is used when first fails" ?:
((failLua "test" :: Lua Bool) <|> return True)
, "Applicative.empty implementation throws an exception" =:
isLeft `shouldHoldForResultOf` Lua.try (empty :: Lua ())
, testGroup "changeErrorType"
[ "catches error as different type in argument operation" =:
Left (SampleException "message") `shouldBeResultOf`
changeErrorType (Lua.try @SampleException @() $ failLua "message")
, "passes value through on success" =:
Just "plant" `shouldBeResultOf` do
Lua.pushstring "plant"
changeErrorType (Lua.tostring Lua.top)
]
, testGroup "type mismatch"
[ "got string" =:
"number expected, got string" `shouldBeErrorMessageOf` do
Lua.pushstring "moin"
throwTypeMismatchError "number" Lua.top :: Lua ()
, "got unnamed userdata" =:
"number expected, got userdata" `shouldBeErrorMessageOf` do
Lua.newhsuserdatauv () 0
throwTypeMismatchError "number" Lua.top :: Lua ()
, "named userdata" =:
"Bar expected, got Foo" `shouldBeErrorMessageOf` do
Lua.newhsuserdatauv () 0
Lua.newudmetatable "Foo"
Lua.setmetatable (Lua.nth 2)
throwTypeMismatchError "Bar" Lua.top :: Lua ()
, "missing value" =:
"boolean expected, got no value" `shouldBeErrorMessageOf` do
curtop <- Lua.gettop
throwTypeMismatchError "boolean" (curtop + 1) :: Lua ()
]
]
newtype SampleException = SampleException ByteString
deriving (Eq, Typeable, Show)
instance Exception SampleException
instance LuaError SampleException where
popException = SampleException <$> liftLua popErrorMessage
pushException (SampleException msg) = Lua.pushstring msg
luaException = SampleException . Utf8.fromString
|
