Add the initial Catch testing framework for StackSet

tests/Catch.hs

@@ -0,0 +1,60 @@
+
+-- This is a test set for running with Catch
+-- http://www-users.cs.york.ac.uk/~ndm/catch/
+
+module Catch where
+
+import StackSet
+
+---------------------------------------------------------------------
+-- TESTING PROPERTIES
+
+main = 
+    screen ||| peekStack ||| index ||| empty ||| peek ||| push ||| delete ||| member |||
+    raiseFocus ||| rotate ||| promote ||| shift ||| view ||| workspace ||| insert |||
+    visibleWorkspaces ||| swap {- helper -}
+
+
+---------------------------------------------------------------------
+-- CATCH FIRST-ORDER LIBRARY
+
+-- this should be included with Catch by default
+-- and will be (one day!)
+
+foreign import primitive any0 :: a
+foreign import primitive anyEval1 :: a -> b
+foreign import primitive anyEval2 :: a -> b -> c
+foreign import primitive anyEval3 :: a -> b -> c -> d
+
+
+class Test a where
+    test :: a -> Bool
+
+
+instance Test b => Test (a -> b) where
+    test f = test (f any0)
+
+instance Test (Maybe a) where
+    test f = anyEval1 f
+
+instance Test [a] where
+    test f = anyEval1 f
+
+instance Test (StackSet a b c) where
+    test f = anyEval1 f
+
+instance Test (a,b) where
+    test f = anyEval1 f
+
+instance Test Bool where
+    test f = anyEval1 f
+
+instance Test Char where
+    test f = anyEval1 f
+
+instance Test (IO a) where
+    test f = anyEval1 (f >> return ())
+    
+
+(|||) :: (Test a, Test b) => a -> b -> IO c
+(|||) l r = anyEval2 (test l) (test r)