From 4a9ace968e790f91fcd0093e283bdfa2fb6a6328 Mon Sep 17 00:00:00 2001
From: Don Stewart <dons@cse.unsw.edu.au>
Date: Mon, 30 Apr 2007 07:57:51 +0200
Subject: add rotate all and view idempotency tests

darcs-hash:20070430055751-9c5c1-da5da09a5c2ff160fb7b243794d5fd3d7f954cb1
---
 tests/Properties.hs | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/tests/Properties.hs b/tests/Properties.hs
index d8b0a48..b49cbd3 100644
--- a/tests/Properties.hs
+++ b/tests/Properties.hs
@@ -119,8 +119,15 @@ prop_delete2 i x =
 prop_focus1 i x = member i x ==> peek (raiseFocus i x) == Just i
     where _ = x :: T
 
-prop_rotaterotate x   = rotate LT (rotate GT x) == x
-    where _ = x :: T
+-- rotation is reversible in two directions
+prop_rotaterotate1 (x :: T)   = rotate LT (rotate GT x) == x
+prop_rotaterotate2 (x :: T)   = rotate GT (rotate LT x) == x
+
+-- rotation through the height of a stack gets us back to the start
+prop_rotate_all (x :: T) = foldr (\_ y -> rotate GT y) x [1..n] == x
+  where
+    n = height (current x) x
+
 
 prop_viewview r  x   =
     let n  = current x
@@ -130,6 +137,11 @@ prop_viewview r  x   =
 
     where _ = x :: T
 
+prop_view_idem (x :: T) r =
+    let i = fromIntegral $ r `mod` sz
+        sz = size x
+    in view i (view i x) == (view i x)
+
 prop_shiftshift r x =
     let n  = current x
     in shift n (shift r x) == x
@@ -304,9 +316,13 @@ main = do
 
         ,("focus",             mytest prop_focus1)
 
-        ,("rotate/rotate    ", mytest prop_rotaterotate)
+        ,("rotate l >> rotate r", mytest prop_rotaterotate1)
+        ,("rotate r >> rotate l", mytest prop_rotaterotate2)
+        ,("rotate all", mytest prop_rotate_all)
 
         ,("view/view        ", mytest prop_viewview)
+        ,("view idem        ", mytest prop_view_idem)
+
         ,("fullcache        ", mytest prop_fullcache)
         ,("currentwsvisible ", mytest prop_currentwsvisible)
         ,("ws screen mapping", mytest prop_ws2screen_screen2ws)
-- 
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