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Test that update preserves invariants of Selection

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This commit is contained in:
Max Rabkin 2009-09-29 16:31:39 +00:00
parent f0e835ebe2
commit cd43a200bf
2 changed files with 10 additions and 9 deletions
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2
XMonad/Layout/Selective.hs
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@ -25,7 +25,7 @@ import XMonad.StackSet
import XMonad.Layout.LayoutModifier
import Control.Applicative ((<$>))
-- invariant: 0 <= nMaster <= start; 0 <= nRest
-- invariant: 0 <= nMaster <= start; 1 <= nRest
data Selection = Sel { nMaster :: Int, start :: Int, nRest :: Int }
deriving (Read, Show, Eq)

17
tests/test_Selective.hs
View File

@ -28,13 +28,11 @@ arbPos = (+1) . abs <$> arbitrary
-- (when the selection is normalized)
prop_select_length sel (stk :: Stack Int) =
(length . integrate $ select sel' stk) == ((nMaster sel' + nRest sel') `min` length (integrate stk))
where
sel' = update sel stk
where sel' = update sel stk
-- update normalizes selections (is idempotent)
prop_update_idem sel (stk :: Stack Int) = sel' == update sel' stk
where
sel' = update sel stk
where sel' = update sel stk
-- select selects the master pane
prop_select_master sel (stk :: Stack Int) =
@ -42,8 +40,7 @@ prop_select_master sel (stk :: Stack Int) =
-- the focus should always be selected in normalized selections
prop_select_focus sel (stk :: Stack Int) = focus stk == (focus $ select sel' stk)
where
sel' = update sel stk
where sel' = update sel stk
-- select doesn't change order (or duplicate elements)
-- relies on the Arbitrary instance for Stack Int generating increasing stacks
@ -51,6 +48,12 @@ prop_select_increasing sel (stk :: Stack Int) =
let res = integrate $ select sel stk
in and . zipWith (<) res $ tail res
-- update preserves invariants on selections
prop_update_nm sel (stk :: Stack Int) = nMaster (update sel stk) >= 0
prop_update_start sel (stk :: Stack Int) = nMaster sel' <= start sel'
where sel' = update sel stk
prop_update_nr sel (stk :: Stack Int) = nRest (update sel stk) >= 0
-- moving the focus to a window that's already selected doesn't change the selection
prop_update_focus_up sel (stk :: Stack Int) x' =
(length (up stk) >= x) && ((up stk !! (x-1)) `elem` integrate stk') ==>
@ -68,7 +71,5 @@ prop_update_focus_down sel (stk :: Stack Int) x' =
sel' = update sel stk
stk' = select sel' stk
upSel sel stk = let sel' = update sel stk in (sel', select sel' stk)
focusUp stk = stk { up=tail (up stk), focus=head (up stk), down=focus stk:down stk }
focusDown stk = stk { down=tail (down stk), focus=head (down stk), up=focus stk:up stk }