224 lines
8.8 KiB
Elm
224 lines
8.8 KiB
Elm
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module Test.Tools.RationalOrder exposing (..)
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import Test exposing (..)
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import Fuzz exposing (Fuzzer)
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import Expect
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import Internal.Tools.RationalOrder as RO exposing (RationalOrder(..))
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fuzzer : Fuzzer RationalOrder
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fuzzer =
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Fuzz.map2 With Fuzz.int (Fuzz.lazy (\_ -> Fuzz.maybe fuzzer))
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twoUnequal : Fuzzer (RationalOrder, RationalOrder)
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twoUnequal =
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fuzzer
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|> Fuzz.andThen
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(\o ->
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Fuzz.map2
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(\o1 o2 ->
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if RO.compare o1 o2 == LT then
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( o1, o2 )
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else
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( o2, o1 )
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)
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(Fuzz.constant o)
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(Fuzz.filter ((/=) o) fuzzer)
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)
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suite : Test
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suite =
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describe "RationalOrder"
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[ describe "Semantic truths"
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[ describe "After is always greater"
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[ fuzz fuzzer "Forwards"
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(\o ->
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Expect.equal LT (RO.compare o (RO.after o))
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)
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, fuzz fuzzer "Backwards"
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(\o ->
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Expect.equal GT (RO.compare (RO.after o) o)
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)
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]
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, describe "Before is always lesser"
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[ fuzz fuzzer "Forwards"
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(\o ->
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Expect.equal GT (RO.compare o (RO.before o))
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)
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, fuzz fuzzer "Backwards"
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(\o ->
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Expect.equal LT (RO.compare (RO.before o) o)
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)
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]
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, describe "Two unequal == two unequal"
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[ fuzz twoUnequal "Forwards"
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(\(small, big) ->
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Expect.equal LT (RO.compare small big)
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)
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, fuzz twoUnequal "Backwards"
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(\(small, big) ->
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Expect.equal GT (RO.compare big small)
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)
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]
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, describe "compare"
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[ fuzz2 fuzzer fuzzer "EQ iff same value"
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(\o1 o2 ->
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Expect.equal
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(o1 == o2)
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(RO.compare o1 o2 == EQ)
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)
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, fuzz2 fuzzer fuzzer "LT iff opposite GT"
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(\o1 o2 ->
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Expect.equal
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(RO.compare o1 o2 == LT)
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(RO.compare o2 o1 == GT)
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)
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]
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, describe "Between is always between"
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[ fuzz twoUnequal "Less than first - forwards"
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(\(small, big) ->
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(RO.between small big)
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|> RO.compare small
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|> Expect.equal LT
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)
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, fuzz twoUnequal "Less than first - backwards"
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(\(small, big) ->
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small
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|> RO.compare (RO.between small big)
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|> Expect.equal GT
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)
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, fuzz twoUnequal "Less than second - forwards"
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(\(small, big) ->
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RO.between small big
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|> RO.compare big
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|> Expect.equal GT
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)
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, fuzz twoUnequal "Less than second - backwards"
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(\(small, big) ->
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big
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|> RO.compare (RO.between small big)
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|> Expect.equal LT
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)
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]
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]
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, describe "Between creates between"
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[ test "With 0 Nothing <--> With 1 Nothing"
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(\() ->
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RO.between (With 0 Nothing) (With 1 Nothing)
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|> Expect.equal (With 0 (Just (With 0 Nothing)))
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)
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, test "With 1 Nothing <--> With 0 Nothing"
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(\() ->
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RO.between (With 1 Nothing) (With 0 Nothing)
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|> Expect.equal (With 0 (Just (With 0 Nothing)))
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)
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, test "With 0 is filled between With 1 Nothing"
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(\() ->
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With 0 Nothing
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> Expect.equal (With 0 (Just (With 5 Nothing)))
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)
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, test "Will start counting high level as soon as possible"
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(\() ->
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With 0 Nothing
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> Expect.equal (With 2 Nothing)
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)
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, test "Will start counting high level, then return lower level"
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(\() ->
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With 0 Nothing
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 1 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> RO.between (With 5 Nothing)
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|> Expect.equal (With 4 (Just (With 6 Nothing)))
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)
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, fuzz2 fuzzer fuzzer "Between is commutative"
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(\o1 o2 ->
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Expect.equal (RO.between o1 o2) (RO.between o2 o1)
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)
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]
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, describe "After"
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[ fuzz Fuzz.int "One more - level 1"
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(\a ->
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Expect.equal
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( RO.after <| With a Nothing )
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( With (a + 1) Nothing)
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)
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, fuzz2 Fuzz.int Fuzz.int "One more - level 2"
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(\a b ->
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Expect.equal
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( RO.after <| With a <| Just <| With b Nothing )
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( With (a + 1) Nothing)
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)
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, fuzz3 Fuzz.int Fuzz.int Fuzz.int "One more - level 3"
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(\a b c ->
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Expect.equal
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( RO.after <| With a <| Just <| With b <| Just <| With c Nothing )
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( With (a + 1) Nothing)
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)
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]
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, describe "Before"
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[ fuzz Fuzz.int "One less - level 1"
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(\a ->
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Expect.equal
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( RO.before <| With a Nothing )
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( With (a - 1) Nothing)
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)
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, fuzz2 Fuzz.int Fuzz.int "One less - level 2"
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(\a b ->
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Expect.equal
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( RO.before <| With a <| Just <| With b Nothing )
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( With (a - 1) Nothing)
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)
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, fuzz3 Fuzz.int Fuzz.int Fuzz.int "One less - level 3"
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(\a b c ->
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Expect.equal
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( RO.before <| With a <| Just <| With b <| Just <| With c Nothing )
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( With (a - 1) Nothing)
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)
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]
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, describe "Compare vs. list compare"
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[ fuzz2
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(Fuzz.listOfLengthBetween 1 32 Fuzz.int)
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(Fuzz.listOfLengthBetween 1 32 Fuzz.int)
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"Compares the same between normal lists and orders"
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(\l1 l2 ->
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Expect.equal
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( Just <| Basics.compare l1 l2 )
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( Maybe.map2 RO.compare (RO.fromList l1) (RO.fromList l2))
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)
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, fuzz2 fuzzer fuzzer "Compares the same when converted to list"
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(\o1 o2 ->
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Expect.equal
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( RO.compare o1 o2 )
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( Basics.compare (RO.toList o1) (RO.toList o2) )
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)
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]
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]
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