mirror of
https://github.com/correl/elm.git
synced 2024-12-23 11:15:00 +00:00
63 lines
1.6 KiB
Elm
63 lines
1.6 KiB
Elm
module RunLengthEncodingPropertyChecks exposing (propertyTests)
|
|
|
|
import ElmTest
|
|
import Check exposing (suite, claim, that, is, for, quickCheck)
|
|
import Check.Producer as P
|
|
import Check.Test
|
|
import RunLengthEncoding exposing (decode, encode)
|
|
import String as S
|
|
import Char
|
|
|
|
|
|
{-
|
|
Currently disabled until elm-check is updated to support Elm 0.17
|
|
|
|
Welcome! This is a property based test which will generate a bunch of random
|
|
test cases in an attempt to find edge cases in your solution. If all goes well,
|
|
any code that passes the regular tests should be fine here as well. If it goes
|
|
less well, this should hopefully narrow the failure down to a useful test case.
|
|
|
|
Good luck!
|
|
-}
|
|
|
|
|
|
claims : Check.Claim
|
|
claims =
|
|
suite "List Reverse"
|
|
[ claim "Encoding and decoding yields the original string"
|
|
`that` (\input -> decode (encode (S.concat input)))
|
|
`is` S.concat
|
|
`for` inputProducer
|
|
]
|
|
|
|
|
|
inputProducer : P.Producer (List String)
|
|
inputProducer =
|
|
P.tuple ( P.rangeInt 0 1001, upperCaseLetter )
|
|
|> P.convert (\( n, c ) -> S.repeat n (S.fromChar c))
|
|
(\s ->
|
|
( S.length s
|
|
, S.toList s |> List.head |> crashIfNothing
|
|
)
|
|
)
|
|
|> P.list
|
|
|
|
|
|
upperCaseLetter : P.Producer Char
|
|
upperCaseLetter =
|
|
P.filter Char.isUpper P.upperCaseChar
|
|
|
|
|
|
crashIfNothing : Maybe a -> a
|
|
crashIfNothing a =
|
|
case a of
|
|
Just a ->
|
|
a
|
|
|
|
Nothing ->
|
|
Debug.crash "Nothing!"
|
|
|
|
|
|
propertyTests : ElmTest.Test
|
|
propertyTests =
|
|
Check.Test.evidenceToTest (quickCheck claims)
|