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newtype Fizz = Fizz Int deriving (Show) | |
newtype Buzz = Buzz Int deriving (Show) | |
newtype Other = Other Int deriving (Show) | |
instance Arbitrary Fizz where | |
arbitrary = do | |
x <- (arbitrary `suchThat` (\n -> fizzBuzz n == "Fizz")) | |
return (Fizz x) | |
instance Arbitrary Buzz where | |
arbitrary = do | |
x <- (arbitrary `suchThat` (\n -> fizzBuzz n == "Buzz")) | |
return (Buzz x) | |
instance Arbitrary Other where | |
arbitrary = do | |
x <- (arbitrary `suchThat` (\n -> fizzBuzz n == (show n) && n /= 0)) | |
return (Other x) | |
prop_fizzBuzz :: Fizz -> Buzz -> Bool | |
prop_fizzBuzz (Fizz a) (Buzz b) = fizzBuzz (a * b) == "FizzBuzz" | |
prop_fizzFizz :: Fizz -> Fizz -> Bool | |
prop_fizzFizz (Fizz a) (Fizz b) = fizzBuzz (a * b) == "Fizz" | |
prop_buzzBuzz :: Buzz -> Buzz -> Bool | |
prop_buzzBuzz (Buzz a) (Buzz b) = fizzBuzz (a * b) == "Buzz" | |
prop_fizz :: Other -> Fizz -> Bool | |
prop_fizz (Other a) (Fizz b) = fizzBuzz (a * b) == "Fizz" | |
prop_buzz :: Other -> Buzz -> Bool | |
prop_buzz (Other a) (Buzz b) = fizzBuzz (a * b) == "Buzz" |
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