| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
Hedgehog.Internal.Tripping
Synopsis
- tripping :: (MonadTest m, Applicative f, Show b, Show (f a), Eq (f a), HasCallStack) => a -> (a -> b) -> (b -> f a) -> m ()
Documentation
tripping :: (MonadTest m, Applicative f, Show b, Show (f a), Eq (f a), HasCallStack) => a -> (a -> b) -> (b -> f a) -> m () Source #
Test that a pair of encode / decode functions are compatible.
Given a printer from some type a -> b, and a parser with a
potential failure case b -> f a. Ensure that a valid a round
trips through the "print" and "parse" to yield the same a.
For example, types should have tripping Read and Show
instances:
trippingShowRead :: (Show a, Read a, Eq a, MonadTest m) => a -> m () trippingShowRead a = tripping a show readEither