--- | An HUnit assertion that wraps the is_close function. Stolen
--- from the definition of assertEqual in Test/HUnit/Base.hs.
-assertClose :: String -> Point -> Point -> Assertion
-assertClose preface expected actual =
- unless (actual `is_close` expected) (assertFailure msg)
- where msg = (if null preface then "" else preface ++ "\n") ++
- "expected: " ++ show expected ++ "\n but got: " ++ show actual