Testing haskell equality on Doubles with HUnit?

Does HUnit have some way of doing approximate equalities? Clearly, this fails:

test1 = TestCase (assertEqual "Should equal" (get_scores) [(0.3, 0.3), (0.6, 0.36), (1.0, 0.3399999)])

For floating point approximate comparison, there's a library with some nice utils:

http://hackage.haskell.org/package/ieee754

Note: I don't know if there's a correct/official/accepted way to do this.

Here's the source code for assertEqual:

assertEqual :: (Eq a, Show a) => String -- ^ The message prefix 
                              -> a      -- ^ The expected value 
                              -> a      -- ^ The actual value
                              -> Assertion
assertEqual preface expected actual =
  unless (actual == expected) (assertFailure msg)
 where msg = (if null preface then "" else preface ++ "\n") ++
             "expected: " ++ show expected ++ "\n but got: " ++ show actual

Based on that and on JUnit's function for testing double equality, we could create our own in the same style:

import Control.Monad (unless)

assertEquals ::   String  -- ^ The message prefix
               -> Double  -- ^ The maximum difference between expected and actual
               -> Double  -- ^ The expected value
               -> Double  -- ^ The actual value
               -> Assertion
assertEquals preface delta expected actual = 
  unless (abs (expected - actual) < delta) (assertFailure msg)
 where msg = ... same as above ...

Since this question was first asked, the HUnit-approx package has been released.

It uses an implicit variable, epsilon, and an approximate equality operator, ~?~, instead of ~=?.

A short example:

tweak :: Float -> Float
tweak x = x * 1.0001

egApproxTest  = let ?epsilon = 0.01 in
    [ "strictEqual" ~: 0 ~=? tweak 0,
      "approxEqual" ~: 2 ~?~ tweak 2 ]