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I'm (still) experiencing floating point errors.

can compute general complex signum
expected: Complex 0.6 0.8
 but got: Complex 0.6000000000000001 0.8

Edit: I "solved" the problem by explicitly defining division (/) instead of only defining recip. Now my solution passes all example test cases. However when I submit it, it still gives an error every time.

can compute general complex signum
Falsifiable (after 1 test and 309 shrinks): 
NonZero {getNonZero = 1.4e-44}
NonZero {getNonZero = 1.0e-45}

If you structure main as

main = do
  hspec $ do
    describe "" $ do
      it "" $ do
        x `shouldBe` y
  hspec $ do
    describe "" $ do
      it "" $ do
        a `shouldBe` b

you don't increase the test indent continuously.

Quite unessential, but I think it looks better.