Add Expect.equalArrays

[jfmengels]

When working with Arrays, I often find myself needing to use write expectations for them in tests. Unfortunately, while Expect.equalLists exists (and the same for Set/Dict), Expect.equalArrays doesn't. Therefore I often end up needing to write something like this:

some operation
  |> Array.toList
  |> Expect.equalLists [ ... ]

Adding a expectArrays : Array a -> Array a -> Expectation function would forego the need for the manual and maybe confusing conversion.

What I'm unsure of, is whether there should also be a function that—for convenience's sake—takes a List a for the expected collection.

expect??? : List a -> Array a -> Expectation

--

some operation
  |> Expect.equal??? [ 1, 2, 3 ]
-- instead of
some operation
  |> Expect.equal??? (Array.fromList [ 1, 2, 3 ])
-- or
some operation
  |> Array.toList
  |> Expect.equalLists [ 1, 2, 3 ]

This could be beneficial for equalSets and equalDicts as well.