Testing functions that return other functions

• I have a function (myfun/1) that takes in a list of characters, and depending on the characters in the list, returns a list of named functions (that are defined in the same module)–which will be applied at a later time.

Enum.reduce(com_chars, [], fn x, acc ->
  case x do
    "." -> [&to_lowercase/1 | acc]
    "^" -> [&to_uppercase/1 | acc]
    _ -> [:error | acc]
  end
end)
|> Enum.reverse()

• when I test this function in ExUnit (after importing MyMod) with assert myfun([".", "^"]) == [&to_lowercase/1, &to_uppercase/1], the test fails for the following reasons:
  1. in the test, &to_lowercase/1 and &to_uppercase/1 are expanded to &MyMod.the_function/1
  2. myfun seems to return a list of lambdas and not the named functions: [#Function..., #Function...]
• I can get around this if I use fully qualified names in myfun, however this does not work if I pass in a function with a set argument, like &get_slice(&1, "[0-5]"). In this case the function shows up as a lambda on both sides of the assert (and not the same lambda either).

My question is: how exactly should I be testing functions that return other functions?