Testing Private Functions

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This looks really cool but I’m getting the following error

mix test --trace test/problem11_test.exs:13
    warning: function data/0 is unused
    │
 16 │   defp data do
    │        ~
    │
    └─ lib/problem11.ex:16:8: Problem11 (module)

Running ExUnit with seed: 86835, max_cases: 1
Excluding tags: [:test]
Including tags: [location: {"test/problem11_test.exs", 13}]


Problem11Test [test/problem11_test.exs]
  * test greets the world (77.5ms) [L#12]

  1) test greets the world (Problem11Test)
     test/problem11_test.exs:12
     ** (UndefinedFunctionError) function Problem11."REPATCH-PRIVATE-data"/0 is undefined or private
     code: assert "sucka" == private Problem11.data()
     stacktrace:
       (ex_euler 0.1.0) Problem11."REPATCH-PRIVATE-data"()
       test/problem11_test.exs:13: (test)


Finished in 0.2 seconds (0.2s async, 0.00s sync)
1 test, 1 failure

shell returned 2

Press ENTER or type command to continue

here’s the spec

defmodule Problem11Test do
  use ExUnit.Case, async: true
  use Repatch.ExUnit
  import Repatch, only: [private: 1]

  doctest Problem11

  setup do
     Repatch.spy(Problem11)
  end

  test "greets the world" do
    assert "sucka" == private Problem11.data()
  end
end