tdd livebook

solution.ex

defmodule Solution do
  def remove_duplicate_chars(string) do
    string
    |> String.codepoints()
    |> Enum.reduce(fn char, acc ->
      acc = if String.contains?(acc, char) do
        acc
      else
        acc <> char
      end
    end)
  end
end

test.ex

ExUnit.start(auto_run: false)

defmodule SolutionTest do
  use ExUnit.Case, async: false

  describe "Testing remove duplicate chars" do
    test "remove a from aaabc" do
      assert Solution.remove_duplicate_chars("aaabc") === "abc"
    end
  end
end

ExUnit.run()