test/medical_transcription/utilities_test.exs

defmodule MedicalTranscription.UtilitiesTest do
  use ExUnit.Case, async: true
  alias MedicalTranscription.Utilities

  describe "tally/1" do
    test "it counts elements in an enumerable of atoms" do
      input = [:one, :two, :three, :two, :two, :one]

      assert Utilities.tally(input) == %{
               one: 2,
               two: 3,
               three: 1
             }
    end
  end

  describe "tally_to_string/1" do
    test "it formats a string version of the output of `tally/1`" do
      input = %{
        one: 2,
        two: 3,
        three: 1
      }

      assert Utilities.tally_to_string(input) == "one (2), two (3), three (1)"
    end
  end
end