Ruby -> Elixir User Example

user.ex

defmodule MyProject.User do
  defstruct [:first, :last, :role]

  def is_admin?(%__MODULE__{role: "admin"}), do: true
  def is_admin?(_user), do: false

  def full_name(user, _opts \\ []) when not is_nil(user) do
    build_full_name(user)
  end

  def last_comma_first(user) do

  end

  defp build_full_name(user) do
    [user.last, user.first]
    |> IO.inspect()
    |> Enum.join(", ")

    "#{user.first} #{user.last}"
  end
end

user_test.exs

defmodule MyProject.UserTest do
  use ExUnit.Case

  alias MyProject.User

  setup [:create_user]

  describe "is_admin?" do
    test "when role is admin", %{user: user} do
      user = %{user | role: "admin"}

      assert true = User.is_admin?(user)
    end

    test "when role is NOT admin", %{user: user} do
      user = %{user | role: "manager"}

      assert User.is_admin?(user) == false
    end
  end

  defp create_user(_) do
    {:ok, user: %User{role: ""}}
  end
end