Private—Expose private functions for testing.

Sometimes you want to test all those private functions in your modules. But Elixir doesn't make it easy to get to them. As a result, you end up trying to exercise them by setting up convoluted calls to the public API.

private to the rescue. It switches the visibility of functions so that they are exposed when the Mix environment is :test, and private otherwise.

  defmodule MyMod do
    use Private

    def api1() do ...
    def api2() do ...

    private do
      def helper1() do...
      def helper2() do...
    end

    def api3() do ...

    private do
      defp helper3() do...
    end
 end

All functions in the private block will be defined as private unless the Mix environment is :test.

In the test environment, def will be left unchanged, and defp will be changed to def. In all other environments, def will be changed to defp and defp will be left unchanged.

Installation

@deps [
  private: "> 0.0.0"
]