Designing Elixir Systems with OTP/

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Applying Named Setup Functions to Our Tests

Applying Named Setup Functions to Our Tests

Let’s start applying named setup functions to our responses.

We'll cover the following...

With the trade-offs in mind, we will choose to write some named setups to achieve the following:

  • Control duplication.

  • Simplify each test block.

Responses

Let’s start with /test/response_test.exs since it’s complex enough to need named setups, but simple enough to illustrate the concept.

The first step is to create the file with the basic heading, like this:

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defmodule ResponseTest do 
  use ExUnit.Case
  use QuizBuilders
end

We use the QuizBuilders macro to build in our fixtures.

Next, we’ll build some simple local functions to build a quiz with the exact quiz and templates we need. We’ll fill them in /test/response_test.exs, like this:

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  defp quiz() do
    fields = template_fields(generators: %{left: [1], right: [2]})
    build_quiz()
    |> Quiz.add_template(fields)
    |> Quiz.select_question
  end
  defp response(answer) do
    Response.new(quiz(), "mathy@example.com", answer)
  end

  • Since we’re testing for correct responses, we want a repeatable template with only one possible ...