Elixir testing - ExUnit - Repeating Data Instances

Question

I'm using ExUnit for testing my Elixir app, which is a card game.

I find that with every test I write, I start by creating a fresh deck of cards.

test "Do This Crazy Thing do
  deck = Deck.create()
  [...]
end

test "Do This Other Crazy Unrelated Thing" do
  deck = Deck.create()
   [...]
end

Is there a way to factor this out so that a new deck can just be created before every test case? I know there's something close to this with setup do [...] end, but I don't think that's the solution for me.

Do I need a different test framework? Do I need to use setup in some way I haven't thought of yet?

-Augie

Ryan Cromwell · Accepted Answer · 2014-01-06 05:35:10Z

9

You can use def setup with the meta has just for this.

Example:

defmodule DeckTest do
  use ExUnit.Case

  setup do
    {:ok, cards: [:ace, :king, :queen] }
  end

  test "the truth", meta do
    assert meta[:cards] == [:ace, :king, :queen]
  end
end

Here's some more info

edited Jan 6, 2014 at 5:35

answered Jan 6, 2014 at 5:28

Ryan Cromwell

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3 Comments

AugieDB Over a year ago

It looks like it works as you suggest, but it's not worth it in the end for me because it's possibly even more typing and repetition than it started with for my small needs. But, hey, I have that in the tool kit now for when I'll really need it. Thanks!

nietaki Over a year ago

The link you posted is broken.

Ryan Cromwell Over a year ago

@nietaki which of the following links do you think is preferable: elixir-lang.org/docs/stable/ex_unit/… or elixir-lang.org/getting-started/mix-otp/…

Henrik N · Accepted Answer · 2015-07-04 08:25:22Z

1

Another option that could work depending on your needs:

defmodule DeckTest do
  use ExUnit.Case

  defp cards, do: [:ace, :king, :queen]

  test "the truth" do
    assert cards == [:ace, :king, :queen]
  end
end

answered Jul 4, 2015 at 8:25

Henrik N

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