Proposal: ex_unit test data provider

[pgo...@xerpa.com.br]

Hi everybody,

I thought to implement data providers in elixir unit tests.

It would be like this:

defmodule MyTest do
  use ExUnit.Case

  @contexts [
    "my_value_1",
    %{my_value: 2},
    3
  ]

  describe "my test case" do
    @data_provider @contexts
    test "my object tests", %{context: %{my_value: value}} do
      # It will match once
      assert value == 2
    end

    @data_provider @contexts
    test "", %{context: item} do
      # It will run this function tree times,
      # for each item in @contexts. item value on each loop execution:
      #
      # - "my_value"
      # - %{my_value: 2}
      # - 3
    end
  end

end

It already exists in other languages and I think that it is very useful.

Best regards!

[fwat...@xerpa.com.br]

describe "my test case" do

    test_cases_for ["should do something with users", "should do something else with users"], do:
       [
           %{username: "Foobar1", likes_to: ["play soccer"]},
           %{username: "Foobar2", likes_to: ["play basketball", "go on a trip"]},
           %{username: "Foobar3", likes_to: []},
       ]

    #Loops into test_cases
    test "should do something with users", cases: %{username: username, likes_to: likes_to} do
       #Do something with those params
    end


    test "should do something else with users", cases: %{username: username, likes_to: likes_to} do
       #Do something with those params
    end
end

I think it would be cool if ExUnit had something like this, isn`t it?

[Andrea Leopardi]

We usually try to keep the core language as simple as possible. However Elixir provides all the extensibility that allows you to implement something like this yourself, for example by defining your own test macros. We usually advise to start with a library and see how it goes, and I think that would be a great idea here as well!

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Andrea Leopardi

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