How to start the :ex_unit app when compiling?

[lijie]

I'm writting tests using Elixir, wrote some helper modules in lib/ folder to simpilify test cases. These helper modules calls ExUnit.Case.assert, like this:

defmodule AccountHelper do
  use ExUnit.Case
  def expect_login_success(result) do
    assert(result.code == 0)
    ...
  end
end

When compiles, some errors occured:

$ mix compile
== Compilation error on file lib/account_helper.ex ==
** (RuntimeError) cannot use ExUnit.Case without starting ExUnit application, please call ExUnit.start() or explicitly start the :ex_unit app
    /Users/lijie/source/elixir/lib/ex_unit/lib/ex_unit/case.ex:35: ExUnit.Case."MACRO-__using__"/2
    lib/account_helper.ex:2: ExUnit.Case.__using__/1
    lib/account_helper.ex:2: AccountHelper (module)

 It is just compiling, why need to start :ex_unit app? and how to resolve it?

Best regards.

[Eric Meadows-Jönsson]

You should write test helpers in your test directory so that they are not compiled. You dont want to have test code in your production code. It is common to put this kind of code in test/test_helpers.exs. This file is auto required when running `mix test`.

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Eric Meadows-Jönsson

[José Valim]

The way ExUnit works is that at the moment you call use ExUnit.Case, it invokes the ExUnit server to register that test case so it can be run later. You could work around that but I agree with Eric that you don't want to have test code in your production code.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Lead Developer

On Fri, Nov 1, 2013 at 10:46 AM, lijie <cpu...@gmail.com> wrote:

--

[lijie]

Thanks.

This is an integration test project, and I also want to use ex_unit to do automated testing, run all tests every few minutes on online system, the test code is also production code for this project. I can put code to test/ directory, but I think that put into lib/ directory to let it be compiled will faster.

I modified code to 'import ExUnit.Assertions', it works.

[José Valim]

I modified code to 'import ExUnit.Assertions', it works.

Keep in mind that when running tests you will need to explicitly tell ExUnit to run those modules for testing. Besides that, everything should work fine.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Lead Developer

 

[lijie]

Thanks, these modules in lib/ directory are helper modules, only contains some assertions, all test cases be put into test/ directory.