Provide facilities to run tests inside fixtures

[Jason Axelson]

Hi,

I'm working on maintaining ElixirLS (https://github.com/elixir-lsp/elixir-ls/) and trying to cut down on the number of private api's it uses. One of these is a re-implementation of MixTest.Case that uses private functions from Mix.ProjectStack:

https://github.com/elixir-lsp/elixir-ls/blob/b1415ce8611657826083e6de7b793389b7edc549/apps/elixir_ls_utils/test/support/mix_test.case.ex

In order to replace that usage we need to be able to run our tests in various fixtures, similarly to how the mix tests do in https://github.com/elixir-lang/elixir/blob/c7f0295d6da268ffc85292e104f11f4d08423805/lib/mix/test/mix/umbrella_test.exs#L7

Here's an example of using the `in_fixture` from the copy of `MixTest.Case`:

https://github.com/elixir-lsp/elixir-ls/blob/7a1fed551739b2dafcf1634365ca3733ec8d18dd/apps/language_server/test/server_test.exs#L274

Any suggestions for alternative patterns would be helpful as well, but ideally the similar test cases could be kept in the same file so that they can be easily compared, even if they require code from different test fixtures.

Thanks,

Jason

[José Valim]

Hi Jason!

I wonder if you could stop and start the Mix application before and/or after every test and if that would be enough to purge/clear all state. Maybe it won't  work with `mix test` per-se but it is worth trying.

José Valim

www.plataformatec.com.br

Founder and Director of R&D

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[Jason Axelson]

Hi José!

I'm not sure I follow what you are proposing. How would we start/stop the Mix application? Do you mean using `Application.stop/1` (I don't see anything in the Mix docs about starting or stopping applications)?

Thanks,

Jason

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[José Valim]

Yes, precisely!

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[Jason Axelson]

Okay, I'll give it a try.

Thanks!

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