Exunit - can value be passed to setup block?

silverdr · October 12, 2021, 4:02pm

Is there a way to pass value(s) to setup block?

I know I can give the “context” var and set values inside setup so that they propagate to the tests, which can consume them but I fail to see how a setup block could use value set outside of it. Am I missing something obvious or is it simply a no-no?

hauleth · October 12, 2021, 4:15pm

You can use tags or module attributes. Here is usage example

github.com

hauleth/mix_unused/blob/master/test/mix_unused/tracer_test.exs

defmodule MixUnused.TracerTest do
  use ExUnit.Case

  @subject MixUnused.Tracer

  doctest @subject

  ExUnit.Case.register_attribute(__MODULE__, :code, [])

  setup ctx do
    options = Code.compiler_options()
    name = Module.concat([__MODULE__, Test, ctx.test])

    Application.put_env(:mix_unused, :set, Remote)

    try do
      start_supervised!(@subject)

      quoted =
        quote do

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silverdr · October 12, 2021, 4:36pm

It doesn’t stop to amaze me how quick and helpful responses one gets in this community. Tags seem to fit my case very well

@tag my_key: my_value

setup context do
	IO.puts(context[:my_key])
end

proves this works. Thanks a lot!