Elixir: Supervisors

Instructions

The exercise doesn't pass checking. What to do? 😶

In my environment the code works, but not here 🤨

My code is different from the teacher's one 🤔

I've read the lessons but nothing is clear 🙄

Found a bug? Have something to add? Pull requests are welcome!

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Your exercise will be checked with these tests:

defmodule Test do
  use ExUnit.Case

  describe "incrementor code unchanged" do
    test "current_value work" do
      Incrementor.start_link()

      assert Incrementor.current_value() == 0
    end

    test "run work" do
      Incrementor.start_link()

      Incrementor.run()
      assert Incrementor.current_value() == 1

      Incrementor.run()
      assert Incrementor.current_value() == 2
    end
  end

  describe "decrementor code unchanged" do
    test "current_value work" do
      Decrementor.start_link()

      assert Decrementor.current_value() == 0
    end

    test "run work" do
      Decrementor.start_link()

      Decrementor.run()
      assert Decrementor.current_value() == -1

      Decrementor.run()
      assert Decrementor.current_value() == -2
    end
  end

  describe "solution supervisor work" do
    test "initialization work" do
      {:ok, pid} = Solution.start_link()

      assert [
               {Decrementor, _, :worker, [Decrementor]},
               {Incrementor, _, :worker, [Incrementor]}
             ] = Supervisor.which_children(pid)

      assert Supervisor.count_children(pid) == %{active: 2, workers: 2, supervisors: 0, specs: 2}
    end

    test "restart straregy" do
      {:ok, pid} = Solution.start_link()

      Decrementor.run()
      assert Decrementor.current_value() == -1

      Incrementor.run()
      assert Incrementor.current_value() == 1

      Process.exit(Process.whereis(Decrementor), :kill)
      Supervisor.restart_child(pid, Process.whereis(Decrementor))
      assert Supervisor.count_children(pid) == %{active: 2, workers: 2, supervisors: 0, specs: 2}
      assert Decrementor.current_value() == 0
      assert Incrementor.current_value() == 1

      Process.exit(Process.whereis(Incrementor), :kill)
      Supervisor.restart_child(pid, Process.whereis(Incrementor))
      assert Supervisor.count_children(pid) == %{active: 2, workers: 2, supervisors: 0, specs: 2}
      assert Decrementor.current_value() == 0
      assert Incrementor.current_value() == 0
    end
  end
end

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Teacher's solution will be available in:

20:00

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