defmodule Mix.Tasks.Compile.UnusedTest do
  use ExUnit.Case, async: false

  alias Mix.Tasks.Compile.Unused

  describe "manifests/0" do
    test "returns an empty list (no manifest tracking)" do
      assert Unused.manifests() == []
    end
  end

  describe "clean/0" do
    test "returns :ok" do
      assert Unused.clean() == :ok
    end
  end

  describe "run/1" do
    test "manifests/0 and clean/0 are idempotent" do
      assert Unused.manifests() == Unused.manifests()
      assert Unused.clean() == :ok
      assert Unused.clean() == :ok
    end

    @tag :slow
    test "runs against the project and returns either :ok or :error tuple" do
      ExUnit.CaptureIO.capture_io(fn ->
        result = Unused.run([])
        assert match?({:ok, _}, result) or match?({:error, _}, result)
      end)
    end

    test "honors --severity option override" do
      ExUnit.CaptureIO.capture_io(fn ->
        result = Unused.run(["--severity", "error"])
        assert match?({:ok, _}, result) or match?({:error, _}, result)
      end)
    end

    @tag :slow
    test "accepts --severity warning, info, and unknown values" do
      for severity <- ["warning", "info", "garbage"] do
        ExUnit.CaptureIO.capture_io(fn ->
          result = Unused.run(["--severity", severity])
          assert match?({:ok, _}, result) or match?({:error, _}, result)
        end)
      end
    end
  end
end