Parameterized testing with ExUnit

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I write an article Parameterized testing with ExUnit.The key concept is using ExUnit.Case.register_test/4 such as

ExUnit.start()

defmodule ParameterizedTest do
  use ExUnit.Case, async: true

  ExUnit.Case.register_attribute __ENV__, :pair

  for {lhs, rhs} <- [{"one", 1}, {"two", 2}, {"three", 3}] do
    @pair {lhs, rhs}

    test "#{lhs} convert to #{rhs}", context do
      {l, r} = context.registered.pair
      assert l === r
    end
  end

  test "pair should not have any value" do
    assert nil === @pair
  end
end