How to parametryze rails system test based on fixture objects

In a Rails (5.2) project I want to parametrize a system test (Capybara) based on different objects from a test fixture. I have:

class SomethingWithUsers < ApplicationSystemTestCase
  setup do
    @user1 = users(:test_user1)
    @user2 = users(:test_user2)
  end
  test "some_test" do
    login @user1
    do_stuff
    assert other_stuff
   end
end

and I have a users.yml fixture.

So now instead of adding second test for @user2, I want to parametrize the some_test

I tried:

  [@user1, @user2].each do |user|
    test "some_test" + user.name
      login user
      do_stuff
      assert other_stuff
    end
  end

but user gets nil. So obviously I don't have access to these vars in this way.

[users(:test_user1), users(:test_user2)].each do |user|

is also not working. So I am out of ideas.