Rails: How can I ignore fixtures for single test

I have two tests. The results of each depend upon the user count.

At the moment, I have no user fixtures. The second test introduces a user in its setup method. The first test would fail if there were users in the db.

But I want to introduce users in users.yml. As such, the second test will fail because of the existing users. Is there any way I can instruct this test to ignore fixtures/users.yml?

require 'test_helper'

class UsersSignupTestWithoutExistingUsers < ActionDispatch::IntegrationTest
  test "Signup page is accessible" do
    get new_user_registration_path
    assert_response :success
  end
end

class UsersSignupTestWithExistingUsers < ActionDispatch::IntegrationTest
  def setup
    post user_registration_path, params: {user: {
      email:                 "user@test.com",
      password:              "password",
      password_confirmation: "password"
    }}
  end

  test "Signup page will redirect" do
    get new_user_registration_path
    assert_response :redirect
  end
end