rails optional parameter bug

test.rb

# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  # Activate the gem you are reporting the issue against.
  gem "rails", "6.0.3"
end

require "rack/test"
require "action_controller/railtie"

class TestApp < Rails::Application
  config.root = __dir__
  config.hosts << "example.org"
  config.session_store :cookie_store, key: "cookie_store_key"
  secrets.secret_key_base = "secret_key_base"

  config.logger = Logger.new($stdout)
  Rails.logger  = config.logger

  routes.draw do
    scope "/(:team)" do
      resources :users
    end
  end
end

class UsersController < ActionController::Base
  include Rails.application.routes.url_helpers

  def index
    render plain: users_path
  end
end

require "minitest/autorun"

class BugTest < Minitest::Test
  include Rack::Test::Methods
  include Rails.application.routes.url_helpers

  def test_optional_scope
    get "/users"
    assert_equal "/users", last_response.body

    # the bellow is failing. It should return "/5/users", but is returnins "/users" instead
    get "/5/users"
    assert_equal "/5/users", last_response.body
  end

  private
  def app
    Rails.application
  end
end