Rspec / Rails：使用finder_sql条件为has_many编写测试

Question

这是我的has_many声明：

  has_many :managed_athletes, class_name: "Athlete",
            finder_sql: ->(record) do
              record = self if record.nil?
              "SELECT DISTINCT users.* FROM users INNER JOIN contributorships
              ON users.id = contributorships.athlete_id 
              INNER JOIN invitations
              ON users.id = invitations.sender_id
              WHERE users.type IN ('Athlete') AND contributorships.user_id = #{record.id} 
              AND invitations.requester_id = #{record.id}
              AND (invitations.current_state = 'accepted')"
            end

这是我的Rspec测试（它失败了）。有没有办法为上面写一个测试？我可以将其转换为实例方法并对其进行测试，但是试图让它具有has_many范围。

it { should have_many(:managed_athletes).class_name "Athlete" }