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以下代码引发错误: undefined method 'any_instance' for String:Class

require 'rspec'

RSpec.configure do |config|
  config.mock_with :rspec
end

describe String do
  it 'stubs' do
    String.any_instance.stub(:foo).and_return(1)
    ''.foo.should eq(1)
  end
end

如何将Mocks模块包含在Class或Object类中？