Rspec给出错误的结果

rspec

context 'when some button is clicked ' do
it 'some other button value  in the DOM has to set false value' do
  find("label[for='someButton']").click()
  click_button('Save')
  allow_any_instance_of(SomeController).to receive(:update) do |*args|
    expect(args[0].params[:some][:some_param]).to be('xyz') # but here params[:some][:some_param] is 'true' still the test case is passing
   end
  end
 end 

我要走了 params[:some][:some_param] = 'true' 但测试用例还是通过了 任何想法!!!