Ruby 如何搜索字段并确认它'；是空的吗？

我是Ruby的新手，在cucumber中使用Ruby编写测试套件时，我已经陷入了深深的困境，几乎没有时间学习它

我试图写一行代码来检查网页上是否存在字段，并且所述字段是否为空

到目前为止，我已经：

Then /^I can verify that the fleet field is blank$/ do
  find_by_id('fleet', :text == nil)
end

我写的两个特性是：

Scenario: US1020-1  Confirm that the Date of Liability field is blank on screen
    When I navigate to the fleet vehicle search screen
    Then I can search for a valid record using Fleet number: "123456"
    And Registration number: "N253CSL"
    Then I can verify that the fleet field is blank


Scenario: US1020-2  Confirm that the Date of Liability field is blank on screen
    When I navigate to the fleet vehicle search screen
    And Registration number: "N253CSL"
    Then I can verify that the fleet field is blank

场景

US1020-1

应该会失败，因为我已经用

123456

填充到了舰队，但它通过了

注意：测试的其他元素、连接到网页、填写字段的ruby代码已经编写好了，可以使用了

任何对noob的帮助都会很好

谢谢

试试：

Then /^I can verify that the fleet field is blank$/ do
  expect(find_by_id('fleet').value).to be_blank
end