ruby-on-rails - RSpec 中是否有与 Cucumber 的 "Scenarios"等效的内容，还是我以错误的方式使用 RSpec？

Question

Cucumber's Scenarios 的简洁性和实用性给我留下了深刻的印象，它们是测试大量不同案例的好方法。

例如 cucumber 场景示例

Feature: Manage Users
In order to manage user details
As a security enthusiast
I want to edit user profiles only when authorized

Scenario Outline: Show or hide edit profile link
  Given the following user records
    | username | password | admin |
    | bob      | secret   | false |
    | admin    | secret   | true  |
  Given I am logged in as "<login>" with password "secret"
  When I visit profile for "<profile>"
  Then I should <action>

  Examples:
    | login | profile | action                 |
    | admin | bob     | see "Edit Profile"     |
    | bob   | bob     | see "Edit Profile"     |
    |       | bob     | not see "Edit Profile" |
    | bob   | admin   | not see "Edit Profile" |

(代码取自 Ryan Bates' More on Cucumber Screencast)

RSpec 中是否有等价物？

我想在 RSpec 中做同样的事情，并通过将不同的测试减少到场景表中的一行来干燥我的代码。

尽管我可以自己编写代码来执行此操作，但我正在考虑这样做的事实让我想知道两件事

如果这很有用，它可能已经存在，在这种情况下我该如何使用它？

如果它不存在，则表明它不应该以这种方式完成并且我正在错误地解决问题，我应该如何重新考虑我对 RSpec 的方法？

哪个答案是正确的，如果有用，我该怎么做？

Answer 1

尝试以下方法。我喜欢它的结果。

describe StateDateMethods do
  before :each do
    @product = OpenStruct.new
    @product.extend StateDateMethods
  end

  def parse_date(unparsed_date_value)
    unless unparsed_date_value.nil?
      DateTime.strptime(unparsed_date_value, '%m/%d/%Y')
    end
  end

  context '#pre_order?' do
    examples = [
      # [visible_on, pre_order_on, for_sale_on] => method_result
      { :inputs => [nil, nil, nil], :expected => false },
      { :inputs => ['1/1/2001', nil, nil], :expected => false },
      { :inputs => ['1/1/2001', '1/1/2001', nil], :expected => true },
      { :inputs => ['1/1/2001', '1/2/2001', nil], :expected => true },
      { :inputs => ['1/1/2001', '1/1/2001', '1/2/2001'], :expected => false },
      { :inputs => ['1/1/2001', '1/1/2001', '1/1/3001'], :expected => true },
      { :inputs => ['1/1/2001', '1/1/3001', '1/2/3001'], :expected => false },
      { :inputs => ['1/1/3001', '1/1/3001', '1/2/3001'], :expected => false },
      { :inputs => ['1/1/2001', nil, '1/1/2001'], :expected => false },
      { :inputs => ['1/1/2001', nil, '1/1/3001'], :expected => false }
    ]
    examples.each do |example|
      inputs = example[:inputs]

      it "should return #{example[:expected].inspect} when visible_on == #{inputs[0].inspect}, pre_order_on == #{inputs[1].inspect}, for_sale_on == #{inputs[2].inspect}" do
        @product.visible_on = parse_date(inputs[0])
        @product.pre_order_on = parse_date(inputs[1])
        @product.for_sale_on = parse_date(inputs[2])

        @product.pre_order?.should == example[:expected]
      end
    end
  end
end

我认为这可以两全其美，因为它可以防止我重复自己，并且可以为每种情况创建不同的测试。

这是失败的样子:

....F.....

Failures:

  1) StateDateMethods#pre_order? should return false when visible_on == "1/1/2001", pre_order_on == "1/1/2001", for_sale_on == "1/2/2001"
     Failure/Error: @product.pre_order?.should == example[:expected]
       expected: false
            got: true (using ==)
     # ./spec_no_rails/state_date_methods_spec.rb:40:in `block (4 levels) in <top (required)>'

Finished in 0.38933 seconds
10 examples, 1 failure

Failed examples:

rspec ./spec_no_rails/state_date_methods_spec.rb:35 # StateDateMethods#pre_order? should return false when visible_on == "1/1/2001", pre_order_on == "1/1/2001", for_sale_on == "1/2/2001"

这是所有绿色的样子:

..........

Finished in 0.3889 seconds
10 examples, 0 failures