如何在Rails中使用Cucumber有一个负面情景？ [英] How do I have a negative scenario with Cucumber in Rails?

问题描述

我有一个负面情景来测试用黄瓜。具体来说，我想确保当有人发布一个包含无效句柄的网址时，网站会返回一个错误。

我的场景如下：

场景：创建一个句柄太短的人
当用tooshort命名为Fred的人更新
然后我应该得到一个500错误

我的步骤看起来像

当/ ^ person命名为（。）时使用句柄（。）更新$ / do | name，handle |
visit/ mobile / update？handle =＃{udid}& name =＃{name}

我运行的方案，它从来没有得到到THEN部分，因为错误从

错误：无句柄（RuntimeError） p>

这是CORRECT，When应该会出现500错误。

不知道怎么用短语作为负面测试。也许我应该使用不同于什么时候？

解决方案

如果你的正确行为，当你的步骤是提出一个错误你case使用lambda块来捕获这个RuntimeError ：

 当/ ^ person以（。）命名为。 | 
 lambda {
 visit/ mobile / update？handle =＃{udid}& name =＃{name}
} .should raise_error（No Handle）
 end 
  

您可能需要调整raise_error部分，因为我不知道错误的类型

 
 code>然后/ ^保存不应该成功$ / do 
 response.should be_nil 
 end 
  

I have a negative scenario to test with Cucumber. Specifically, I want to make sure that when someone posts a URL with an invalid handle then the site returns an error.

My scenario looks like:

Scenario: create person with too short a handle When person named "Fred" with handle "tooshort" updates Then I should get a 500 error

My step looks like

When /^person named "(.)" with handle "(.)" updates$/ do |name, handle| visit "/mobile/update?handle=#{udid}&name=#{name}"

When I run the scenario, it never gets to the THEN part because of the error from the When

ERROR: No Handle (RuntimeError)

This is CORRECT, the When should turn a 500 error.

I just don't know how to phrase the When as a negative test. Maybe I should use something different than a when?

解决方案

If for you the correct behavior of your When step is to raise an error you case use a lambda block to catch this RuntimeError:

When /^person named "(.)" with handle "(.)" updates$/ do |name, handle| 
  lambda { 
    visit "/mobile/update?handle=#{udid}&name=#{name}"
  }.should raise_error("No Handle")
end

You may have to tweak the raise_error part as I don't know exactly the type of error you are raising

And you can have a Then step like this one (starting point)

Then /^the save should not be successful$/ do
  response.should be_nil
end

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