检查"命令"的输出应包含NilClass的意外崩溃

Question

为了使用Cucumber作为命令行脚本,我按照提供的说明安装了aruba gem.它在我的Gemfile中,我可以验证是否安装了正确的版本并且我已经包含了

require 'aruba/cucumber'

在'features/env.rb'中

为了确保它的工作,我写了以下场景:

@announce
Scenario: Testing cucumber/aruba
    Given a blank slate
Then the output from "ls -la" should contain "drw"

假设事情应该失败.

它确实失败了,但由于错误的原因它失败了:

@announce
Scenario: Testing cucumber/aruba                 
    Given a blank slate                        
    Then the output from "ls -la" should contain "drw"
        You have a nil object when you didn't expect it!
        You might have expected an instance of Array.
        The error occurred while evaluating nil.[] (NoMethodError)
        features/dataloader.feature:9:in `Then the output from "ls -la" should contain "drw"'

任何人都有任何想法为什么这不起作用？这似乎是非常基本的阿鲁巴行为.

Answer 1

你错过了"何时"步骤 - aruba"输出应该包含"步骤要求命令已经运行(它本身不运行它,它只查找它).

@announce
Scenario: Testing cucumber/aruba
    Given a blank slate
    When I run `ls -la`
    Then the output from "ls -la" should contain "drw"

这在我的机器上产生:

@announce
Scenario: Testing cucumber/aruba                     # features/test_aruba.feature:8
    When I run `ls -la`                                # aruba-0.4.11/lib/aruba/cucumber.rb:56
      $ cd /Users/d.chetlin/dev/mine/ladder/tmp/aruba
      $ ls -la
      total 0
      drwx------  2 d.chetlin  staff   68 Feb 15 23:38 .
      drwx------  7 d.chetlin  staff  238 Feb 15 23:38 ..

    Then the output from "ls -la" should contain "drw" # aruba-0.4.11/lib/aruba/cucumber.rb:86

1 scenario (1 passed)
2 steps (2 passed)
0m0.465s