Ruby/Cucumber - 'puts' 造成麻烦答案

【问题标题】：Ruby/Cucumber - 'puts' causing troubleRuby/Cucumber - 'puts' 造成麻烦
【发布时间】：2015-09-17 11:36:51
【问题描述】：

我们最近在另一台机器上安装了我们框架的副本，由于某种原因，我们在使用“puts”而不是“Kernel.puts”时出现错误（我们使用 Ruby）

这不是一个大问题，但我们偶尔会使用“puts”来写入黄瓜结果文件。

这只发生在一台机器上，而不是另一台机器上。两者都是mac mini，规格相同。

两台机器具有相同的 gemlist、相同版本的 Ruby 等（它们几乎同时安装）。

其他人看到了吗？

日志：

2015-06-30 14:44:59 +0100 OUT: Error: undefined method <<' for nil:NilClass 2015-06-30 14:44:59 +0100 OUT: /Library/Ruby/Gems/2.0.0/gems/gherkin-2.12.2/lib/gherkin/formatter/json_formatter.rb:89:inwrite'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/formatter/gherkin_formatter_adapter.rb:166:in puts' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:181:inblock in send_to_all'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:179:in each' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:179:insend_to_all'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:173:in broadcast' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:154:inputs'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/user_interface.rb:14:in puts' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/rb_support/rb_world.rb:107:inputs'
/Users/jenkins/workspace/TEST-regression-test_trial_mini/automation/ios/features/support/hooks.rb:104:in block in <top (required)>' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/core_ext/instance_exec.rb:48:ininstance_exec'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/core_ext/instance_exec.rb:48:in block in cucumber_instance_exec' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/core_ext/instance_exec.rb:69:incucumber_run_with_backtrace_filtering'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/core_ext/instance_exec.rb:36:in cucumber_instance_exec' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/rb_support/rb_hook.rb:14:ininvoke'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:114:in invoke' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:102:inblock in execute_before'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:101:in each' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:101:inexecute_before'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:15:in before' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/support_code.rb:112:inblock in fire_hook'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/support_code.rb:111:in each' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/support_code.rb:111:infire_hook'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime.rb:107:in before' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime.rb:98:inbefore_and_after'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime.rb:82:in block in with_hooks' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/support_code.rb:120:incall'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/support_code.rb:120:in block (3 levels) in around' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:9:inblock in around'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:97:in call' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:97:inexecute_around'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/language_support/language_methods.rb:8:in around' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/support_code.rb:119:inblock (2 levels) in around'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/support_code.rb:123:in call' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime/support_code.rb:123:inaround'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime.rb:94:in around' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime.rb:81:inwith_hooks'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:13:in execute' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/scenario.rb:32:inblock in accept'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/scenario.rb:79:in with_visitor' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/scenario.rb:31:inaccept'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:58:in block in visit_feature_element' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:170:inbroadcast'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:57:in visit_feature_element' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/feature.rb:38:inblock in accept'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/feature.rb:37:in each' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/feature.rb:37:inaccept'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:27:in block in visit_feature' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:170:inbroadcast'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:26:in visit_feature' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/features.rb:28:inblock in accept'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/features.rb:17:in each' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/features.rb:17:ineach'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/features.rb:27:in accept' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:21:inblock in visit_features'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:170:in broadcast' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/ast/tree_walker.rb:20:invisit_features'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/runtime.rb:49:in run!' /Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/lib/cucumber/cli/main.rb:47:inexecute!'
/Library/Ruby/Gems/2.0.0/gems/cucumber-1.3.18/bin/cucumber:13:in <top (required)>' /usr/bin/cucumber:23:inload'
/usr/bin/cucumber:23:in

【问题讨论】：

您能否提供带有puts的代码片段？
在 Cucumber 步骤定义中，我们有： puts "Generating Service Provider"。这是我们正在调用的方法（在一个单独的类中）： def puts( o ) timenow = Time.now if o .is_a? 数组 msg = timenow.to_s+" OUT: "+o.to_s else msg = timenow.to_s+" OUT: "+o end super(msg.black) end

标签： ruby macos cucumber appium

【解决方案1】：

某处某处覆盖了您的puts。你只需要找到它。作为替代方案，请使用warn。来自 Avdi Grimm 的 Exceptional Ruby：

puts 然而，作为一种失败报告方法，还有一些不足之处。因为它的输出到了默认缓冲的$stdout，所以输出可能不会立即打印出来，或者它可能会以令人惊讶的顺序输出

warn 更简洁，同时仍使用 $stderr 作为其输出流。另请注意，通过将 -W0 标志传递给 Ruby，可以暂时关闭 warn 的输出。

【讨论】：

太好了——非常感谢！这是我第一次看到 put 有问题，我们将实施您的建议，看看会发生什么。