javascript – 如何在运行测试之前暂停Karma的自动监视功能？

我遇到了我认为是Vim保存文件和Karma重新运行我的Jasmine单元测试之间的竞争条件.这是一个四个测试运行的序列,演示了症状(我截断了错误日志中的极长路径)：

$karma start karma.conf.js --auto-watch
[... snip a lot of coding and test running ...]
PhantomJS 1.6 (Linux) LOG: 'Running tests at 2013-08-14T08:19:57.252Z'
PhantomJS 1.6 (Linux): Executed 4 of 4 SUCCESS (0.307 secs / 0.013 secs)
PhantomJS 1.6 (Linux) LOG: 'Running tests at 2013-08-14T08:20:09.866Z'
PhantomJS 1.6 (Linux): Executed 4 of 4 SUCCESS (0.288 secs / 0.012 secs)
PhantomJS 1.6 (Linux) LOG: 'Running tests at 2013-08-14T08:20:14.366Z'
PhantomJS 1.6 (Linux) controller should have a breadcrumb after $routeChangeSuccess Failed
        Error: No module: myapp.question
            at /home/rmunn/.../angular.js:1124
            at ensure (/home/rmunn/.../angular.js:1065)
            at module (/home/rmunn/.../angular.js:1296)
            at /home/rmunn/.../angular.js:2806
        TypeError: 'undefined' is not an object (evaluating 'rootScope.$broadcast')
            at /home/rmunn/.../unit/controlleRSSpec.js:35
PhantomJS 1.6 (Linux): Executed 4 of 4 (1 Failed) (0.312 secs / 0.014 secs)
PhantomJS 1.6 (Linux) LOG: 'Running tests at 2013-08-14T08:20:28.588Z'
PhantomJS 1.6 (Linux): Executed 4 of 4 SUCCESS (0.287 secs / 0.013 secs)

我用来触发这四次运行的唯一变化是在question.js文件中添加和删除空格;没有实质性的代码更改,但运行#3失败,其中运行1,2和4成功.

我的Vim配置设置为保留备份文件,默认情况下,Vim通过重命名原始文件并编写新文件来保留备份文件. (除非在某些条件下,这里不适用).我的想法是,我正在触发竞争条件：Vim重命名question.js(或我刚刚编辑的任何文件),Karma检测到更改并开始运行测试,因为我现在测试的次数很少,测试全部在Linux进程调度程序控制回Vim之前运行.一旦Vim再次被调度,它就会写出question.js的新内容,但是到那时为止,依赖于现有的question.js并且非空的Jasmine测试为时已晚.

我可以通过配置Vim来保存备份文件来解决这个问题,但我真的不想冒这个风险.毕竟,我使用备份文件是有原因的.那么有没有办法告诉Karma“当你检测到文件更改时,暂停N毫秒,然后运行单元测试”？虽然这将是一个蛮力的解决方案,它将解决这种特殊的竞争条件.或者,如果有人提出其他聪明的想法,我也很乐意听到.

解决方法

This GitHub issue也讨论了这个问题.可以将Vim配置为通过复制然后覆盖原始文件来进行备份,而不是移动原始文件并写入新文件.虽然这在技术上不是您问题的答案,但它应该足以解决您的问题：

set backupcopy=yes

Vim现在将编辑文件,Karma会将其检测为“已更改”而不是“已删除”.

有关详细信息,请参阅：help’backupcopy’：

*'backupcopy'* *'bkc'*
'backupcopy' 'bkc'  string  (Vi default for Unix: "yes",otherwise: "auto")
            global
            {not in Vi}
    When writing a file and a backup is made,this option tells how it's
    done.  This is a comma separated list of words.

    The main values are:
    "yes"   make a copy of the file and overwrite the original one
    "no"    rename the file and write a new one
    "auto"  one of the prevIoUs,what works best

原文地址：https://www.jb51.cc/js/157001.html