使用“无法启动PhantomJS”错误测试成功

Question

我通过NodeJS v0.10.11通过karma和grunt测试得到了最奇怪的错误。

最初，由于PhantomJS没有启动，测试不会运行。更新NodeJS后，我明白了：

[2013-06-19 03:16:12.743] [DEBUG] config - autoWatch set to false, because of singleRun
INFO [karma]: Karma server started at http://localhost:8080/
INFO [launcher]: Starting browser PhantomJS
INFO [PhantomJS 1.9 (Linux)]: Connected on socket id KVDuQs5niBzzc8KQSnFm
PhantomJS 1.9 (Linux): Executed 1 of 1 SUCCESS (0.327 secs / 0.041 secs)
ERROR [launcher]: Cannot start PhantomJS

为什么测试成功运行后会出错？

更新：添加代码

Gruntfile业力任务：

karma: {
      unit: {
        configFile: 'karma.conf.js',
        singleRun: true
      },
      e2e: {
        configFile: 'karma-e2e.conf.js',
        singleRun: true
      }
    }

karma.conf.js

// Karma configuration

// base path, that will be used to resolve files and exclude
basePath = '';

// list of files / patterns to load in the browser
// removed the following because of warning 'test/mock/**/*.js',
files = [
  JASMINE,
  JASMINE_ADAPTER,
  'app/components/angular/angular.js',
  'app/components/angular-mocks/angular-mocks.js',
  'app/scripts/*.js',
  'app/scripts/**/*.js',
  'test/spec/**/*.js'
];

// list of files to exclude
exclude = [];

// test results reporter to use
// possible values: dots || progress || growl
reporters = ['progress'];

// web server port
port = 8080;

// cli runner port
runnerPort = 9100;

// enable / disable colors in the output (reporters and logs)
colors = true;

// level of logging
// possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
logLevel = LOG_INFO;

// enable / disable watching file and executing tests whenever any file changes
autoWatch = false;

// Start these browsers, currently available:
// - Chrome
// - ChromeCanary
// - Firefox
// - Opera
// - Safari (only Mac)
// - PhantomJS
// - IE (only Windows)
browsers = ['PhantomJS'];

// If browser does not capture in given timeout [ms], kill it
captureTimeout = 5000;

// Continuous Integration mode
// if true, it capture browsers, run tests and exit
singleRun = false;