/**
  * Fill Travis CI environment variables.
  *
  * "TRAVIS", "TRAVIS_JOB_ID" must be set.
  *
  * @return \Satooshi\Bundle\CoverallsV1Bundle\Collector\CiEnvVarsCollector
  */
 protected function fillTravisCi()
 {
     if (isset($this->env['TRAVIS']) && $this->env['TRAVIS'] && isset($this->env['TRAVIS_JOB_ID'])) {
         $this->env['CI_JOB_ID'] = $this->env['TRAVIS_JOB_ID'];
         if ($this->config->hasServiceName()) {
             $this->env['CI_NAME'] = $this->config->getServiceName();
         } else {
             $this->env['CI_NAME'] = 'travis-ci';
         }
         // backup
         $this->readEnv['TRAVIS'] = $this->env['TRAVIS'];
         $this->readEnv['TRAVIS_JOB_ID'] = $this->env['TRAVIS_JOB_ID'];
         $this->readEnv['CI_NAME'] = $this->env['CI_NAME'];
     }
     return $this;
 }