如何使用Pester v4将两项网站拦截测试合并为单一成功验证

问题背景 #

使用Pester v4测试特定网站是否被成功拦截时，现有代码对每个黑名单站点执行两个独立测试：验证连接状态码非200、验证连接超时。但实际场景中只要满足任一条件（超时或非200状态码）就应判定站点被拦截，当前逻辑导致同一站点出现一失败一成功的矛盾结果。

原测试代码 #

$PrivacyBlackList = @('nexusrules.live.com', 'auc-visio-telemetry.officeapps.live.com')

Describe '- Check MS Telemetry Compliance' {

  Context '- Get Windows and Office Telemetry' {

    foreach ($BlackSite in $PrivacyBlackList) {

      It "Should not succesfully connect to $BlackSite" {
        $ConnectTest = Invoke-WebRequest -Uri $BlackSite -UseBasicParsing -TimeoutSec 3
        $ConnectTest.StatusCode | Should -Not -Be '200'
      }

      It "Should timeout connecting to $BlackSite" {
        {$ConnectTest = Invoke-WebRequest -Uri $BlackSite -UseBasicParsing -TimeoutSec 3} |
          Should -Throw 'The operation has timed out.'
      }

    }# end foreach
  }
}

当前测试结果 #

Describing - Check MS Telemetry Compliance

  Context - Get Windows and Office Telemetry
    [-] Should not succesfully connect to nexusrules.live.com 3.23s
      WebException: The operation has timed out.
    [+] Should timeout connecting to nexusrules.live.com 3.23s
    [-] Should not succesfully connect to auc-visio-telemetry.officeapps.live.com 2s
      Expected '200' to be different from the actual value, but got the same value.
      9:         $ConnectTest.StatusCode | Should -Not -Be '200'
    [-] Should timeout connecting to auc-visio-telemetry.officeapps.live.com 1.19s
      Expected an exception, with message 'The operation has timed out.' to be thrown, 
      but no exception was thrown.
      14:           Should -Throw 'The operation has timed out.'

解决方案 #

利用try/catch块统一处理连接结果，在单个It块中通过逻辑或判断两种拦截条件，满足其一即判定测试成功：

$PrivacyBlackList = @('nexusrules.live.com', 'auc-visio-telemetry.officeapps.live.com')

Describe '- Check MS Telemetry Compliance' {

  Context '- Get Windows and Office Telemetry' {

    foreach ($BlackSite in $PrivacyBlackList) {

      It "Should be blocked (timeout or non-200 status): $BlackSite" {
        $connectionSuccess = $false
        $timedOut = $false
        
        try {
          $ConnectTest = Invoke-WebRequest -Uri $BlackSite -UseBasicParsing -TimeoutSec 3
          $connectionSuccess = $true
        }
        catch [System.Net.WebException] {
          if ($_.Exception.Message -match 'The operation has timed out\.') {
            $timedOut = $true
          }
          # 其他Web异常（如403/404）也视为拦截成功
        }

        # 满足超时，或连接成功但状态码非200，即判定拦截生效
        ($timedOut -or ($connectionSuccess -and $ConnectTest.StatusCode -ne 200)) | Should -Be $true
      }

    }# end foreach
  }
}

逻辑说明 #

• 通过try/catch捕获Invoke-WebRequest的所有执行情况
• 单独标记超时异常，其他Web异常默认视为拦截成功
• 用PowerShell原生逻辑或（-or）组合两种拦截条件，最终通过Should -Be $true统一判定测试结果

内容的提问来源于stack exchange，提问作者Dennis