Unit testing Azure DevOps服务器：为什么VisualStudio测试步骤要花这么长时间来运行单元测试？

在本地安装的构建系统中，我有一个带有。该步骤配置为在DLL中发现和运行单元测试

该步骤是通过GUI定义的。以下是它的特性：

Version: 2.*
Select tests using: Test assemblies
Test files:
    **\*test*.dll
    !**\*TestAdapter.dll
    !**\obj\**
Search folder: $(System.DefaultWorkingDirectory)
Select test platform using: Version
Test platform version: Latest

该步骤成功运行并通过，确定了18个测试。然而，这样做需要花费不合理的时间：~51秒

运行日志显示，它在启动

vstest.console.exe

之前大约花费了40秒，似乎什么也没做。请参阅完整日志中的这一行，如下所示：

2019-09-23T07:11:35.7961563Z ========================================================

我的问题-为什么VisualStudio测试步骤要花这么多时间空闲？我能做些什么来减少浪费时间

更新1：作为实验，我创建了一个新的git repo，它只包含我的解决方案构建的（~100）个DLL。我创建了一个新的管道，它只拉取这些DLL并运行单元测试。当我运行这个时，它运行得更快。特别是日志中最初需要40秒的两行现在不到一秒

更新2：我试图通过指定测试DLL的完整路径并从“测试文件”属性中删除所有

**

模式来加快速度。这一步仍然像以前一样慢

---

---

根本原因是在

搜索文件夹中有超过100000个文件供Visual Studio步骤扫描测试

为了解决这个问题，我将搜索文件夹指向文件夹树下更具体的bin文件夹。这减少了扫描的文件数量，大大缩短了该步骤的总体运行时间。
是否每次都需要大约40秒的时间？@levi lu msft谢谢。是的，每次跑步的时间都是一样的。另外，我刚刚添加了一个问题的更新。您可以打开
system.debug
来检查vstest实际执行的详细信息，看起来在源过滤器中搜索test.dll会阻止执行。您可以尝试将搜索文件夹缩小到
bin/release
文件夹，或指定详细的测试dll文件位置以节省时间。例如，
$（System.DefaultWorkingDirectory）\***\$（BuildConfiguration）\*Test*.dll
@LeviLu-MSFT谢谢。请看我的“更新2”。我删除了
**
模式，并替换为测试DLL的精确路径。仍然运行缓慢。现在将尝试启用调试日志并报告。我看到您在自托管代理上运行这些测试，您可以尝试在其他代理或microsoft托管代理上运行这些测试，以检查是否是由于代理的低性能造成的。
2019-09-23T07:11:32.4121152Z ##[section]Starting: run unit tests
2019-09-23T07:11:32.4135871Z ==============================================================================
2019-09-23T07:11:32.4136477Z Task         : Visual Studio Test
2019-09-23T07:11:32.4136755Z Description  : Run unit and functional tests (Selenium, Appium, Coded UI test, etc.) using the Visual Studio Test (VsTest) runner. Test frameworks that have a Visual Studio test adapter such as MsTest, xUnit, NUnit, Chutzpah (for JavaScript tests using QUnit, Mocha and Jasmine), etc. can be run. Tests can be distributed on multiple agents using this task (version 2).
2019-09-23T07:11:32.4137066Z Version      : 2.143.8
2019-09-23T07:11:32.4137295Z Author       : Microsoft Corporation
2019-09-23T07:11:32.4137526Z Help         : [More information](https://go.microsoft.com/fwlink/?LinkId=835764)
2019-09-23T07:11:32.4138042Z ==============================================================================
2019-09-23T07:11:35.0894195Z SystemVssConnection exists true
2019-09-23T07:11:35.0937440Z SystemVssConnection exists true
2019-09-23T07:11:35.2406351Z Running tests using vstest.console.exe runner.
2019-09-23T07:11:35.2407337Z ======================================================
2019-09-23T07:11:35.2408408Z Test selector : Test assemblies
2019-09-23T07:11:35.2409125Z Test filter criteria : null
2019-09-23T07:11:35.2409694Z Search folder : C:\pool\_work\238\s
2019-09-23T07:11:35.2412135Z VisualStudio version selected for test execution : latest
2019-09-23T07:11:35.2758339Z Run in parallel : false
2019-09-23T07:11:35.2810059Z Run in isolation : false
2019-09-23T07:11:35.2813902Z Path to custom adapters : null
2019-09-23T07:11:35.2831140Z Other console options : null
2019-09-23T07:11:35.2883526Z Code coverage enabled : false
2019-09-23T07:11:35.2884892Z Diagnostics enabled : false
2019-09-23T07:11:35.2937817Z SystemVssConnection exists true
2019-09-23T07:11:35.3039161Z Run the tests locally using vstest.console.exe
2019-09-23T07:11:35.3040102Z ========================================================
2019-09-23T07:11:35.3075806Z Test selector : Test assemblies
2019-09-23T07:11:35.3094635Z Test assemblies : **\*test*.dll,!**\*TestAdapter.dll,!**\obj\**
2019-09-23T07:11:35.3095999Z Test filter criteria : null
2019-09-23T07:11:35.3114780Z Search folder : C:\pool\_work\238\s
2019-09-23T07:11:35.3125782Z Run settings file : C:\pool\_work\238\s
2019-09-23T07:11:35.3144368Z Run in parallel : false
2019-09-23T07:11:35.3158394Z Run in isolation : false
2019-09-23T07:11:35.3243577Z Path to custom adapters : null
2019-09-23T07:11:35.3244967Z Other console options : null
2019-09-23T07:11:35.3269743Z Code coverage enabled : false
2019-09-23T07:11:35.3273300Z Diagnostics enabled : false
2019-09-23T07:11:35.3286973Z Rerun failed tests: false
2019-09-23T07:11:35.3308152Z VisualStudio version selected for test execution : latest
2019-09-23T07:11:35.7961563Z ========================================================
2019-09-23T07:11:50.3641983Z ======================================================
2019-09-23T07:12:16.2956956Z [command]"C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe" @C:\pool\_work\_temp\60ff2cb1-ddd1-11e9-a3ed-db0a48eb3ef5.txt
2019-09-23T07:12:16.9940929Z Microsoft (R) Test Execution Command Line Tool Version 15.9.0
2019-09-23T07:12:16.9941829Z Copyright (c) Microsoft Corporation.  All rights reserved.
2019-09-23T07:12:16.9942101Z 
2019-09-23T07:12:16.9942399Z vstest.console.exe 
2019-09-23T07:12:16.9942679Z "C:\pool\_work\238\s\REDACTED\bin\Release\REDACTED.Tests.dll"
2019-09-23T07:12:16.9942954Z /logger:"trx"
2019-09-23T07:12:16.9943238Z /TestAdapterPath:"C:\pool\_work\238\s"
2019-09-23T07:12:17.6998070Z Starting test execution, please wait...
2019-09-23T07:12:20.5147395Z [xUnit.net 00:00:00.6296658]   Discovering: REDACTED.Tests
2019-09-23T07:12:20.6880418Z [xUnit.net 00:00:00.8113825]   Discovered:  REDACTED.Tests
2019-09-23T07:12:20.6955571Z [xUnit.net 00:00:00.8192449]   Starting:    REDACTED.Tests
2019-09-23T07:12:21.9022641Z Passed   REDACTED 1
2019-09-23T07:12:21.9024375Z Passed   REDACTED 2
2019-09-23T07:12:21.9024811Z Passed   REDACTED 3
2019-09-23T07:12:21.9025086Z Passed   REDACTED 4
2019-09-23T07:12:21.9025460Z Passed   REDACTED 5
2019-09-23T07:12:21.9026429Z Passed   REDACTED 6
2019-09-23T07:12:21.9027211Z Passed   REDACTED 7
2019-09-23T07:12:21.9027581Z Passed   REDACTED 8
2019-09-23T07:12:21.9027938Z Passed   REDACTED 9
2019-09-23T07:12:21.9028266Z [xUnit.net 00:00:01.9910390]   Finished:    REDACTED.Tests
2019-09-23T07:12:22.3918748Z Passed   REDACTED 10
2019-09-23T07:12:22.3920336Z Passed   REDACTED 11
2019-09-23T07:12:22.3920912Z Passed   REDACTED 12
2019-09-23T07:12:22.3922185Z Passed   REDACTED 13
2019-09-23T07:12:22.3923090Z Passed   REDACTED 14
2019-09-23T07:12:22.3925098Z Passed   REDACTED 15
2019-09-23T07:12:22.3926473Z Passed   REDACTED 16
2019-09-23T07:12:22.3928334Z Passed   REDACTED 17
2019-09-23T07:12:22.3930288Z Passed   REDACTED 18
2019-09-23T07:12:22.4707999Z Results File: C:\pool\_work\238\s\TestResults\REDACTED_2019-09-23_10_12_21.trx
2019-09-23T07:12:22.4743977Z 
2019-09-23T07:12:22.4746692Z Total tests: 18. Passed: 18. Failed: 0. Skipped: 0.
2019-09-23T07:12:22.4748446Z Test Run Successful.
2019-09-23T07:12:22.4764305Z Test execution time: 2.7962 Seconds
2019-09-23T07:12:23.0702219Z ##[section]Async Command Start: Publish test results
2019-09-23T07:12:23.3336706Z Publishing test results to test run '432'
2019-09-23T07:12:23.3338983Z Test results remaining: 18. Test run id: 432
2019-09-23T07:12:24.1461381Z Published Test Run : http://REDACTED/Runs#runId=432&_a=runCharts
2019-09-23T07:12:24.1474239Z ##[section]Async Command End: Publish test results
2019-09-23T07:12:24.1476508Z ##[section]Finishing: run unit tests