Cannot run .net 5 unit tests

[acsyanqinglu]

Description

Getting the following error when run unit test in azure pipeline:
2023-03-17T15:49:01.9977122Z ##[error]Testhost process exited with error: You must install or update .NET to run this application.
2023-03-17T15:49:01.9980337Z ##[error]App: D:\a\1\s\ACS.DP.SocietyDonationsBatching\Tests\bin\Debug\net5.0\testhost.exe
2023-03-17T15:49:01.9983986Z ##[error]Architecture: x64
2023-03-17T15:49:01.9986249Z ##[error]Framework: 'Microsoft.AspNetCore.App', version '5.0.0' (x64)
2023-03-17T15:49:01.9988850Z ##[error].NET location: C:\Program Files\dotnet
2023-03-17T15:49:01.9991495Z ##[error]The following frameworks were found:
2023-03-17T15:49:01.9993964Z ##[error] 3.1.4 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
2023-03-17T15:49:01.9996627Z ##[error] 3.1.6 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
2023-03-17T15:49:01.9999296Z ##[error] 3.1.20 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
2023-03-17T15:49:02.0001959Z ##[error] 3.1.32 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
2023-03-17T15:49:02.0004724Z ##[error] 6.0.5 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
2023-03-17T15:49:02.0007661Z ##[error] 6.0.14 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
2023-03-17T15:49:02.0008964Z ##[error]Learn about framework resolution:
2023-03-17T15:49:02.0010185Z ##[error]https://aka.ms/dotnet/app-launch-failed
2023-03-17T15:49:02.0012407Z ##[error]To install missing framework, download:
2023-03-17T15:49:02.0014890Z ##[error]https://aka.ms/dotnet-core-applaunch?framework=Microsoft.AspNetCore.App&framework_version=5.0.0&arch=x64&rid=win10-x64
2023-03-17T15:49:02.0018063Z ##[error]. Please check the diagnostic logs for more information.
2023-03-17T15:49:02.3181331Z Results File: D:\a_temp\TestResults\VssAdministrator_WIN-PKB0999TB7N_2023-03-17_15_49_02.trx
2023-03-17T15:49:02.3290419Z Attachments:
2023-03-17T15:49:02.3291217Z D:\a_temp\TestResults\98b6949a-8c9f-4213-97fd-7f78dd2f6f40\VssAdministrator_WIN-PKB0999TB7N_2023-03-17.15_49_01.coverage
2023-03-17T15:49:02.3414521Z ##[error]Test Run Aborted.
2023-03-17T15:49:02.3690570Z Vstest.console.exe exited with code 1.

Platforms affected

• Azure DevOps
• GitHub Actions - Standard Runners
• GitHub Actions - Larger Runners

Runner images affected

• Ubuntu 18.04
• Ubuntu 20.04
• Ubuntu 22.04
• macOS 11
• macOS 12
• Windows Server 2019
• Windows Server 2022

Image version and build link

Image: windows-2019
Version: 20230314.1
Included Software: https://github.com/actions/runner-images/blob/win19/20230314.1/images/win/Windows2019-Readme.md
Image Release: https://github.com/actions/runner-images/releases/tag/win19%2F20230314.1

Is it regression?

no

Expected behavior

Expect .net 5 framework should exist and unit test runs

Actual behavior

Expect .net 5 framework doesn't exist and unit test fails

Repro steps

**************** Starting test execution *********************
C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\Extensions\TestPlatform\vstest.console.exe "@d:\a_temp\0gx5qupi5ed.tmp"
Microsoft (R) Test Execution Command Line Tool Version 16.11.0
Copyright (c) Microsoft Corporation. All rights reserved.
vstest.console.exe "D:\a\1\s\ACS.DP.SocietyDonationsBatching\Tests\bin\Debug\net5.0\Tests.dll"
/TestCaseFilter:"TestCategory=System"
/Settings:"D:\a_temp\z4kdc0ctpgj.tmp.runsettings"
/EnableCodeCoverage
/Logger:"trx"
/TestAdapterPath:"D:\a\1\s"
Starting test execution, please wait...
3.279
A total of 1 test files matched the specified pattern.
##[error]Testhost process exited with error: You must install or update .NET to run this application.
##[error]App: D:\a\1\s\ACS.DP.SocietyDonationsBatching\Tests\bin\Debug\net5.0\testhost.exe
##[error]Architecture: x64
##[error]Framework: 'Microsoft.AspNetCore.App', version '5.0.0' (x64)
##[error].NET location: C:\Program Files\dotnet
##[error]The following frameworks were found:
##[error] 3.1.4 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
##[error] 3.1.6 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
##[error] 3.1.20 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
##[error] 3.1.32 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
##[error] 6.0.5 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
##[error] 6.0.14 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
##[error]Learn about framework resolution:
##[error]https://aka.ms/dotnet/app-launch-failed
##[error]To install missing framework, download:

[acsyanqinglu]

Why was .net 5 framework removed from azure build pipeline? How to get it back?

[erik-bershel]

@acsyanqinglu it is not a bug. Version 5.0 of .net framework was removed from images due to reaching EOL. Read more here: #6840.