error NU1100: Unable to resolve in Module "Run quality tests"

[svenvandeschoot]

I'm working through the Azure DevOps modules and I've come to a roadblock on https://learn.microsoft.com/en-us/training/modules/run-quality-tests-build-pipeline/4-add-unit-tests

I fetch the upstream branch, do a checkout and then proceed to the subsection "Run the tests locally" where I get a bunch of errors (see below). I have no idea on how to proceed to fix this, and am blocked for the remainder of the course :/

`$ dotnet build --configuration Release
MSBuild version 17.3.2+561848881 for .NET
Determining projects to restore...
C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.Tests\Tailspin.SpaceGame.Web.Tests.csproj : error NU1100: Unable to resolve 'nunit (>= 3.13.2)' for 'net6.0'.
[C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.sln]
C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.Tests\Tailspin.SpaceGame.Web.Tests.csproj : error NU1100: Unable to resolve 'NUnit3TestAdapter (>= 3.17.0)' f
or 'net6.0'. [C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.sln]
C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.Tests\Tailspin.SpaceGame.Web.Tests.csproj : error NU1100: Unable to resolve 'Microsoft.NET.Test.Sdk (>= 16.10
.0)' for 'net6.0'. [C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.sln]
Failed to restore C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.Tests\Tailspin.SpaceGame.Web.Tests.csproj (in 120 ms).
1 of 2 projects are up-to-date for restore.

Build FAILED.

C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.Tests\Tailspin.SpaceGame.Web.Tests.csproj : error NU1100: Unable to resolve 'nunit (>= 3.13.2)' for 'net6.0'.
[C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.sln]
C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.Tests\Tailspin.SpaceGame.Web.Tests.csproj : error NU1100: Unable to resolve 'NUnit3TestAdapter (>= 3.17.0)' f
or 'net6.0'. [C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.sln]
C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.Tests\Tailspin.SpaceGame.Web.Tests.csproj : error NU1100: Unable to resolve 'Microsoft.NET.Test.Sdk (>= 16.10
.0)' for 'net6.0'. [C:\Workdir\MyApps\repo\mslearn-tailspin-spacegame-web\Tailspin.SpaceGame.Web.sln]
0 Warning(s)
3 Error(s)

Time Elapsed 00:00:00.61`

[svenvandeschoot]

I'm not sure if this was the right fix, but I found a Reddit post concerning a similar issue and they recommended checking the nuget source. It turns out I didn't have one, and after entering the commands below, my dotnet build worked first try.

I hope mslearn picks this up to correct the course module prerequisites, or at the very least it helps someone at some point.

$ dotnet nuget list source
No sources found.

$ dotnet nuget add source --name nuget.org https://api.nuget.org/v3/index.json
Package source with Name: nuget.org added successfully.

$ dotnet nuget list source
Registered Sources:

1. nuget.org [Enabled]
   https://api.nuget.org/v3/index.json

[redflAg00]

Thank you very much! I had the exact same error and your solution fixed it for me.
I too hope MS will review their MS-Learn repos more regularly as i stumbled on a few errors, which i was able to fix, thx to this awesome community.

[dholyfield]

another thanks coming your way, this fixed the issue for me as well