Unable to find testhost.dll. Please publish your test project and retry

Question

I have a simple dotnet core class library with a single XUnit test method:

TestLib.csproj:


  
            


        

Answer 1

I've encountered this a couple of times and I always forget what's up. Most recently I had:

• Class Library -> Targeting .NET Core 3.0
• Test Project -> Targeting .NET Core 3.1

Packages for my test project:

• Moq -> 4.14.1
• xUnit -> 2.4.1
• xUnit.Runner.VisualStudio -> 2.4.2

I was seeing:

Unable to find C:\PATH\bin\Debug\netstandard2.0\testhost.dll. Please publish your test project and retry.

And all that I needed to do was add to my test project the missing nuget package: "Microsoft.NET.Test.SDK"

Everything was back to normal at this point.