Migrating to 4.x - TestContext is unknown?

[fdm-mateco]

So, I updated all 3.x packages to 4.x packages.
Building gives me this error:

The type 'TestContext' is defined in an assembly that is not referenced. You must add a reference to assembly 'Microsoft.VisualStudio.TestPlatform.TestFramework.Extensions, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

I cannot find this assembly in the nuget packages.
My project file looks like this:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>

    <IsPackable>false</IsPackable>
    <IsTestProject>true</IsTestProject>
    <OutputType>Library</OutputType>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
    <PackageReference Include="Microsoft.TestPlatform" Version="18.0.1" />
    <PackageReference Include="MSTest.TestAdapter" Version="4.0.2" />
    <PackageReference Include="MSTest.TestFramework" Version="4.0.2" />
  </ItemGroup>

</Project>
```
Any help greatly appreciated.

[Youssef1313]

@fdm-mateco This means that something still has MSTest v3 reference.

First thing to do just to be sure is to do dotnet clean, just in case it's an incremental build issue.
Otherwise, we need a full repro showing the issue.

[fdm-mateco]

It's indeed due to Playwright, which doesn't work with 4.x - I'll log a ticket on their end.

[Youssef1313]

Playwright supports MSTest v4. I answered in microsoft/playwright-dotnet#3265

[fdm-mateco]

wow, thanks so much... sorry for the trouble

[Youssef1313]

Happy to help!