Running dotnet test on a net6 unit test project that references a project using .NET MAUI (<UseMaui>true</UseMaui>) throws the following error:
Testhost process exited with error: It was not possible to find any compatible framework version
The framework 'Microsoft.Maui.Core', version '**FromWorkload**' (x64) was not found.
This error is happening with .NET 6 Release Candidate 2
This is a known-issue in .NET 6 RC2:
https://github.com/dotnet/sdk/issues/21845
Currently, dotnet test does not yet work for projects using dotnet workloads. Since .NET MAUI is installed as a .NET Workload, this means that dotnet test will not yet work for .NET MAUI apps.
Update: The .NET MAUI team has fixed the issue. This means using dotnet test on .NET MAUI projects will begin working in the next release, .NET MAUI Preview 10.