Multiple projects with tests in single test session

[jorgeparavicini]

We have many different projects that currently reference TUnit.Engine. Each of those test projects creates containers using TestContainers, which takes some time to start. We want to reuse those TestContainers. However, it seems that TUnit runs each project independently. Is there a way to define tests in a separate assembly and then reference them in a single project where all tests can be run in a single session?

I've tried changing the existing projects' dependency to TUnit.Core and creating a new empty project that references both these projects and TUnit.Engine. Unfortunately, the tests are no longer found in this case.

[thomhurst]

Probably due to how .NET loads assemblies. My understanding is an assembly only gets loaded when a type or something from it is first referenced.

In your main project that will be the runner, try creating a [Before(TestDiscovery)] and then inside it reference types from your referencing projects. Even a console write line should do it.

E.g.

Console.WriteLine($"Loading assembly {typeof(SomeType).Assembly}"

[jorgeparavicini]

Yep that worked, thanks for the quick answer