Building your code before you can run your tests can be a big part of the time needed to run your tests. The build time inside Visual Studio can vary depending on the kind of changes made to the code. For larger solutions, builds can be the most expensive part of the test run.
Visual Studio 2022 includes an experimental(!) feature, that allow you to use hot reload to speed up the test execution by skipping builds for supported scenarios.
To start using this feature, you first need to enable it by choosing Test > Options > "(Experimental) Enable Hot Reloaded Test Runs for C# and VB test projects targeting .NET 6 and higher":
Now when you execute a test in Visual Studio, Test Explorer will automatically use test execution with hot reload when possible. If a hot reload is not possible, it will fall back to the regular behavior of building and running tests. The nice thing is that this is all happening behind the scenes and you, as a developer, should not do anything different.
Remark: This feature only works when building your projects for the DEBUG configuration
More information: https://docs.microsoft.com/en-us/visualstudio/test/test-execution-with-hot-reload?amp;view=vs-2022