AppDomain.CurrentDomain.GetAssemblies() didn't give the project reference

I have many projects in my solutions (.net core).

API and Web.Framework are used by API.IntegrationTest project. When I compile solution, dll files of API and Web.Framework are created in API.IntegrationTest but while API.IntegrationTest is running, I can't reach those dll files. To do this, I use AppDomain.CurrentDomain.GetAssemblies() method and I'm sure and see dll files in domain folder but they don't come using AppDomain.CurrentDomain.GetAssemblies(). Is there anyone who has any theory about this scenario?