There is error in .TestBase project in Security/FakeCurrentPrincipalAccessor.cs.
There is ICurrentPrincipalAccessor with IDisposable Change(ClaimsPrincipal principal) method, which is not declared (and implemented) in FakeCurrentPrincipalAccessor.cs.
How this issue is closed if there is still error?
Your should now inherit ThreadCurrentPrincipalAccessor.
Oh, I see now.
Most helpful comment
Your should now inherit
ThreadCurrentPrincipalAccessor.