Nullability of reference types in type of parameter 'keyValues' doesn't match overridden member.

'FakeDbSet<T>.GetAsyncEnumerator(CancellationToken)' hides inherited member 'DbSet<T>.GetAsyncEnumerator(CancellationToken)'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

Type parameter 'T' has the same name as the type parameter from outer type 'FakeDbSet<T>'

Dereference of a possibly null reference.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.