public void In_memory_DbSet_can_be_used_for_Add()
{
var set = new InMemoryDbSet <Product>();
var product = new Product();
Assert.Same(product, set.Add(product));
Assert.Same(product, set.Single());
}
public void In_memory_DbSet_can_be_used_for_Remove()
{
var set = new InMemoryDbSet <Product>();
var product = new Product();
set.Add(product);
Assert.Same(product, set.Remove(product));
Assert.Empty(set);
}