public async Task AddScopeTestAsync()
        {
            const long   newId    = 1L;
            const string newScope = "scope.new";

            await using (var context = NewContext())
            {
                var service = new ScopeService(context);
                await service.AddScopeAsync(new Scope
                {
                    UserId  = newId,
                    ScopeId = newScope
                });

                await context.CommitAsync();
            }

            await using (var context = NewContext())
            {
                var service = new ScopeService(context);
                var result  = await service.HasScopeAsync(newId, new [] { newScope });

                Assert.True(result);
            }
        }