public async Task SearchCustomers_ByPeter_ReturnNone()
        {
            var handler = new SearchCustomersQueryHandler(_context);
            var result  = await handler.Handle(new SearchCustomersQuery("Peter"), CancellationToken.None);

            Assert.Empty(result);
        }
        public async Task SearchCustomers_ByAdam_ReturnTwoCustomers()
        {
            var handler = new SearchCustomersQueryHandler(_context);
            var result  = await handler.Handle(new SearchCustomersQuery("Adam"), CancellationToken.None);

            Assert.Equal(2, result.Count());
        }