public async Task CreateCustomerTest()
{
var groceryService = new Mock <IDataService>();
var controller = new ValuesController(groceryService.Object);
groceryService
.Setup(x => x.GetCustomerData())
.ReturnsAsync(DefaultCustomerListJSON());
var cust = new Customer {
Id = 3, Name = "Bryan"
};
var result = await controller.CreateCustomer(cust);
Assert.IsType <CreatedAtRouteResult>(result.Result);
}