public async Task AddCarrierShouldCreateNewCarrierIfItDoesntExist()
{
var options = new DbContextOptionsBuilder <WHMSDbContext>().UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options;
using var context = new WHMSDbContext(options);
var mockInventoryService = new Mock <IInventoryService>();
var service = new ShippingService(context, mockInventoryService.Object);
var carrierName = "FedEx";
await service.AddCarrierAsync(carrierName);
var carrierDb = context.Carriers.FirstOrDefault();
Assert.NotNull(carrierDb);
Assert.Equal(carrierName, carrierDb.Name);
}
