public async Task GetSellers_Should_Return_List_Of_Sellers()
{
// Arrange
await _dbContext.Database.EnsureDeletedAsync();
var listOfSellers = new List <tblSellers>();
listOfSellers.Add(new tblSellersBuilder().WithId(1).WithName("Amazon").WithUrl("https://www.amazon.co.uk").Build());
listOfSellers.Add(new tblSellersBuilder().WithId(2).WithName("Ebay").WithUrl("https://www.ebay.co.uk").Build());
listOfSellers.Add(new tblSellersBuilder().WithId(3).WithName("Currys PC World").WithUrl("https://www.currys.co.uk").Build());
_dbContext.tblSellers.AddRange(listOfSellers);
await _dbContext.SaveChangesAsync();
// Act
var task = _userSettingsService.GetSellers();
var result = task.Result;
Assert.IsAssignableFrom <IEnumerable <Seller> >(result);
Assert.Equal(3, result.Count());
}