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5 changes: 5 additions & 0 deletions src/Basket.API/Model/BasketItem.cs
Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,11 @@ public IEnumerable<ValidationResult> Validate(ValidationContext validationContex
results.Add(new ValidationResult("Invalid number of units", new[] { "Quantity" }));
}

if (UnitPrice < 0)
{
results.Add(new ValidationResult("Unit price must be greater than or equal to zero", new[] { "UnitPrice" }));
}

return results;
}
}