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TierPriceExtensionTests.cs

using FluentAssertions;
using Nop.Core.Domain.Catalog;
using Nop.Services.Catalog;
using NUnit.Framework;

namespace Nop.Tests.Nop.Services.Tests.Catalog;

[TestFixture]
public class TierPriceExtensionTests
{
    [Test]
    public void CanRemoveDuplicatedQuantities()
    {
        var tierPrices = new List
        {
            new() {
                //will be removed
                Id = 1,
                Price = 150,
                Quantity = 1
            },
            new() {
                //will stay
                Id = 2,
                Price = 100,
                Quantity = 1
            },
            new() {
                //will stay
                Id = 3,
                Price = 200,
                Quantity = 3
            },
            new() {
                //will stay
                Id = 4,
                Price = 250,
                Quantity = 4
            },
            new() {
                //will be removed
                Id = 5,
                Price = 300,
                Quantity = 4
            },
            new() {
                //will stay
                Id = 6,
                Price = 350,
                Quantity = 5
            }
        };

        tierPrices = tierPrices.RemoveDuplicatedQuantities().ToList();

        tierPrices.FirstOrDefault(x => x.Id == 1).Should().BeNull();
        tierPrices.FirstOrDefault(x => x.Id == 2).Should().NotBeNull();
        tierPrices.FirstOrDefault(x => x.Id == 3).Should().NotBeNull();
        tierPrices.FirstOrDefault(x => x.Id == 4).Should().NotBeNull();
        tierPrices.FirstOrDefault(x => x.Id == 5).Should().BeNull();
        tierPrices.FirstOrDefault(x => x.Id == 6).Should().NotBeNull();
    }
}