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TaxServiceTests.cs

using FluentAssertions;
using Nop.Core.Domain.Catalog;
using Nop.Core.Domain.Customers;
using Nop.Core.Domain.Tax;
using Nop.Services.Configuration;
using Nop.Services.Customers;
using Nop.Services.Tax;
using NUnit.Framework;

namespace Nop.Tests.Nop.Services.Tests.Tax;

[TestFixture]
public class TaxServiceTests : ServiceTest
{
    private TaxSettings _taxSettings;
    private bool _defaultEuVatAssumeValid;
    private ITaxPluginManager _taxPluginManager;
    private ISettingService _settingService;
    private ITaxService _taxService;
    private ICustomerService _customerService;
    private bool _defaultAdminRoleTaxExempt;
    private bool _defaultAdminTaxExempt;
    private bool _defaultEuVatUseWebService;

    [OneTimeSetUp]
    public async Task SetUp()
    {
        _settingService = GetService();
        _taxSettings = GetService();
        _defaultEuVatUseWebService = _taxSettings.EuVatUseWebService;
        _defaultEuVatAssumeValid = _taxSettings.EuVatAssumeValid;
        _taxSettings.EuVatAssumeValid = false;
        _taxSettings.EuVatUseWebService = true;

        await _settingService.SaveSettingAsync(_taxSettings);

        _taxService = GetService();
        _taxPluginManager = GetService();
            
            
        _customerService = GetService();

        var adminRole = await _customerService.GetCustomerRoleBySystemNameAsync(NopCustomerDefaults.AdministratorsRoleName);
        _defaultAdminRoleTaxExempt = adminRole.TaxExempt;
        var admin = await _customerService.GetCustomerByEmailAsync(NopTestsDefaults.AdminEmail);
        _defaultAdminTaxExempt = admin.IsTaxExempt;
    }

    [OneTimeTearDown]
    public async Task TearDown()
    {
        _taxSettings.EuVatAssumeValid = _defaultEuVatAssumeValid;
        _taxSettings.EuVatUseWebService = _defaultEuVatUseWebService;

        await _settingService.SaveSettingAsync(_taxSettings);

        var adminRole = await _customerService.GetCustomerRoleBySystemNameAsync(NopCustomerDefaults.AdministratorsRoleName);
        adminRole.TaxExempt = _defaultAdminRoleTaxExempt;
        adminRole.Active = true;
        await _customerService.UpdateCustomerRoleAsync(adminRole);

        var admin = await _customerService.GetCustomerByEmailAsync(NopTestsDefaults.AdminEmail);
        admin.IsTaxExempt = _defaultAdminTaxExempt;
        await _customerService.UpdateCustomerAsync(admin);
    }

    [Test]
    public async Task CanLoadTaxProviders()
    {
        var providers = await _taxPluginManager.LoadAllPluginsAsync();
        providers.Should().NotBeNull();
        providers.Any().Should().BeTrue();
    }

    [Test]
    public async Task CanLoadTaxProviderBySystemKeyword()
    {
        var provider = await _taxPluginManager.LoadPluginBySystemNameAsync("FixedTaxRateTest");
        provider.Should().NotBeNull();
    }

    [Test]
    public async Task CanLoadActiveTaxProvider()
    {
        var provider = await _taxPluginManager.LoadPrimaryPluginAsync();
        provider.Should().NotBeNull();
    }

    [Test]
    public async Task CanGetProductPricePriceIncludesTaxIncludingTaxTaxable()
    {
        var customer = new Customer();
        var product = new Product();

        var (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, true, customer, true);
        price.Should().Be(1000);
        (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, true, customer, false);
        price.Should().Be(1100);
        (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, false, customer, true);
        price.Should().Be(909.0909090909090909090909091M);
        (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, false, customer, false);
        price.Should().Be(1000);
    }

    [Test]
    public async Task CanGetProductPrice()
    {
        var product = new Product();
        var customer = new Customer();

        var (price, _) = await _taxService.GetProductPriceAsync(product, 1000M);
        price.Should().Be(1000);
        (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, true, customer, true);
        price.Should().Be(1000);
    }

    [Test]
    public async Task CanGetProductPricePriceIncludesTaxIncludingTaxNonTaxable()
    {
        var customer = new Customer();
        var product = new Product();

        //not taxable
        customer.IsTaxExempt = true;

        var (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, true, customer, true);
        price.Should().Be(909.0909090909090909090909091M);
        (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, true, customer, false);
        price.Should().Be(1000);
        (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, false, customer, true);
        price.Should().Be(909.0909090909090909090909091M);
        (price, _) = await _taxService.GetProductPriceAsync(product, 0, 1000M, false, customer, false);
        price.Should().Be(1000);
    }

    [Test]
    [TestCase("GB731331179", VatNumberStatus.Valid)]
    [TestCase("NO974761076", VatNumberStatus.Unknown)]
    [TestCase("GB430479893", VatNumberStatus.Invalid)]
    [TestCase("IT00478390347", VatNumberStatus.Valid)]
    public async Task CanCheckVatNumber(string vatNumber, VatNumberStatus canBeStatus)
    {
        var result = await _taxService.GetVatNumberStatusAsync(vatNumber);

        result.vatNumberStatus.Should().Be(canBeStatus);
    }
}