Examples/GerstITS.Examples.Tests/Shared/Search/Sorting/SortingProviderTest.cs

using AwesomeAssertions;
using GerstITS.Examples.Logic.Customers;
using GerstITS.Examples.Logic.Shared.Search.Sorting;
using GerstITS.Search;
using GerstITS.TestFramework;
using Xunit;

namespace GerstITS.Examples.Tests.Shared.Search.Sorting;

[TestCategory(TestCategories.Unit)]
public sealed class SortingProviderTest
{
    #region Tests

    [Fact]
    public void If_customers_are_sorted_descending___The_order_is_reversed()
    {
        var query = CreateCustomers().AsQueryable();
        var sorting = new CustomerSearchFilter { SortBy = nameof(Customer.LastName), SortDirection = SortingDirections.Descending };

        var sorted = new SortingProvider().Sort(query, sorting);

        sorted.First().LastName.Should().Be("Zimmermann");
    }

    [Fact]
    public void If_the_sort_property_is_unknown___The_query_is_left_unchanged()
    {
        var query = CreateCustomers().AsQueryable();
        var sorting = new CustomerSearchFilter { SortBy = "Unknown" };

        var sorted = new SortingProvider().Sort(query, sorting);

        sorted.Last().LastName.Should().Be("Zimmermann");
    }

    [Fact]
    public void If_the_item_type_is_not_sortable___It_cannot_be_sorted()
    {
        new SortingProvider().CanSort(new[] { "a" }.AsQueryable()).Should().BeFalse();
    }

    #endregion

    #region Methods

    private static IEnumerable<Customer> CreateCustomers()
    {
        return new[]
               {
                   new Customer { FirstName = "Anna", LastName = "Albrecht" },
                   new Customer { FirstName = "Zoe", LastName = "Zimmermann" }
               };
    }

    #endregion
}