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

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+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
+}

GerstITS.Examples.Tests/Shared/Validation/IdValidationRuleTest.cs

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+using AwesomeAssertions;
+using GerstITS.Examples.Logic.Shared.Validation;
+using GerstITS.TestFramework;
+using Xunit;
+
+namespace GerstITS.Examples.Tests.Shared.Validation;
+
+[TestCategory(TestCategories.Unit)]
+public sealed class IdValidationRuleTest
+{
+    #region Tests
+
+    [Fact]
+    public void If_the_id_is_positive___It_is_valid()
+    {
+        var result = new IdValidationRule().Validate((object)1);
+
+        result.IsValid.Should().BeTrue();
+    }
+
+    [Fact]
+    public void If_the_id_is_zero___It_is_invalid()
+    {
+        var result = new IdValidationRule().Validate((object)0);
+
+        result.IsValid.Should().BeFalse();
+    }
+
+    #endregion
+}