refactor: SignContractTestData and update global usings

Simplified the SignContractTestData class by changing it from a list of object arrays to inherit from TheoryData. Removed unnecessary implementation of IEnumerator. In the GlobalUsings.cs file, removed an unused global using declaration.

Author: kamilbaczek

Chapter-3-microservice-extraction/Fitnet.Contracts/Src/Fitnet.Contracts.Core.UnitTests/GlobalUsings.cs

@@ -1,3 +1,2 @@
-global using System.Collections;
 global using FluentAssertions;
-global using Xunit;
+global using Xunit;

Chapter-3-microservice-extraction/Fitnet.Contracts/Src/Fitnet.Contracts.Core.UnitTests/SignContract/SignContractTestData.cs

@@ -1,30 +1,26 @@
 namespace EvolutionaryArchitecture.Fitnet.Contracts.Core.UnitTests.SignContract;
 
-internal sealed class SignContractTestData : IEnumerable<object[]>
+internal sealed class SignContractTestData : TheoryData<DateTimeOffset, DateTimeOffset, DateTimeOffset, DateTimeOffset>
 {
-    private readonly List<object[]> _data =
-    [
-        [
+    public SignContractTestData()
+    {
+        AddRow(
             new DateTimeOffset(2021, 1, 1, 1, 1, 1, TimeSpan.Zero),
             new DateTimeOffset(2021, 1, 1, 1, 1, 1, TimeSpan.Zero),
             new DateTimeOffset(2021, 1, 1, 1, 1, 1, TimeSpan.Zero),
             new DateTimeOffset(2022, 1, 1, 1, 1, 1, TimeSpan.Zero)
-        ],
-        [
+        );
+        AddRow(
             new DateTimeOffset(2022, 6, 1, 12, 0, 0, TimeSpan.Zero),
             new DateTimeOffset(2022, 6, 1, 12, 0, 0, TimeSpan.Zero),
             new DateTimeOffset(2022, 6, 1, 12, 0, 0, TimeSpan.Zero),
             new DateTimeOffset(2023, 6, 1, 12, 0, 0, TimeSpan.Zero)
-        ],
-        [
+        );
+        AddRow(
             new DateTimeOffset(2023, 2, 15, 8, 30, 0, TimeSpan.Zero),
             new DateTimeOffset(2023, 2, 15, 8, 30, 0, TimeSpan.Zero),
             new DateTimeOffset(2023, 2, 15, 8, 30, 0, TimeSpan.Zero),
             new DateTimeOffset(2024, 2, 15, 8, 30, 0, TimeSpan.Zero)
-        ]
-    ];
-
-    public IEnumerator<object[]> GetEnumerator() => _data.GetEnumerator();
-
-    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        );
+    }
 }