ensures consistent date parsing

Uses `CultureInfo.InvariantCulture` for date parsing in tests to avoid locale-specific issues.

src/GitVersion.Core.Tests/Extensions/StringFormatWithExtensionTests.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using GitVersion.Core.Tests.Helpers;
 using GitVersion.Formatting;
 
@@ -261,7 +262,7 @@ public void FormatAssemblyInformationalVersionWithSemanticVersionCustomFormatted
                 Sha = "commitSha",
                 ShortSha = "commitShortSha",
                 CommitsSinceVersionSource = 42,
-                CommitDate = DateTimeOffset.Parse("2014-03-06 23:59:59Z")
+                CommitDate = DateTimeOffset.Parse("2014-03-06 23:59:59Z", CultureInfo.InvariantCulture)
             }
         };
         const string target = "{Major}.{Minor}.{Patch}-{CommitsSinceVersionSource:0000}";

src/GitVersion.Core.Tests/Formatting/DateFormatterTests.cs

@@ -1,4 +1,5 @@
-using GitVersion.Formatting;
+using System.Globalization;
+using GitVersion.Formatting;
 
 namespace GitVersion.Tests.Formatting;
 
@@ -21,7 +22,7 @@ public void TryFormat_NullValue_ReturnsFalse()
     [TestCase("2021-01-01T12:00:00Z", "yyyy-MM-ddTHH:mm:ssZ", "2021-01-01T12:00:00Z")]
     public void TryFormat_ValidDateFormats_ReturnsExpectedResult(string input, string format, string expected)
     {
-        var date = DateTime.Parse(input);
+        var date = DateTime.Parse(input, CultureInfo.InvariantCulture);
         var sut = new DateFormatter();
         var result = sut.TryFormat(date, format, out var formatted);
         result.ShouldBeTrue();

src/GitVersion.Core.Tests/Formatting/ValueFormatterTests.cs

@@ -33,7 +33,7 @@ public void TryFormat_Number_UsesNumericFormatter()
     [Test]
     public void TryFormat_Date_UsesDateFormatter()
     {
-        var date = new DateTime(2023, 12, 25);
+        var date = new DateTime(2023, 12, 25, 0, 0, 0, DateTimeKind.Utc);
         var result = ValueFormatter.Default.TryFormat(date, "yyyy-MM-dd", out var formatted);
         result.ShouldBeTrue();
         formatted.ShouldBe("2023-12-25");
@@ -42,7 +42,7 @@ public void TryFormat_Date_UsesDateFormatter()
     [Test]
     public void TryFormat_FormattableObject_UsesFormattableFormatter()
     {
-        var value = 123.456m;
+        const decimal value = 123.456m;
         var result = ValueFormatter.Default.TryFormat(value, "C", out var formatted);
         result.ShouldBeTrue();
         formatted.ShouldBe("¤123.46");
@@ -106,7 +106,7 @@ public void Formatters_ExecuteInPriorityOrder()
         formatted.ShouldBe("CUSTOM:test");
     }
 
-    private class TestFormatter : IValueFormatter
+    private sealed class TestFormatter : IValueFormatter
     {
         public int Priority { get; init; }
 

src/GitVersion.Core.Tests/VersionCalculation/VariableProviderTests.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using GitVersion.Configuration;
 using GitVersion.Core.Tests.Helpers;
 using GitVersion.Git;
@@ -301,7 +302,7 @@ public void Format_Allows_CSharp_FormatStrings()
                 Sha = "commitSha",
                 ShortSha = "commitShortSha",
                 CommitsSinceVersionSource = 42,
-                CommitDate = DateTimeOffset.Parse("2014-03-06 23:59:59Z")
+                CommitDate = DateTimeOffset.Parse("2014-03-06 23:59:59Z", CultureInfo.InvariantCulture)
             }
         };