Timestamps honor timezone Pt. 2 (#109)

* Tests

* Fix

Author: gfoidl

source/trx2junit.Core/Extensions/TimeExtensions.cs

@@ -33,7 +33,13 @@ public static string ToTrxDateTime(this DateTimeOffset dt)
             value.Millisecond.TryFormat(buffer.Slice(20), out int written, "000");
             Debug.Assert(written == 3);
 
-            value.Offset.Hours.TryFormat(buffer.Slice(24), out written, "00");
+            int offsetHours = value.Offset.Hours;
+            if (offsetHours < 0)
+            {
+                buffer[23] = '-';
+                offsetHours = -offsetHours;
+            }
+            offsetHours.TryFormat(buffer.Slice(24), out written, "00");
             Debug.Assert(written == 2);
         });
     }

tests/trx2junit.Core.Tests/Extensions/TimeExtensionsTests/ParseDateTime.cs

@@ -52,9 +52,9 @@ public void Brute_force_validation()
     }
     //-------------------------------------------------------------------------
     [Test]
-    public void Valid_TrxDateTime___OK()
+    public void Valid_TrxDateTime___OK([Values(-1, 0, 1)] int offset)
     {
-        DateTimeOffset now = new(2019, 11, 10, 15, 33, 27, 123, TimeSpan.FromHours(1d));
+        DateTimeOffset now = new(2019, 11, 10, 15, 33, 27, 123, TimeSpan.FromHours(offset));
         string value       = now.ToTrxDateTime();
 
         DateTimeOffset? actual = value.ParseDateTime();

tests/trx2junit.Core.Tests/Extensions/TimeExtensionsTests/ToTrxDateTime.cs

@@ -17,8 +17,10 @@ public string DateTime_given___correct_format(DateTimeOffset dateTime)
     //-------------------------------------------------------------------------
     private static IEnumerable<TestCaseData> DateTime_given___correct_format_TestCases()
     {
-        yield return new TestCaseData(new DateTimeOffset(2019, 11, 10, 15, 33, 27, 446, TimeSpan.FromHours(0d))).Returns("2019-11-10T15:33:27.446+00:00");
-        yield return new TestCaseData(new DateTimeOffset(2019, 11, 10, 15, 33, 27, 446, TimeSpan.FromHours(1d))).Returns("2019-11-10T15:33:27.446+01:00");
-        yield return new TestCaseData(new DateTimeOffset(2019, 11, 10, 15, 33, 27, 446, TimeSpan.FromHours(2d))).Returns("2019-11-10T15:33:27.446+02:00");
+        yield return new TestCaseData(new DateTimeOffset(2019, 11, 10, 15, 33, 27, 446, TimeSpan.FromHours(-2d))).Returns("2019-11-10T15:33:27.446-02:00");
+        yield return new TestCaseData(new DateTimeOffset(2019, 11, 10, 15, 33, 27, 446, TimeSpan.FromHours(-1d))).Returns("2019-11-10T15:33:27.446-01:00");
+        yield return new TestCaseData(new DateTimeOffset(2019, 11, 10, 15, 33, 27, 446, TimeSpan.FromHours( 0d))).Returns("2019-11-10T15:33:27.446+00:00");
+        yield return new TestCaseData(new DateTimeOffset(2019, 11, 10, 15, 33, 27, 446, TimeSpan.FromHours( 1d))).Returns("2019-11-10T15:33:27.446+01:00");
+        yield return new TestCaseData(new DateTimeOffset(2019, 11, 10, 15, 33, 27, 446, TimeSpan.FromHours( 2d))).Returns("2019-11-10T15:33:27.446+02:00");
     }
 }