Refactor code structure and optimize performance across multiple modules

src/__Libraries/__Tests/StellaOps.Microservice.Tests/HeaderCollectionTests.cs

@@ -7,7 +7,8 @@ public sealed class HeaderCollectionTests
 {
     #region Constructor Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Constructor_Default_CreatesEmptyCollection()
     {
         // Arrange & Act
@@ -17,7 +18,8 @@ public sealed class HeaderCollectionTests
         headers.Should().BeEmpty();
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Constructor_WithKeyValuePairs_AddsAllHeaders()
     {
         // Arrange
@@ -35,7 +37,8 @@ public sealed class HeaderCollectionTests
         headers["Accept"].Should().Be("application/json");
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Constructor_WithDuplicateKeys_AddsMultipleValues()
     {
         // Arrange
@@ -56,7 +59,8 @@ public sealed class HeaderCollectionTests
 
     #region Empty Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Empty_IsSharedInstance()
     {
         // Arrange & Act
@@ -67,7 +71,8 @@ public sealed class HeaderCollectionTests
         empty1.Should().BeSameAs(empty2);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Empty_HasNoHeaders()
     {
         // Arrange & Act
@@ -81,7 +86,8 @@ public sealed class HeaderCollectionTests
 
     #region Indexer Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Indexer_ExistingKey_ReturnsFirstValue()
     {
         // Arrange
@@ -95,7 +101,8 @@ public sealed class HeaderCollectionTests
         value.Should().Be("application/json");
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Indexer_MultipleValues_ReturnsFirstValue()
     {
         // Arrange
@@ -110,7 +117,8 @@ public sealed class HeaderCollectionTests
         value.Should().Be("application/json");
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Indexer_NonexistentKey_ReturnsNull()
     {
         // Arrange
@@ -123,7 +131,8 @@ public sealed class HeaderCollectionTests
         value.Should().BeNull();
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Indexer_IsCaseInsensitive()
     {
         // Arrange
@@ -140,7 +149,8 @@ public sealed class HeaderCollectionTests
 
     #region Add Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Add_NewKey_AddsHeader()
     {
         // Arrange
@@ -153,7 +163,8 @@ public sealed class HeaderCollectionTests
         headers["Content-Type"].Should().Be("application/json");
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Add_ExistingKey_AppendsValue()
     {
         // Arrange
@@ -167,7 +178,8 @@ public sealed class HeaderCollectionTests
         headers.GetValues("Accept").Should().HaveCount(2);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Add_CaseInsensitiveKey_AppendsToExisting()
     {
         // Arrange
@@ -185,7 +197,8 @@ public sealed class HeaderCollectionTests
 
     #region Set Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Set_NewKey_AddsHeader()
     {
         // Arrange
@@ -198,7 +211,8 @@ public sealed class HeaderCollectionTests
         headers["Content-Type"].Should().Be("application/json");
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Set_ExistingKey_ReplacesValue()
     {
         // Arrange
@@ -217,7 +231,8 @@ public sealed class HeaderCollectionTests
 
     #region GetValues Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void GetValues_ExistingKey_ReturnsAllValues()
     {
         // Arrange
@@ -233,7 +248,8 @@ public sealed class HeaderCollectionTests
         values.Should().BeEquivalentTo(["application/json", "text/plain", "text/html"]);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void GetValues_NonexistentKey_ReturnsEmptyEnumerable()
     {
         // Arrange
@@ -246,7 +262,8 @@ public sealed class HeaderCollectionTests
         values.Should().BeEmpty();
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void GetValues_IsCaseInsensitive()
     {
         // Arrange
@@ -262,7 +279,8 @@ public sealed class HeaderCollectionTests
 
     #region TryGetValue Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void TryGetValue_ExistingKey_ReturnsTrueAndValue()
     {
         // Arrange
@@ -277,7 +295,8 @@ public sealed class HeaderCollectionTests
         value.Should().Be("application/json");
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void TryGetValue_NonexistentKey_ReturnsFalse()
     {
         // Arrange
@@ -291,7 +310,8 @@ public sealed class HeaderCollectionTests
         value.Should().BeNull();
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void TryGetValue_IsCaseInsensitive()
     {
         // Arrange
@@ -310,7 +330,8 @@ public sealed class HeaderCollectionTests
 
     #region ContainsKey Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ContainsKey_ExistingKey_ReturnsTrue()
     {
         // Arrange
@@ -321,7 +342,8 @@ public sealed class HeaderCollectionTests
         headers.ContainsKey("Content-Type").Should().BeTrue();
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ContainsKey_NonexistentKey_ReturnsFalse()
     {
         // Arrange
@@ -331,7 +353,8 @@ public sealed class HeaderCollectionTests
         headers.ContainsKey("X-Missing").Should().BeFalse();
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ContainsKey_IsCaseInsensitive()
     {
         // Arrange
@@ -347,7 +370,8 @@ public sealed class HeaderCollectionTests
 
     #region Enumeration Tests
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void GetEnumerator_EnumeratesAllHeaderValues()
     {
         // Arrange
@@ -366,7 +390,8 @@ public sealed class HeaderCollectionTests
         list.Should().Contain(kvp => kvp.Key == "Accept" && kvp.Value == "text/html");
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void GetEnumerator_EmptyCollection_EnumeratesNothing()
     {
         // Arrange