Made Add function, Added Tests. Added comments to int Tests

FlexArray.Test/FlexArrayIntTests.cs

@@ -2,6 +2,7 @@
 
 public class FlexArrayIntTests
 {
+    // Constructor tests
     [Fact]
     public void Construction_NoSize()
     {
@@ -36,6 +37,7 @@ public class FlexArrayIntTests
         array.Capacity.Should().Be(0, "negative size provided => set to 0");
     }
     
+    // Add tests
     [Fact]
     public void AddItem_Single()
     {
@@ -81,6 +83,7 @@ public class FlexArrayIntTests
         array.Count.Should().Be(FlexArrayInt.DefaultStartSize + 2);
     }
     
+    // Contains tests
     [Fact]
     public void Contains_Success()
     {
@@ -127,6 +130,7 @@ public class FlexArrayIntTests
              .Should().BeFalse("not contained in list");
     }
     
+    // Indexer tests
     [Fact]
     public void Indexer_Simple()
     {
@@ -160,7 +164,7 @@ public class FlexArrayIntTests
 
         array[index].Should().Be(-1, reason);
     }
-
+    
     [Fact]
     public void Iterate()
     {
@@ -176,6 +180,7 @@ public class FlexArrayIntTests
         }
     }
     
+    // Remove tests
     [Fact]
     public void Remove_ByIndex_Simple()
     {