Implementing litedb-org#2698

Author: surgicalcoder

LiteDBX.Tests/Document/ObjectId_Tests.cs

@@ -1,4 +1,5 @@
-using FluentAssertions;
+using System;
+using FluentAssertions;
 using Xunit;
 
 namespace LiteDbX.Tests.Document;
@@ -41,4 +42,44 @@ public void ObjectId_Equals_Null_Does_Not_Throw()
         oid1.Equals(null).Should().BeFalse();
         oid1.Equals(oid0).Should().BeFalse();
     }
+    
+    
+    [Fact]
+    public void ObjectId_ToString_Minimizes_Allocations()
+    {
+        var objectId = ObjectId.NewObjectId();
+
+        objectId.ToString();
+
+        GC.Collect();
+        GC.WaitForPendingFinalizers();
+        GC.Collect();
+
+        var before = GC.GetAllocatedBytesForCurrentThread();
+        var hex = objectId.ToString();
+        var allocated = GC.GetAllocatedBytesForCurrentThread() - before;
+
+        hex.Should().HaveLength(24);
+        allocated.Should().BeLessThan(220);
+    }
+
+    [Fact]
+    public void ObjectId_FromHex_Minimizes_Allocations()
+    {
+        var original = ObjectId.NewObjectId();
+        var hex = original.ToString();
+
+        _ = new ObjectId(hex);
+
+        GC.Collect();
+        GC.WaitForPendingFinalizers();
+        GC.Collect();
+
+        var before = GC.GetAllocatedBytesForCurrentThread();
+        var parsed = new ObjectId(hex);
+        var allocated = GC.GetAllocatedBytesForCurrentThread() - before;
+
+        parsed.Should().Be(original);
+        allocated.Should().BeLessThan(220);
+    }
 }