Initialize CBDD solution and add a .NET-focused gitignore for generated artifacts.

tests/CBDD.Tests/InsertBulkTests.cs

@@ -0,0 +1,59 @@
+using ZB.MOM.WW.CBDD.Core;
+using ZB.MOM.WW.CBDD.Core.Collections;
+using ZB.MOM.WW.CBDD.Core.Storage;
+using ZB.MOM.WW.CBDD.Core.Transactions;
+using ZB.MOM.WW.CBDD.Shared;
+using ZB.MOM.WW.CBDD.Shared.TestDbContext_TestDbContext_Mappers;
+using Xunit;
+
+namespace ZB.MOM.WW.CBDD.Tests;
+
+public class InsertBulkTests : IDisposable
+{
+    private readonly string _testFile;
+    private readonly Shared.TestDbContext _db;
+
+    public InsertBulkTests()
+    {
+        _testFile = Path.GetTempFileName();
+        _db = new Shared.TestDbContext(_testFile);
+    }
+
+    public void Dispose()
+    {
+        _db.Dispose();
+    }
+
+    [Fact]
+    public void InsertBulk_PersistsData_ImmediatelyVisible()
+    {
+        var users = new List<User>();
+        for (int i = 0; i < 50; i++)
+        {
+            users.Add(new User { Id = ZB.MOM.WW.CBDD.Bson.ObjectId.NewObjectId(), Name = $"User {i}", Age = 20 });
+        }
+
+        _db.Users.InsertBulk(users);
+        _db.SaveChanges();
+
+        var insertedUsers = _db.Users.FindAll().ToList();
+
+        insertedUsers.Count.ShouldBe(50);
+    }
+
+    [Fact]
+    public void InsertBulk_SpanningMultiplePages_PersistsCorrectly()
+    {
+        // 16KB page. User ~50 bytes. 400 users -> ~20KB -> 2 pages.
+        var users = new List<User>();
+        for (int i = 0; i < 400; i++)
+        {
+            users.Add(new User { Id = ZB.MOM.WW.CBDD.Bson.ObjectId.NewObjectId(), Name = $"User {i} with some long padding text to ensure we fill space {new string('x', 50)}", Age = 20 });
+        }
+
+        _db.Users.InsertBulk(users);
+        _db.SaveChanges();
+
+        _db.Users.Count().ShouldBe(400);
+    }
+}