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

tests/CBDD.Tests/DocumentCollectionDeleteTests.cs

@@ -0,0 +1,80 @@
+using ZB.MOM.WW.CBDD.Bson;
+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 DocumentCollectionDeleteTests : IDisposable
+{
+    private readonly string _dbPath;
+    private readonly string _walPath;
+    private readonly Shared.TestDbContext _dbContext;
+
+    public DocumentCollectionDeleteTests()
+    {
+        _dbPath = Path.Combine(Path.GetTempPath(), $"test_delete_{Guid.NewGuid()}.db");
+        _walPath = Path.Combine(Path.GetTempPath(), $"test_delete_{Guid.NewGuid()}.wal");
+
+        _dbContext = new Shared.TestDbContext(_dbPath);
+    }
+
+    public void Dispose()
+    {
+        _dbContext.Dispose();
+    }
+
+    [Fact]
+    public void Delete_RemovesDocumentAndIndexEntry()
+    {
+        var user = new User { Id = ObjectId.NewObjectId(), Name = "To Delete", Age = 10 };
+        _dbContext.Users.Insert(user);
+        _dbContext.SaveChanges();
+
+        // Verify inserted
+        _dbContext.Users.FindById(user.Id).ShouldNotBeNull();
+
+        // Delete
+        var deleted = _dbContext.Users.Delete(user.Id);
+        _dbContext.SaveChanges();
+
+        // Assert
+        deleted.ShouldBeTrue("Delete returned false");
+
+        // Verify deleted from storage
+        _dbContext.Users.FindById(user.Id).ShouldBeNull();
+
+        // Verify Index is clean (FindAll uses index scan)
+        var all = _dbContext.Users.FindAll();
+        all.ShouldBeEmpty();
+    }
+
+    [Fact]
+    public void Delete_NonExistent_ReturnsFalse()
+    {
+        var id = ObjectId.NewObjectId();
+        var deleted = _dbContext.Users.Delete(id);
+        _dbContext.SaveChanges();
+        deleted.ShouldBeFalse();
+    }
+
+    [Fact]
+    public void Delete_WithTransaction_CommitsSuccessfully()
+    {
+        var user = new User { Id = ObjectId.NewObjectId(), Name = "Txn Delete", Age = 20 };
+        _dbContext.Users.Insert(user);
+        _dbContext.SaveChanges();
+
+        using (var txn = _dbContext.BeginTransaction())
+        {
+            _dbContext.Users.Delete(user.Id);
+            _dbContext.SaveChanges();
+        }
+
+        // Verify
+        _dbContext.Users.FindById(user.Id).ShouldBeNull();
+    }
+}