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

tests/CBDD.Tests/VisibilityTests.cs

@@ -0,0 +1,47 @@
+using ZB.MOM.WW.CBDD.Bson;
+using ZB.MOM.WW.CBDD.Core.Collections;
+using Xunit;
+using System.Linq;
+
+namespace ZB.MOM.WW.CBDD.Tests;
+
+public class VisibilityTests
+{
+    public class VisibilityEntity
+    {
+        // Should be included
+        public int NormalProp { get; set; }
+
+        // Should be included (serialization usually writes it)
+        public int PrivateSetProp { get; private set; }
+
+        // Should be included
+        public int InitProp { get; init; }
+
+        // Fields - typically included in BSON if public, but reflection need GetFields
+        public string PublicField = string.Empty;
+
+        // Should NOT be included
+        private int _privateField;
+
+        // Helper to set private
+        public void SetPrivate(int val) => _privateField = val;
+    }
+
+    [Fact]
+    public void GenerateSchema_VisibilityChecks()
+    {
+        var schema = BsonSchemaGenerator.FromType<VisibilityEntity>();
+
+        schema.Fields.ShouldContain(f => f.Name == "normalprop");
+        schema.Fields.ShouldContain(f => f.Name == "privatesetprop");
+        schema.Fields.ShouldContain(f => f.Name == "initprop");
+
+        // Verify assumption about fields
+        // Current implementation uses GetProperties, so publicfield might be missing.
+        // We will assert current status and then fix if requested/failed.
+        schema.Fields.ShouldContain(f => f.Name == "publicfield"); // This will likely fail currently
+
+        schema.Fields.ShouldNotContain(f => f.Name == "_privatefield");
+    }
+}