diff --git a/.gitignore b/.gitignore
index b5450468..7a8c84ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@ EssentialCSharpManuscript.[0-9]
.vs/
obj
bin
+TestResults/
~$*.do[ct]x
~*.tmp
~$*.dotm
diff --git a/Directory.Packages.props b/Directory.Packages.props
index 0012ca46..f9fcf955 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -12,6 +12,9 @@
https://pkgs.dev.azure.com/intelliTect/_packaging/EssentialCSharp/nuget/v3/index.json;
+
+ 1.72.0
+
@@ -36,8 +39,8 @@
-
-
+
+
diff --git a/EssentialCSharp.Chat.Tests/PgVectorConnectorTests.cs b/EssentialCSharp.Chat.Tests/PgVectorConnectorTests.cs
new file mode 100644
index 00000000..ed5c9fe9
--- /dev/null
+++ b/EssentialCSharp.Chat.Tests/PgVectorConnectorTests.cs
@@ -0,0 +1,28 @@
+using EssentialCSharp.Chat.Common.Models;
+using Microsoft.SemanticKernel.Connectors.PgVector;
+
+namespace EssentialCSharp.Chat.Tests;
+
+public class PgVectorConnectorTests
+{
+ ///
+ /// Verifies that PostgresVectorStore.GetCollection does not throw a TypeLoadException,
+ /// which would indicate a version mismatch between Microsoft.SemanticKernel core and
+ /// Microsoft.SemanticKernel.Connectors.PgVector (e.g., missing vtable slots on
+ /// internal types like PostgresModelBuilder).
+ ///
+ [Test]
+ public async Task GetCollection_WithBookContentChunk_DoesNotThrowTypeLoadException()
+ {
+ // Arrange — no real DB connection is needed; connections are only opened for actual queries
+#pragma warning disable SKEXP0010 // PostgresVectorStore is experimental
+ using var store = new PostgresVectorStore("Host=localhost;Database=test;Username=test;Password=test");
+
+ // Act — this triggers loading internal PostgresModelBuilder via PostgresCollection ctor
+ var collection = store.GetCollection("test-collection");
+#pragma warning restore SKEXP0010
+
+ // Assert
+ await Assert.That(collection).IsNotNull();
+ }
+}