From 1b11dba97b27142699f0ff38a55a80e0d06d8a62 Mon Sep 17 00:00:00 2001
From: "Dailey, Alaric" <alaricd@pengdows.com>
Date: Tue, 20 Oct 2026 07:41:03 -0500
Subject: [PATCH] Test closing a never-opened connection

---
 DuckDB.NET.Test/DuckDBConnectionTests.cs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/DuckDB.NET.Test/DuckDBConnectionTests.cs b/DuckDB.NET.Test/DuckDBConnectionTests.cs
index a446d35a..1d62248d 100644
--- a/DuckDB.NET.Test/DuckDBConnectionTests.cs
+++ b/DuckDB.NET.Test/DuckDBConnectionTests.cs
@@ -73,6 +73,21 @@ public async Task CloseCanBeCalledMoreThanOnce()
         stateChanges.Should().Be(1, "only the first Close changes the state");
     }
 
+    [Fact]
+    [Trait("Category", "Baseline")]
+    public async Task CloseNeverOpenedConnectionDoesNotThrow()
+    {
+        await using var duckDBConnection = new DuckDBConnection("DataSource=:memory:");
+        var stateChanges = 0;
+        duckDBConnection.StateChange += (_, _) => stateChanges++;
+
+        duckDBConnection.Close();
+        await duckDBConnection.CloseAsync();
+
+        duckDBConnection.State.Should().Be(ConnectionState.Closed);
+        stateChanges.Should().Be(0, "a connection that was never opened does not change state");
+    }
+
     [Fact]
     [Trait("Category", "Baseline")]
     public async Task CloseAfterDisposeDoesNotThrow()
@@ -552,4 +567,4 @@ public void ConnectionSetsDuckDBApiConfigOption()
             value.Should().StartWith("DuckDB.NET");
         }
     }
-}
\ No newline at end of file
+}