fix: update error message in tests

Author: matteo-gobbo

test/integration/test/client/client.test.ts

@@ -645,7 +645,7 @@ test('should respect client notification capabilities', async () => {
     await clientWithoutCapability.connect(clientTransport);
 
     // This should throw because the client doesn't have the roots.listChanged capability
-    await expect(clientWithoutCapability.sendRootsListChanged()).rejects.toThrow(/^Client does not support/);
+    await expect(clientWithoutCapability.sendRootsListChanged()).rejects.toThrow(/^MCP error -32043: Client does not support/);
 });
 
 /***