assertTrue(connection instanceof NtlmHttpURLConnection, "Connection should be an instance of NtlmHttpURLConnection.");
    }

    @Test
    void testOpenConnection_UnknownProtocol_ThrowsIOException() {
        // This test verifies that attempting to open a connection for an unsupported protocol
        // results in an IOException, as no default handler should be found.

Shinsuke Sugaya <******@****.***> 1755149504 +0900