assertThrows(SmbAuthException.class, () -> ctx.initSecContext(new byte[] {}, 0, 0));
    }

    @Test
    @DisplayName("searchSessionKey returns null when Subject has no tickets")
    void searchSessionKey_emptySubject() throws Exception {
        // Arrange GSS context so method can run without NPE
        GSSName src = mock(GSSName.class);
        GSSName targ = mock(GSSName.class);