auth.handle(new Callback[] { nc });
        assertEquals("user@DOM", nc.getName());
    }

    @Test
    @DisplayName("handle: sets only provided callbacks (password-only)")
    void testHandlePasswordOnly() throws Exception {
        JAASAuthenticator auth = new JAASAuthenticator("DOM", "user", "secret");
        PasswordCallback pc = new PasswordCallback("pass:", false);
        auth.handle(new Callback[] { pc });