}
    }

    /**
     * Test getKeys method when subject has other credential types.
     *
     * @throws LoginException if login fails.
     */
    @Test
    void testGetKeys_WithOtherCredentialTypes() throws LoginException {
        Set<Object> privateCredentials = new HashSet<>();
        privateCredentials.add("a string credential");
        privateCredentials.add(12345L);