return lastFunction;
        }
    }

    // Inner class for test credential
    private static class TestLoginCredential implements LoginCredential {
        private final String username;
        private final String password;

        public TestLoginCredential(String username, String password) {
            this.username = username;
            this.password = password;
        }

        assertNotNull(credential);
        assertEquals("entraiduser", ((TestLoginCredential) credential).username);
    }

    // Helper classes for testing
    private static class TestLoginCredential implements LoginCredential {
        private final String username;

        public TestLoginCredential(String username) {
            this.username = username;
        }

        @Override