assertSame(clock, newClock, "withZone() should return the same clock instance");
    }

    @Test
    @DisplayName("MonotonicClock should maintain monotonic time progression")
    void testMonotonicBehavior() throws InterruptedException {
        Instant first = MonotonicClock.now();
        Thread.sleep(10); // Small delay
        Instant second = MonotonicClock.now();
        Thread.sleep(10); // Small delay