@Test public void testIsBlocked() { StoptableThread thread = new TestThread2(); thread.setMaxHeartbeatInterval(2); assertThat(thread.isBlocked()).isFalse(); thread.start(); assertThat(thread.isBlocked()).isFalse(); ThreadUtils.sleep(1); assertThat(thread.isBlocked()).isFalse(); ThreadUtils.sleep(1.5); assertThat(thread.isBlocked()).isTrue(); }