@Test
    void acquireAndReleaseWithNullEndpoint() {
        final DefaultEventLoopScheduler s = defaultEventLoopScheduler();
        final AbstractEventLoopEntry e0 = acquireEntry(s, null);
        final EventLoop loop = e0.get();
        assertThat(e0.id()).isZero();
        assertThat(e0.activeRequests()).isEqualTo(1);
        e0.release();
        assertThat(e0.activeRequests()).isZero();

        for (int i = 0; i < 2; i++) {
            final AbstractEventLoopEntry e0again = acquireEntry(s, null);
            assertThat(e0again).isSameAs(e0);
            assertThat(e0again.id()).isZero();
            assertThat(e0again.activeRequests()).isEqualTo(1);
            assertThat(e0again.get()).isSameAs(loop);
            e0again.release();
        }
    }
Similar to {@link #acquireAndRelease()}, but with a {@code null} {@link Endpoint}.
core/src/test/java/com/linecorp/armeria/client/DefaultEventLoopSchedulerTest.java