@Test
    void testChannelOptions() throws Exception {
        final ServerBootstrap bootstrap = server.server().serverBootstrap;
        assertThat(bootstrap).isNotNull();
        assertThat(bootstrap.config().options().get(ChannelOption.SO_BACKLOG)).isEqualTo(1024);
    }
Ensures that the {@link Server} is always started when a test begins. This is necessary even if we
enabled auto-start for {@link ServerRule} because we stop it in {@link #testStartStop()}.
core/src/test/java/com/linecorp/armeria/server/ServerTest.java