@Test
    void epollAvailableOnLinux() {
        assumeThat(osName).startsWith("linux");
        assumeThat(System.getProperty("com.linecorp.armeria.useEpoll")).isNull();
        assumeThat(System.getProperty("com.linecorp.armeria.transportType")).isNull();

        assertThat(Flags.transportType()).isEqualTo(TransportType.EPOLL);
        assertThat(Epoll.isAvailable()).isTrue();
    }
Makes sure /dev/epoll is used while running tests on Linux.
core/src/test/java/com/linecorp/armeria/common/FlagsTest.java