@Test
    @SetSystemProperty(key = "com.linecorp.armeria.transientServiceOptions", value = "with_tracing")
    void systemPropertyTransientServiceOptions() throws Throwable {
        assertFlags("transientServiceOptions")
                .usingRecursiveComparison()
                .isEqualTo(Sets.immutableEnumSet(TransientServiceOption.WITH_TRACING));
    }
Makes sure OpenSSL SSLEngine is used instead of JDK SSLEngine while running tests
on Linux, Windows and OS X.
core/src/test/java/com/linecorp/armeria/common/FlagsTest.java