@Test
    void defaultMultipartRemovalStrategy() throws Throwable {
        assertThat(Flags.defaultMultipartRemovalStrategy())
                .isEqualTo(MultipartRemovalStrategy.ON_RESPONSE_COMPLETION);
    }
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