@Test
    void defaultTlsEngineType() {
        assumeThat(System.getProperty("com.linecorp.armeria.tlsEngineType")).isNull();

        assertThat(Flags.tlsEngineType()).isEqualTo(TlsEngineType.OPENSSL);
    }
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