@Test
    void openSslAvailable() {
        assumeThat(osName.startsWith("linux") || osName.startsWith("windows") ||
                   osName.startsWith("mac") || osName.startsWith("osx")).isTrue();
        assumeThat(System.getProperty("com.linecorp.armeria.tlsEngineType")).isNull();

        assertThat(Flags.tlsEngineType()).isEqualTo(TlsEngineType.OPENSSL);
        assertThat(OpenSsl.isAvailable()).isTrue();
    }
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