code: @Test public void testAcceptProvidedExtensionAsServer() throws Exception {
    DefaultExtension defaultExtension=new DefaultExtension();
    assertTrue(defaultExtension.acceptProvidedExtensionAsServer("Test"));
    assertTrue(defaultExtension.acceptProvidedExtensionAsServer(""));
    assertTrue(defaultExtension.acceptProvidedExtensionAsServer("Test, ASDC, as, ad"));
    assertTrue(defaultExtension.acceptProvidedExtensionAsServer("ASDC, as,ad"));
    assertTrue(defaultExtension.acceptProvidedExtensionAsServer("permessage-deflate"));
  }
  