public static void checkProxyPortProperty() throws NumberFormatException {
    checkNumericSystemProperty("http.proxyPort", Range.closed(0, 65535));
    checkNumericSystemProperty("https.proxyPort", Range.closed(0, 65535));
  }
@Test
  public void testCheckHttpProxyPortProperty_undefined() throws NumberFormatException {
    System.clearProperty("http.proxyPort");
    System.clearProperty("https.proxyPort");
    JibSystemProperties.checkProxyPortProperty();
  }