code: @Override
    public void setSystemProperty(String propertyName, String value) {
      if (Strings.isNullOrEmpty(propertyName)) {
        throw new IllegalArgumentException("Property name can't be empty.");
      }
  
      execute(
          "-selendroid-setAndroidOsSystemProperty",
          ImmutableMap.of(
              "propertyName", propertyName,
              "value", value));
    }
docs: Sets a Java System Property.