@Test
public void thatBackgroundColorRGBIsValid() {

    assertThat(mBuilder.backgroundColorRGB("#000000").build(CLOUD_URL).url().contains("b_rgb:#000000")).isTrue();
    reloadBuilder();
    assertThat(mBuilder.backgroundColorRGB(null).build(CLOUD_URL).url().contains("b_rgb")).isFalse();
}