@Test
  public void getMaximumNumberOfTradingDaysRequired() {
    final int daysGradient = 7;

    final SimpleMovingAverageGradientSignals smaGradient =
        new SimpleMovingAverageGradientSignals(
            lookback, daysGradient, GradientType.NEGATIVE, MATH_CONTEXT);

    assertEquals(lookback + daysGradient, smaGradient.getRequiredNumberOfTradingDays());
  }