public void setAreaRate(float areaRate) {
        this.areaRate = areaRate;
    }
@Test
    public void setAreaRate() {
        SAExposureConfig saExposureConfig = new SAExposureConfig(1,1,true);
        saExposureConfig.setAreaRate(2);
        assertEquals(2, saExposureConfig.getAreaRate(), 0.5);
    }