@Test
public void testGetSpectralInputString() throws Exception {

    System.setProperty(LandsatGeotiffReader.SYSPROP_READ_AS, "reflectance");
    assertEquals("REFLECTANCE", Landsat8Metadata.getSpectralInputString());
    System.setProperty(LandsatGeotiffReader.SYSPROP_READ_AS, "radiance");
    assertEquals("RADIANCE", Landsat8Metadata.getSpectralInputString());
}