@Test
 public void testInvalidSample2() {
   Feature.Sample s = new Feature.Sample(100, new Number[] {0}, new Field[] {});
   Assert.assertTrue(FeatureMicLevel.getMicLevel(s, 1) < 0);
 }
 @Test
 public void testGetSample2() {
   byte level = 123;
   Feature.Sample s = new Feature.Sample(100, new Number[] {0, level}, new Field[] {});
   Assert.assertEquals(level, FeatureMicLevel.getMicLevel(s, 1));
 }
 @Test
 public void testNullInvalidSample() {
   Assert.assertTrue(FeatureMicLevel.getMicLevel(null, 0) < 0);
   Assert.assertTrue(FeatureMicLevel.getMicLevel(null, 10) < 0);
 }