@Test
public void getInstanceFields() {

    Field[] result = cache.getInstanceFields(String.class);
    Field[] fields = ReflectionUtil.getAllInstanceFields(String.class);
    assertArrayEquals(result, fields);
    instanceFieldSize = result.length;
    result = cache.getInstanceFields(AnnotationClass.class);
    fields = ReflectionUtil.getAllInstanceFields(AnnotationClass.class);
    assertArrayEquals(result, fields);
    getFields();
    assertTrue(fieldSize > 0);
    assertTrue(instanceFieldSize > 0);
    assertTrue(fieldSize > instanceFieldSize);
}