@Test
public void testCreateRangedContentSource() throws IOException {

    final B2ContentSource contentSource = new TestContentSource(100, 1000);
    final B2ContentSource firstRangedContentSource = B2LargeFileStorer.createRangedContentSource(
            contentSource, 5, 200);
    assertTrue(firstRangedContentSource instanceof TestContentSource);
    final B2ContentSource secondRangedContentSource = B2LargeFileStorer.createRangedContentSource(
            firstRangedContentSource, 10, 50);
    assertTrue(secondRangedContentSource instanceof B2PartOfContentSource);
}