@Test
public void testStartByte() throws IOException {

    final B2LargeFileStorer largeFileStorer = createLargeFileStorerForStartByteTests();
    assertEquals(0, largeFileStorer.getStartByteOrUnknown(1));
    assertEquals(100, largeFileStorer.getStartByteOrUnknown(2));
    assertEquals(100 + PART_SIZE_FOR_FIRST_TWO, largeFileStorer.getStartByteOrUnknown(3));
    assertEquals(B2UploadProgress.UNKNOWN_PART_START_BYTE, largeFileStorer.getStartByteOrUnknown(4));
}