tracker1.addChunk(1, chunk1, Optional.<Integer>absent());
tracker1.addChunk(2, chunk2, Optional.<Integer>absent());
tracker1.addChunk(3, chunk3, Optional.<Integer>absent());
// Verify that an InvalidChunkException is thrown when we try to add a chunk to a sealed tracker
tracker1.addChunk(1, chunk1, Optional.<Integer>absent());
tracker1.addChunk(2, chunk2, Optional.<Integer>absent());
tracker1.addChunk(3, chunk3, Optional.<Integer>absent());
// Verify that an InvalidChunkException is thrown when we try to add a chunk to a sealed tracker