Added a test to check the chunk() method behavior when called without providing chunk_number
Added a test to check the chunk() method behavior when called without providing chunk_number

NerdWalletOSS/Q,NerdWalletOSS/Q,NerdWalletOSS/Q,NerdWalletOSS/Q,NerdWalletOSS/Q,NerdWalletOSS/Q,NerdWalletOSS/Q,NerdWalletOSS/Q