test_strings=[b"Short string.",b"",b"Although ChaCha20 is a stream cipher, it operates on blocks of 64 bytes. This string is over 152 bytes in length so that we test multi-block encryption.",b"This string is exactly 64 bytes long, that is exactly one block."]
test_strings=[
b"Short string.",
b"",
b"Although ChaCha20 is a stream cipher, it operates on blocks of 64 bytes. This string is over 152 bytes in length so that we test multi-block encryption.",
b"This string is exactly 64 bytes long, that is exactly one block.",