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from dataclasses import dataclass

from esrally.utils import cases, crc32c


@dataclass
class ChecksumCase:
    chunks: list[bytes]
    want: int


@cases.cases(
    no_cunks=ChecksumCase(chunks=[], want=0),
    one_chunk=ChecksumCase(chunks=[b"Hello world!"], want=2073618257),
    two_chunks=ChecksumCase(chunks=[b"Hello ", b"world!"], want=2073618257),
)
def test_update(case: ChecksumCase):
    c = crc32c.Checksum()
    for chunk in case.chunks:
        c.update(chunk)
    assert c.value == case.want
