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#!/usr/bin/env python3
import subprocess
import zlib
import os
import itertools
import unittest
INTERESTING = bytes([0x00, 0x42, 0xff, 0x01, 0x80])
class RefdataTest(unittest.TestCase):
def run_test(self, test_data):
ref_val = zlib.crc32(test_data)
binary = os.environ.get('CRC32_TEST_BINARY', 'build/crc32_test')
output = subprocess.check_output(binary, input=test_data)
test_val = int(output, 16) & 0xffffffff
self.assertEqual(test_val, ref_val, f'mismatched results checking input {test_data}')
def test_empty(self):
self.run_test(b'')
def test_one_byte(self):
for x in range(256):
self.run_test(bytes([x]))
def test_two_byte(self):
for x, y in itertools.product(INTERESTING, repeat=2):
self.run_test(bytes([x, y]))
def test_three_bytes(self):
for x, y, z in itertools.product(INTERESTING, repeat=3):
self.run_test(bytes([x, y, z]))
def test_four_bytes(self):
for w, x, y, z in itertools.product(INTERESTING, repeat=4):
self.run_test(bytes([w, x, y, z]))
def test_random_strings(self):
for length in range(3, 24):
for i in range(20):
self.run_test(os.urandom(length))
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