This cert has an invalid serial number which is negative.

The certificate data can be updated/regenerated with the
net/data/parse_certificate_unittest/regenerate_pem_from_ascii.py script.

#-----BEGIN SERIAL-----
    INTEGER { `8001` }
#-----END SERIAL-----

-----BEGIN CERTIFICATE-----
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
-----END CERTIFICATE-----

WARNING: Serial number is negative

-----BEGIN ERRORS-----
V0FSTklORzogU2VyaWFsIG51bWJlciBpcyBuZWdhdGl2ZQo=
-----END ERRORS-----