try {
certFactorySpi.engineGenerateCRLs(null);
fail("CRLException must be thrown");
} catch (CRLException e) {
}
CRL crl = certFactorySpi.engineGenerateCRL(dis);
assertNull("Result must be null", crl);
col = certFactorySpi.engineGenerateCRLs(dis);
assertNull("Result must be null", col);
List list = null;