try {
certFactorySpi.engineGenerateCertificates(null);
fail("CertificateException must be thrown");
} catch (CertificateException e) {
}
Certificate cert = certFactorySpi
.engineGenerateCertificate(dis);
assertNull("Result must be null", cert);
Collection col = certFactorySpi
.engineGenerateCertificates(dis);
assertNull("Result must be null", col);