diff --git a/lib/cert-info.js b/lib/cert-info.js
index 8672112..b3e8cc7 100644
--- a/lib/cert-info.js
+++ b/lib/cert-info.js
@@ -62,20 +62,20 @@ certInfo.getCertInfoFromFile = function (pemFile) {
   return require('fs').readFileSync(pemFile, 'ascii');
 };
 
-certInfo.testGetCertInfo = function () {
+certInfo.testGetCertInfo = function (pathname) {
   var path = require('path');
-  var pemFile = path.join(__dirname, '..', 'tests', 'example.cert.pem');
+  var pemFile = pathname || path.join(__dirname, '..', 'tests', 'example.cert.pem');
   return certInfo.getCertInfo(certInfo.getCertInfoFromFile(pemFile));
 };
 
-certInfo.testBasicCertInfo = function () {
+certInfo.testBasicCertInfo = function (pathname) {
   var path = require('path');
-  var pemFile = path.join(__dirname, '..', 'tests', 'example.cert.pem');
+  var pemFile = pathname || path.join(__dirname, '..', 'tests', 'example.cert.pem');
   return certInfo.getBasicInfo(certInfo.getCertInfoFromFile(pemFile));
 };
 
 if (require.main === module) {
-  var c = certInfo.testGetCertInfo();
+  var c = certInfo.testGetCertInfo(process.argv[2]);
 
   console.info('');
 
@@ -88,4 +88,9 @@ if (require.main === module) {
   console.info(new Date(c.notAfter.value).valueOf());
 
   console.info('');
+
+  var b = certInfo.testBasicCertInfo(process.argv[2]);
+  console.info('');
+  console.info(JSON.stringify(b, null, '  '));
+  console.info('');
 }