Bug 1568972 - Adds test for displaying error section. r=johannh

Differential Revision: https://phabricator.services.mozilla.com/D39530

--HG--
extra : moz-landing-system : lando

toolkit/components/certviewer/content/certviewer.js

@@ -13,7 +13,7 @@ document.addEventListener("DOMContentLoaded", async e => {
   let url = new URL(document.URL);
   let certInfo = url.searchParams.getAll("cert");
   if (certInfo.length === 0) {
-    await render(true);
+    await render(false, true);
     return;
   }
   certInfo = certInfo.map(cert => decodeURIComponent(cert));

toolkit/components/certviewer/tests/browser/browser.ini

@@ -1,6 +1,7 @@
 [DEFAULT]
 support-files =
   adjustedCerts.js
+[browser_aboutcertificateviewer.js]
 [browser_handleMultipleCertsURL.js]
 [browser_openTabAndSendCertInfo.js]
 [browser_renderCertToUI.js]