Noissue - Fixed "$xmlhttprequest Exception" test case

pages/exceptions/xmlhttprequest.tmpl

 title = $xmlhttprequest Exception
 template = testcase
 
 {% set testcase_moreinfo = [
   ("Filter Options", "https://adblockplus.org/filters#options"),
 ] %}
 
 <script>
 function aborted(evt) {
   pagelog("XMLHTTPRequest was aborted.");
 }
 
 function failed(evt) {
   pagelog("XMLHTTPRequest failed.");
 }
 
 function makerequest() {
   var req = new XMLHttpRequest();
   req.addEventListener("error", failed);
   req.addEventListener("abort", aborted);
-  req.open("GET", "http://testpages.adblockplus.org/testcasefiles/xmlhttprequestexception/text.txt", true);
+  req.open("GET", "https://testpages.adblockplus.org/testcasefiles/xmlhttprequestexception/text.txt", true);
   req.onload = function(e) {
     if (this.status == 200) {
       pagelog(this.responseText);
        }
     };
   req.send();
 }
 
 document.addEventListener('DOMContentLoaded', makerequest, false);
 </script>
 
 <section class="site-panel">
   <h2>$xmlhttprequest Exception</h2>
   <p>Check that usage of the $xmlhttprequest filter option in an exception filter works as expected.</p>
   <p>With the filter(s) displayed below each test case added to ABP (or with the testcase subscription installed and active), the XMLHTTPRequest should not be blocked while the image should be.</p>
 </section>
 
 <section class="site-panel">
   <h2>Test case</h2>
   <p>The XMLHTTPRequest should not be blocked. The Image should be blocked.</p>
   <div class="testcase-container">
     <div class="testcase-row">
-      <h3>XMLHTTPRequest</h3><div id="testcase-output"></div>
+      <h3>XMLHTTPRequest</h3>
+      <div id="testcase-output"></div>
+      <div id="testcase-output-expected">
+        Text loaded via XMLHTTPRequest
+      </div>
     </div>
     <div class="testcase-row">
-      <h3>Image</h3><img class="testcase-image" src="/testcasefiles/xmlhttprequestexception/image.jpg"/>
+      <h3>Image</h3><img class="blocked" src="/testcasefiles/xmlhttprequestexception/image.jpg"/>
     </div>
   </div>
   <h3>Filters</h3>
   <pre>||testpages.adblockplus.org/testcasefiles/xmlhttprequestexception/*</pre>

[Sebastian Noack, 2018/09/01 19:30:48]

There were several issues with this test case:

1. It never gave the expected output to begin with, since the (whitelisted)
   XHR never went through due to mixed content (requesting unencrypted HTTP
   from a page delivered over HTTPS).
2. The image that is supposed to be blocked, wasn't indicated accordingly
   for the automation.
3. The expected result of successfully performing the XHR wasn't indicated
   in a machine-readable way for the automation (i.e. there was no element with
the ID "testcase-output-expected").

   <pre>@@testpages.adblockplus.org/testcasefiles/xmlhttprequestexception/$xmlhttprequest</pre>
-</section>
+</section>