Test for Bug 852909 - Test that the charset menu gets disabled for images and PDF.js. r=Gijs.

docshell/test/browser/browser.ini

@@ -30,6 +30,8 @@ support-files =
   file_bug503832.html
   file_bug655270.html
   file_bug670318.html
+  file_bug852909.pdf
+  file_bug852909.png
   file_bug941562-child.html
   file_bug941562.html
   print_postdata.sjs
@@ -59,6 +61,7 @@ support-files =
 [browser_bug655273.js]
 [browser_bug670318.js]
 [browser_bug673467.js]
+[browser_bug852909.js]
 [browser_bug92473.js]
 [browser_bug941562.js]
 [browser_loadDisallowInherit.js]

docshell/test/browser/browser_bug852909.js

@@ -0,0 +1,33 @@
+var rootDir = "http://mochi.test:8888/browser/docshell/test/browser/";
+
+function test() {
+  waitForExplicitFinish();
+
+  gBrowser.selectedTab = gBrowser.addTab(rootDir + "file_bug852909.png");
+  gBrowser.selectedBrowser.addEventListener("load", image, true);
+}
+
+function image(event) {
+  if (event.target != gBrowser.contentDocument) {
+    return;
+  }
+  gBrowser.selectedBrowser.removeEventListener("load", image, true);
+
+  ok(!gBrowser.docShell.mayEnableCharacterEncodingMenu, "Docshell should say the menu should be disabled for images.");
+
+  gBrowser.removeCurrentTab();
+  gBrowser.selectedTab = gBrowser.addTab(rootDir + "file_bug852909.pdf");
+  gBrowser.selectedBrowser.addEventListener("load", pdf, true);
+}
+
+function pdf(event) {
+  if (event.target != gBrowser.contentDocument) {
+    return;
+  }
+  gBrowser.selectedBrowser.removeEventListener("load", pdf, true);
+
+  ok(!gBrowser.docShell.mayEnableCharacterEncodingMenu, "Docshell should say the menu should be disabled for PDF.js.");
+
+  gBrowser.removeCurrentTab();
+  finish();
+}