Add tests for dead help links. Fix some minor bugs. Show error when trying to modify a builtin group rather than failing silently.

common/tests/functional/testHelpCommands.js

@@ -1,7 +1,11 @@
-const { module } = require("utils");
+const utils = require("utils");
+const { module } = utils;
+
 var jumlib = module("resource://mozmill/modules/jum.js");
 var dactyllib = module("dactyl");
 
+const { Services } = module("resource://gre/modules/Services.jsm");
+
 var setupModule = function (module) {
     controller = mozmill.getBrowserController();
     dactyl = new dactyllib.Controller(controller);
@@ -15,8 +19,15 @@ var setupTest = function (test) {
     dactyl.runViCommand([["VK_ESCAPE"]]);
 };
 
+function urlTarget(url) Services.io.newChannel(url, null, null).name;
+
+__defineGetter__("doesNotExist", function () {
+    delete this.doesNotExist;
+    return this.doesNotExist = urlTarget("dactyl://help-tag/non-existent-help-tag-url-thingy");
+});
+
 const HELP_FILES = ["all", "tutorial", "intro", "starting", "browsing",
-    "buffer", "cmdline", "insert", "options", "pattern", "tabs", "hints",
+    "buffer", "cmdline", "editing", "options", "pattern", "tabs", "hints",
     "map", "eval", "marks", "repeat", "autocommands", "print", "gui",
     "styling", "message", "privacy", "developer", "various", "plugins", "faq",
     "versions", "index"];
@@ -56,6 +67,14 @@ var testExHelpCommand_PageTagArg_OpensHelpPageContainingTag = function () {
             HELP_COMMAND: function () { dactyl.runExCommand("help " + tag); },
             EXPECTED_HELP_TAG: tag
         });
+
+        let links = controller.tabs.activeTab.querySelectorAll("a[href^='dactyl:']");
+
+        let missing = Array.filter(links, function (link) urlTarget(link.href) === doesNotExist)
+                           .map(function (link) link.textContent + " -> " + link.href);
+
+        utils.assertEqual("testHelpCommands.assertNoDeadLinks", 0, missing.length,
+                          "Found dead links in " + tag + ": " + missing.join(", "));
     }
 };