Bug 1346671 - Enable the no-useless-concat eslint rule in toolkit/ r=jaws

MozReview-Commit-ID: 1a422BiLEhK

--HG--
extra : rebase_source : a83b8d753e2a48593904ef0755d5517908588b93

browser/base/content/test/plugins/browser_blocklist_content.js

@@ -72,7 +72,7 @@ add_task(function* () {
   // Hack the planet! Load our blocklist shim, so we can mess with blocklist
   // return results in the content process. Active until we close our tab.
   let mm = gTestBrowser.messageManager;
-  info("test 3a: loading " + gChromeRoot + "blocklist_proxy.js" + "\n");
+  info("test 3a: loading " + gChromeRoot + "blocklist_proxy.js\n");
   mm.loadFrameScript(gChromeRoot + "blocklist_proxy.js", true);
 
   yield promiseTabLoadEvent(gBrowser.selectedTab, gTestRoot + "plugin_test.html");

browser/components/customizableui/test/browser_1087303_button_preferences.js

@@ -42,7 +42,7 @@ function waitForPageLoad(aTab) {
   function onTabLoad(event) {
     clearTimeout(timeoutId);
     aTab.linkedBrowser.removeEventListener("load", onTabLoad, true);
-    info("Tab event received: " + "load");
+    info("Tab event received: load");
     deferred.resolve();
  }
   aTab.linkedBrowser.addEventListener("load", onTabLoad, true, true);

browser/components/migration/ESEDBReader.jsm

@@ -432,7 +432,7 @@ ESEDB.prototype = {
         // Deal with null values:
         buffer = null;
       } else {
-        Cu.reportError("Unexpected JET error: " + err + ";" + " retrieving value for column " + column.name);
+        Cu.reportError("Unexpected JET error: " + err + "; retrieving value for column " + column.name);
         throw new Error(convertESEError(err));
       }
     }

browser/components/privatebrowsing/test/browser/browser_privatebrowsing_windowtitle.js

@@ -30,7 +30,7 @@ add_task(function* test() {
   } else {
     page_with_title = test_title + " - " + app_name;
     page_without_title = app_name;
-    about_pb_title = "Open a private window?" + " - " + app_name;
+    about_pb_title = "Open a private window? - " + app_name;
     pb_page_with_title = test_title + " - " + app_name + " (Private Browsing)";
     pb_page_without_title = app_name + " (Private Browsing)";
     pb_about_pb_title = "Private Browsing - " + app_name + " (Private Browsing)";

browser/extensions/pdfjs/test/browser_pdfjs_zoom.js

@@ -72,7 +72,7 @@ add_task(function* test() {
 
   yield BrowserTestUtils.withNewTab({ gBrowser, url: "about:blank" },
     function* (newTabBrowser) {
-      yield waitForPdfJS(newTabBrowser, TESTROOT + "file_pdfjs_test.pdf" + "#zoom=100");
+      yield waitForPdfJS(newTabBrowser, TESTROOT + "file_pdfjs_test.pdf#zoom=100");
 
       yield ContentTask.spawn(newTabBrowser, TESTS, function* (contentTESTS) {
         let document = content.document;

security/manager/ssl/tests/mochitest/mixedcontent/mixedContentTest.js

@@ -161,7 +161,7 @@ function isSecurityState(expectedState, message, test) {
     gotState = "EV";
   }
 
-  test(gotState == expectedState, (message || "") + ", " + "expected " + expectedState + " got " + gotState);
+  test(gotState == expectedState, (message || "") + ", expected " + expectedState + " got " + gotState);
 
   switch (expectedState) {
     case "insecure":

toolkit/.eslintrc.js

@@ -241,6 +241,10 @@ module.exports = {
 
     // Only check typeof against valid results
     "valid-typeof": "error",
+
+    // Don't concatenate string literals together (unless they span multiple
+    // lines)
+    "no-useless-concat": "error",
   },
   "env": {
     "es6": true,

toolkit/components/places/tests/bookmarks/test_1016953-renaming-uncompressed.js

@@ -54,7 +54,7 @@ add_task(function* test_same_date_diff_hash() {
   let {count} = yield BookmarkJSONUtils.exportToFile(tempPath);
   let dateObj = new Date();
   let filename = "bookmarks-" + PlacesBackups.toISODateString(dateObj) + "_" +
-                  count + "_" + "differentHash==" + ".json";
+                  count + "_differentHash==.json";
   let backupFile = OS.Path.join(backupFolder, filename);
   yield OS.File.move(tempPath, backupFile);
   yield PlacesBackups.create(); // Force compressed backup

toolkit/components/places/tests/bookmarks/test_1129529.js

@@ -36,7 +36,7 @@ add_task(function* () {
           index: 1,
           id: 4,
           charset: "UTF-8",
-          tags: "tag1," + "a" + "0123456789".repeat(10), // 101 chars
+          tags: "tag1,a" + "0123456789".repeat(10), // 101 chars
           type: "text/x-moz-place",
           dateAdded: now,
           lastModified: now,

toolkit/components/places/tests/unit/test_preventive_maintenance.js

@@ -1327,7 +1327,7 @@ add_task(function* test_preventive_maintenance() {
   do_check_true(defaultBookmarksMaxId > 0);
 
   for (let test of tests) {
-    dump("\nExecuting test: " + test.name + "\n" + "*** " + test.desc + "\n");
+    dump("\nExecuting test: " + test.name + "\n*** " + test.desc + "\n");
     yield test.setup();
 
     let promiseMaintenanceFinished =

toolkit/components/tooltiptext/tests/browser_bug581947.js

@@ -19,7 +19,7 @@ function check(aBrowser, aElementName, aBarred, aType) {
          "No tooltip should be shown when the element is barred from constraint validation");
     } else {
       ok(tttp.getNodeText(e, {}, {}),
-         e.tagName + " " + "A tooltip should be shown when the element isn't valid");
+         e.tagName + " A tooltip should be shown when the element isn't valid");
     }
 
     e.setAttribute("title", "");

toolkit/content/tests/widgets/test_videocontrols_jsdisabled.html

@@ -56,6 +56,8 @@ function loadevent(event) {
 var win;
 function startTest() {
   var videoURL = new URL("seek_with_sound.ogg", document.documentURI).href;
+
+  // eslint-disable-next-line no-useless-concat
   var url = "data:text/html,<video src=" + videoURL + " controls autoplay=true></video><script>window.testExpando = true;</scr" + "ipt>";
 
   win = window.open(url);

toolkit/modules/Console.jsm

@@ -151,7 +151,7 @@ function stringify(aThing, aAllowNewLines) {
       json = JSON.stringify(aThing);
     } catch (ex) {
       // Can't use a real ellipsis here, because cmd.exe isn't unicode-enabled
-      json = "{" + Object.keys(aThing).join(":..,") + ":.., " + "}";
+      json = "{" + Object.keys(aThing).join(":..,") + ":.., }";
     }
     return type + json;
   }

toolkit/mozapps/extensions/test/xpcshell/test_AddonRepository.js

@@ -305,7 +305,7 @@ function check_results(aActualAddons, aExpectedAddons, aAddonCount, aInstallNull
     if (aActualAddon.name == "FAIL")
       do_throw(aActualAddon.id + " - " + aActualAddon.description);
     if (aActualAddon.name != "PASS")
-      do_throw(aActualAddon.id + " - " + "invalid add-on name " + aActualAddon.name);
+      do_throw(aActualAddon.id + " - invalid add-on name " + aActualAddon.name);
 
     do_check_eq(aActualAddon.install == null, !!aInstallNull || !aActualAddon.sourceURI);
 

toolkit/mozapps/update/nsUpdateService.js

@@ -3996,7 +3996,8 @@ Downloader.prototype = {
     maxFail = Math.min(maxFail, 20);
     LOG("Downloader:onStopRequest - status: " + status + ", " +
         "current fail: " + this.updateService._consecutiveSocketErrors + ", " +
-        "max fail: " + maxFail + ", " + "retryTimeout: " + retryTimeout);
+        "max fail: " + maxFail + ", " +
+        "retryTimeout: " + retryTimeout);
     if (Components.isSuccessCode(status)) {
       if (this._verifyDownload()) {
         if (shouldUseService()) {