diff -r 000000000000 -r 6474c204b198 browser/devtools/shared/test/browser_telemetry_sidebar.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/shared/test/browser_telemetry_sidebar.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,115 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TEST_URI = "data:text/html;charset=utf-8,<p>browser_telemetry_sidebar.js</p>";
+
+// Because we need to gather stats for the period of time that a tool has been
+// opened we make use of setTimeout() to create tool active times.
+const TOOL_DELAY = 200;
+
+let {Promise: promise} = Cu.import("resource://gre/modules/devtools/deprecated-sync-thenables.js", {});
+let {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
+
+let require = Cu.import("resource://gre/modules/devtools/Loader.jsm", {}).devtools.require;
+let Telemetry = require("devtools/shared/telemetry");
+
+function init() {
+  Telemetry.prototype.telemetryInfo = {};
+  Telemetry.prototype._oldlog = Telemetry.prototype.log;
+  Telemetry.prototype.log = function(histogramId, value) {
+    if (histogramId) {
+      if (!this.telemetryInfo[histogramId]) {
+        this.telemetryInfo[histogramId] = [];
+      }
+
+      this.telemetryInfo[histogramId].push(value);
+    }
+  };
+
+  testSidebar();
+}
+
+function testSidebar() {
+  info("Testing sidebar");
+
+  let target = TargetFactory.forTab(gBrowser.selectedTab);
+
+  gDevTools.showToolbox(target, "inspector").then(function(toolbox) {
+    let inspector = toolbox.getCurrentPanel();
+    let sidebarTools = ["ruleview", "computedview", "fontinspector", "layoutview"];
+
+    // Concatenate the array with itself so that we can open each tool twice.
+    sidebarTools.push.apply(sidebarTools, sidebarTools);
+
+    // See TOOL_DELAY for why we need setTimeout here
+    setTimeout(function selectSidebarTab() {
+      let tool = sidebarTools.pop();
+      if (tool) {
+        inspector.sidebar.select(tool);
+        setTimeout(function() {
+          setTimeout(selectSidebarTab, TOOL_DELAY);
+        }, TOOL_DELAY);
+      } else {
+        checkResults();
+      }
+    }, TOOL_DELAY);
+  });
+}
+
+function checkResults() {
+  let result = Telemetry.prototype.telemetryInfo;
+
+  for (let [histId, value] of Iterator(result)) {
+    if (histId.startsWith("DEVTOOLS_INSPECTOR_")) {
+      // Inspector stats are tested in browser_telemetry_toolboxtabs.js so we
+      // skip them here because we only open the inspector once for this test.
+      continue;
+    }
+
+    if (histId.endsWith("OPENED_PER_USER_FLAG")) {
+      ok(value.length === 1 && value[0] === true,
+         "Per user value " + histId + " has a single value of true");
+    } else if (histId.endsWith("OPENED_BOOLEAN")) {
+      ok(value.length > 1, histId + " has more than one entry");
+
+      let okay = value.every(function(element) {
+        return element === true;
+      });
+
+      ok(okay, "All " + histId + " entries are === true");
+    } else if (histId.endsWith("TIME_ACTIVE_SECONDS")) {
+      ok(value.length > 1, histId + " has more than one entry");
+
+      let okay = value.every(function(element) {
+        return element > 0;
+      });
+
+      ok(okay, "All " + histId + " entries have time > 0");
+    }
+  }
+
+  finishUp();
+}
+
+function finishUp() {
+  gBrowser.removeCurrentTab();
+
+  Telemetry.prototype.log = Telemetry.prototype._oldlog;
+  delete Telemetry.prototype._oldlog;
+  delete Telemetry.prototype.telemetryInfo;
+
+  TargetFactory = Services = promise = require = null;
+
+  finish();
+}
+
+function test() {
+  waitForExplicitFinish();
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", function() {
+    gBrowser.selectedBrowser.removeEventListener("load", arguments.callee, true);
+    waitForFocus(init, content);
+  }, true);
+
+  content.location = TEST_URI;
+}