diff -r 000000000000 -r 6474c204b198 browser/devtools/shared/test/browser_telemetry_button_scratchpad.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/shared/test/browser_telemetry_button_scratchpad.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,155 @@
+/* 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_button_scratchpad.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 = Cu.import("resource://gre/modules/devtools/deprecated-sync-thenables.js", {}).Promise;
+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");
+
+let numScratchpads = 0;
+
+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);
+    }
+  };
+
+  Services.ww.registerNotification(windowObserver);
+  testButton("command-button-scratchpad");
+}
+
+function testButton(id) {
+  info("Testing " + id);
+
+  let target = TargetFactory.forTab(gBrowser.selectedTab);
+
+  gDevTools.showToolbox(target, "inspector").then(function(toolbox) {
+    info("inspector opened");
+
+    let button = toolbox.doc.querySelector("#" + id);
+    ok(button, "Captain, we have the button");
+
+    delayedClicks(button, 4).then(null, console.error);
+  }).then(null, console.error);
+}
+
+function windowObserver(aSubject, aTopic, aData) {
+  if (aTopic == "domwindowopened") {
+    let win = aSubject.QueryInterface(Ci.nsIDOMWindow);
+    win.addEventListener("load", function onLoad() {
+      win.removeEventListener("load", onLoad, false);
+
+      if (win.Scratchpad) {
+        win.Scratchpad.addObserver({
+          onReady: function() {
+            win.Scratchpad.removeObserver(this);
+            numScratchpads++;
+            win.close();
+
+            info("another scratchpad was opened and closed, count is now " + numScratchpads);
+
+            if (numScratchpads === 4) {
+              Services.ww.unregisterNotification(windowObserver);
+              info("4 scratchpads have been opened and closed, checking results");
+              checkResults("_SCRATCHPAD_");
+            }
+          },
+        });
+      }
+    }, false);
+  }
+}
+
+function delayedClicks(node, clicks) {
+  let deferred = promise.defer();
+  let clicked = 0;
+
+  // See TOOL_DELAY for why we need setTimeout here
+  setTimeout(function delayedClick() {
+    info("Clicking button " + node.id);
+    node.click();
+    clicked++;
+
+    if (clicked >= clicks) {
+      deferred.resolve(node);
+    } else {
+      setTimeout(delayedClick, TOOL_DELAY);
+    }
+  }, TOOL_DELAY);
+
+  return deferred.promise;
+}
+
+function checkResults(histIdFocus) {
+  let result = Telemetry.prototype.telemetryInfo;
+
+  for (let [histId, value] of Iterator(result)) {
+    if (histId.startsWith("DEVTOOLS_INSPECTOR_") ||
+        !histId.contains(histIdFocus)) {
+      // Inspector stats are tested in
+      // browser_telemetry_toolboxtabs_{toolname}.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 = numScratchpads = 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;
+}