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-rw-r--r--startupcache/test/browser/browser.ini1
-rw-r--r--startupcache/test/browser/browser_startupcache_telemetry.js50
2 files changed, 51 insertions, 0 deletions
diff --git a/startupcache/test/browser/browser.ini b/startupcache/test/browser/browser.ini
new file mode 100644
index 0000000000..cd4a5cbbe6
--- /dev/null
+++ b/startupcache/test/browser/browser.ini
@@ -0,0 +1 @@
+[browser_startupcache_telemetry.js]
diff --git a/startupcache/test/browser/browser_startupcache_telemetry.js b/startupcache/test/browser/browser_startupcache_telemetry.js
new file mode 100644
index 0000000000..e4c8085bed
--- /dev/null
+++ b/startupcache/test/browser/browser_startupcache_telemetry.js
@@ -0,0 +1,50 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const LABELS_STARTUP_CACHE_REQUESTS = {
+ HitMemory: 0,
+ HitDisk: 1,
+ Miss: 2,
+};
+
+add_task(async function () {
+ // Turn off tab preloading to avoid issues with RemoteController.js
+ await SpecialPowers.pushPrefEnv({
+ set: [["browser.newtab.preload", false]],
+ });
+
+ Services.obs.notifyObservers(null, "startupcache-invalidate");
+ Services.telemetry.getSnapshotForHistograms("main", true);
+ let newWin = await BrowserTestUtils.openNewBrowserWindow();
+ let snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
+ function histValue(label) {
+ return snapshot.parent.STARTUP_CACHE_REQUESTS.values[label] || 0;
+ }
+ Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
+ Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
+ Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 0);
+ await BrowserTestUtils.closeWindow(newWin);
+
+ newWin = await BrowserTestUtils.openNewBrowserWindow();
+ snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
+ Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
+ Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
+
+ // Here and below, 50 is just a nice round number that should be well over
+ // what we should observe under normal circumstances, and well under what
+ // we should see if something is seriously wrong. It won't catch everything,
+ // but it's better than nothing, and better than a test that cries wolf.
+ Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 50);
+ await BrowserTestUtils.closeWindow(newWin);
+
+ Services.obs.notifyObservers(null, "startupcache-invalidate", "memoryOnly");
+ newWin = await BrowserTestUtils.openNewBrowserWindow();
+ snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
+ Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 50);
+ Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
+ // Some misses can come through - just ensure it's a small number
+ Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 50);
+ await BrowserTestUtils.closeWindow(newWin);
+});