1 files changed, 49 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_watchdog_hibernate.js b/js/xpconnect/tests/unit/test_watchdog_hibernate.js
new file mode 100644
index 0000000000..119cc095e2
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_watchdog_hibernate.js
@@ -0,0 +1,49 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+async function testBody() {
+
+  setWatchdogEnabled(true);
+
+  // It's unlikely that we've ever hibernated at this point, but the timestamps
+  // default to 0, so this should always be true.
+  var now = Date.now() * 1000;
+  var startHibernation = Cu.getWatchdogTimestamp("WatchdogHibernateStart");
+  var stopHibernation = Cu.getWatchdogTimestamp("WatchdogHibernateStop");
+  do_log_info("Pre-hibernation statistics:");
+  do_log_info("now: " + now / 1000000);
+  do_log_info("startHibernation: " + startHibernation / 1000000);
+  do_log_info("stopHibernation: " + stopHibernation / 1000000);
+  Assert.less(startHibernation, now, "startHibernation ok");
+  Assert.less(stopHibernation, now, "stopHibernation ok");
+
+  // When the watchdog runs, it hibernates if there's been no activity for the
+  // last 2 seconds, otherwise it sleeps for 1 second. As such, given perfect
+  // scheduling, we should never have more than 3 seconds of inactivity without
+  // hibernating. To add some padding for automation, we mandate that hibernation
+  // must begin between 2 and 5 seconds from now.
+
+  // Sleep for 10 seconds. Note: we don't use nsITimer here because then we may run
+  // arbitrary (idle) events involving script before it fires.
+  simulateNoScriptActivity(10);
+
+  busyWait(1000); // Give the watchdog time to wake up on the condvar.
+  var stateChange = Cu.getWatchdogTimestamp("ContextStateChange");
+  startHibernation = Cu.getWatchdogTimestamp("WatchdogHibernateStart");
+  stopHibernation = Cu.getWatchdogTimestamp("WatchdogHibernateStop");
+  do_log_info("Post-hibernation statistics:");
+  do_log_info("stateChange: " + stateChange / 1000000);
+  do_log_info("startHibernation: " + startHibernation / 1000000);
+  do_log_info("stopHibernation: " + stopHibernation / 1000000);
+  // XPCOM timers, JS times, and PR_Now() are apparently not directly
+  // comparable, as evidenced by certain seemingly-impossible timing values
+  // that occasionally get logged in windows automation. We're really just
+  // making sure this behavior is roughly as expected on the macro scale,
+  // so we add a 1 second fuzz factor here.
+  const FUZZ_FACTOR = 1 * 1000 * 1000;
+  Assert.greater(stateChange, now + 10*1000*1000 - FUZZ_FACTOR, "stateChange ok");
+  Assert.greater(startHibernation, now + 2*1000*1000 - FUZZ_FACTOR, "startHibernation ok");
+  Assert.less(startHibernation, now + 5*1000*1000 + FUZZ_FACTOR, "startHibernation ok");
+  Assert.greater(stopHibernation, now + 10*1000*1000 - FUZZ_FACTOR, "stopHibernation ok");
+}