1 files changed, 90 insertions, 0 deletions
diff --git a/xpcom/tests/unit/test_getTimers.js b/xpcom/tests/unit/test_getTimers.js
new file mode 100644
index 0000000000..58a048a4bc
--- /dev/null
+++ b/xpcom/tests/unit/test_getTimers.js
@@ -0,0 +1,90 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+
+const timerManager = Cc["@mozilla.org/timer-manager;1"].getService(
+  Ci.nsITimerManager
+);
+
+function newTimer(name, delay, type) {
+  let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+  timer.initWithCallback(
+    {
+      QueryInterface: ChromeUtils.generateQI(["nsITimerCallback", "nsINamed"]),
+      name,
+      notify: () => {},
+    },
+    delay,
+    type
+  );
+  return timer;
+}
+
+function getTimers() {
+  return timerManager.getTimers().filter(t => {
+    if (t.name == "BackgroundHangThread_timer") {
+      // BHR is Nightly-only, so just ignore it.
+      return false;
+    }
+
+    if (AppConstants.platform == "win" && t.name == "nsAnonTempFileRemover") {
+      // On Windows there's a 3min timer added at startup to then add an
+      // idle observer that finally triggers removing leftover temp files.
+      // Ignore that too.
+      return false;
+    }
+
+    return true;
+  });
+}
+
+function run_test() {
+  {
+    let timers = getTimers();
+    for (let timer of timers) {
+      // Print info about unexpected startup timers to help debugging.
+      info(`${timer.name}: ${timer.delay}ms, ${timer.type}`);
+    }
+    Assert.equal(
+      timers.length,
+      0,
+      "there should be no timer at xpcshell startup"
+    );
+  }
+
+  let timerData = [
+    ["t1", 500, Ci.nsITimer.TYPE_ONE_SHOT],
+    ["t2", 1500, Ci.nsITimer.TYPE_REPEATING_SLACK],
+    ["t3", 2500, Ci.nsITimer.TYPE_REPEATING_PRECISE],
+    ["t4", 3500, Ci.nsITimer.TYPE_REPEATING_PRECISE_CAN_SKIP],
+    ["t5", 5500, Ci.nsITimer.TYPE_REPEATING_SLACK_LOW_PRIORITY],
+    ["t6", 7500, Ci.nsITimer.TYPE_ONE_SHOT_LOW_PRIORITY],
+  ];
+
+  info("Add timers one at a time.");
+  for (let [name, delay, type] of timerData) {
+    let timer = newTimer(name, delay, type);
+    let timers = getTimers();
+    Assert.equal(timers.length, 1, "there should be only one timer");
+    Assert.equal(name, timers[0].name, "the name is correct");
+    Assert.equal(delay, timers[0].delay, "the delay is correct");
+    Assert.equal(type, timers[0].type, "the type is correct");
+
+    timer.cancel();
+    Assert.equal(getTimers().length, 0, "no timer left after cancelling");
+  }
+
+  info("Add all timers at once.");
+  let timers = [];
+  for (let [name, delay, type] of timerData) {
+    timers.push(newTimer(name, delay, type));
+  }
+  while (timers.length) {
+    Assert.equal(getTimers().length, timers.length, "correct timer count");
+    timers.pop().cancel();
+  }
+  Assert.equal(getTimers().length, 0, "no timer left after cancelling");
+}