1 files changed, 62 insertions, 0 deletions
diff --git a/toolkit/components/places/tests/expiration/test_pref_interval.js b/toolkit/components/places/tests/expiration/test_pref_interval.js
new file mode 100644
index 0000000000..5bf340e7c4
--- /dev/null
+++ b/toolkit/components/places/tests/expiration/test_pref_interval.js
@@ -0,0 +1,62 @@
+/**
+ * What this is aimed to test:
+ *
+ * Expiration relies on an interval, that is user-preffable setting
+ * "places.history.expiration.interval_seconds".
+ * On pref change it will stop current interval timer and fire a new one,
+ * that will obey the new value.
+ * If the pref is set to a number <= 0 we will use the default value.
+ */
+
+// Default timer value for expiration in seconds.  Must have same value as
+// PREF_INTERVAL_SECONDS_NOTSET in nsPlacesExpiration.
+const DEFAULT_TIMER_DELAY_SECONDS = 3 * 60;
+
+// Sync this with the const value in the component.
+const EXPIRE_AGGRESSIVITY_MULTIPLIER = 3;
+
+var tests = [
+  {
+    desc: "Set interval to 1s.",
+    interval: 1,
+    expectedTimerDelay: 1 * EXPIRE_AGGRESSIVITY_MULTIPLIER,
+  },
+
+  {
+    desc: "Set interval to a negative value.",
+    interval: -1,
+    expectedTimerDelay:
+      DEFAULT_TIMER_DELAY_SECONDS * EXPIRE_AGGRESSIVITY_MULTIPLIER,
+  },
+
+  {
+    desc: "Set interval to 0.",
+    interval: 0,
+    expectedTimerDelay:
+      DEFAULT_TIMER_DELAY_SECONDS * EXPIRE_AGGRESSIVITY_MULTIPLIER,
+  },
+
+  {
+    desc: "Set interval to a large value.",
+    interval: 100,
+    expectedTimerDelay: 100 * EXPIRE_AGGRESSIVITY_MULTIPLIER,
+  },
+];
+
+add_task(async function test() {
+  // The pref should not exist by default.
+  Assert.throws(() => getInterval(), /NS_ERROR_UNEXPECTED/);
+
+  // Force the component, so it will start observing preferences.
+  force_expiration_start();
+
+  for (let currentTest of tests) {
+    currentTest = tests.shift();
+    print(currentTest.desc);
+    let promise = promiseTopicObserved("test-interval-changed");
+    setInterval(currentTest.interval);
+    let [, data] = await promise;
+    Assert.equal(data, currentTest.expectedTimerDelay);
+  }
+  clearInterval();
+});