1 files changed, 47 insertions, 0 deletions
diff --git a/toolkit/components/glean/tests/xpcshell/test_FOGPrefs.js b/toolkit/components/glean/tests/xpcshell/test_FOGPrefs.js
new file mode 100644
index 0000000000..943ffb3186
--- /dev/null
+++ b/toolkit/components/glean/tests/xpcshell/test_FOGPrefs.js
@@ -0,0 +1,47 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TELEMETRY_SERVER_PREF = "toolkit.telemetry.server";
+const UPLOAD_PREF = "datareporting.healthreport.uploadEnabled";
+const LOCALHOST_PREF = "telemetry.fog.test.localhost_port";
+
+// FOG needs a profile directory to put its data in.
+do_get_profile();
+
+// We want Glean to use a localhost server so we can be SURE not to send data to the outside world.
+// Yes, the port spells GLEAN on a T9 keyboard, why do you ask?
+Services.prefs.setIntPref(LOCALHOST_PREF, 45326);
+// We need to initialize it once, otherwise operations will be stuck in the pre-init queue.
+Services.fog.initializeFOG();
+
+add_task(function test_fog_upload_only() {
+  // Don't forget to point the telemetry server to localhost, or Telemetry
+  // might make a non-local connection during the test run.
+  Services.prefs.setStringPref(
+    TELEMETRY_SERVER_PREF,
+    "http://localhost/telemetry-fake/"
+  );
+  // Be sure to set port=-1 for faking success _before_ enabling upload.
+  // Or else there's a short window where we might send something.
+  Services.prefs.setIntPref(LOCALHOST_PREF, -1);
+  Services.prefs.setBoolPref(UPLOAD_PREF, true);
+
+  const value = 42;
+  Glean.testOnly.meaningOfLife.set(value);
+  // We specifically look at the custom ping's value because we know it
+  // won't be reset by being sent.
+  Assert.equal(value, Glean.testOnly.meaningOfLife.testGetValue("test-ping"));
+
+  // Despite upload being disabled, we keep the old values around.
+  Services.prefs.setBoolPref(UPLOAD_PREF, false);
+  Assert.equal(value, Glean.testOnly.meaningOfLife.testGetValue("test-ping"));
+
+  // Now, when we turn the fake upload off, we clear the stores
+  Services.prefs.setIntPref(LOCALHOST_PREF, 0);
+  Assert.equal(
+    undefined,
+    Glean.testOnly.meaningOfLife.testGetValue("test-ping")
+  );
+});