1 files changed, 39 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/tests/unit/test_TelemetryUtils.js b/toolkit/components/telemetry/tests/unit/test_TelemetryUtils.js
new file mode 100644
index 0000000000..fd4cf5304f
--- /dev/null
+++ b/toolkit/components/telemetry/tests/unit/test_TelemetryUtils.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { Preferences } = ChromeUtils.importESModule(
+  "resource://gre/modules/Preferences.sys.mjs"
+);
+const { TelemetryUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/TelemetryUtils.sys.mjs"
+);
+const { UpdateUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/UpdateUtils.sys.mjs"
+);
+
+add_task(async function testUpdateChannelOverride() {
+  if (Preferences.has(TelemetryUtils.Preferences.OverrideUpdateChannel)) {
+    // If the pref is already set at this point, the test is running in a build
+    // that makes use of the override pref. For testing purposes, unset the pref.
+    Preferences.set(TelemetryUtils.Preferences.OverrideUpdateChannel, "");
+  }
+
+  // Check that we return the same channel as UpdateUtils, by default
+  Assert.equal(
+    TelemetryUtils.getUpdateChannel(),
+    UpdateUtils.getUpdateChannel(false),
+    "The telemetry reported channel must match the one from UpdateChannel, by default."
+  );
+
+  // Now set the override pref and check that we return the correct channel
+  const OVERRIDE_TEST_CHANNEL = "nightly-test";
+  Preferences.set(
+    TelemetryUtils.Preferences.OverrideUpdateChannel,
+    OVERRIDE_TEST_CHANNEL
+  );
+  Assert.equal(
+    TelemetryUtils.getUpdateChannel(),
+    OVERRIDE_TEST_CHANNEL,
+    "The telemetry reported channel must match the override pref when pref is set."
+  );
+});