1 files changed, 49 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/tests/unit/test_SocketScalars.js b/toolkit/components/telemetry/tests/unit/test_SocketScalars.js
new file mode 100644
index 0000000000..a685a611b2
--- /dev/null
+++ b/toolkit/components/telemetry/tests/unit/test_SocketScalars.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/
+*/
+
+const { TelemetryController } = ChromeUtils.importESModule(
+  "resource://gre/modules/TelemetryController.sys.mjs"
+);
+const { ContentTaskUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/ContentTaskUtils.sys.mjs"
+);
+
+const SOCKET_ONLY_UINT_SCALAR = "telemetry.test.socket_only_uint";
+
+/**
+ * This function waits until socket scalars are reported into the
+ * scalar snapshot.
+ */
+async function waitForSocketScalars() {
+  await ContentTaskUtils.waitForCondition(() => {
+    const scalars = Telemetry.getSnapshotForScalars("main", false);
+    return Object.keys(scalars).includes("socket");
+  }, "Waiting for socket scalars to have been set");
+}
+
+add_task(async function test_scalars_in_socket_process() {
+  Assert.ok(
+    Services.prefs.getBoolPref("network.process.enabled"),
+    "Socket process should be enabled"
+  );
+
+  do_get_profile(true);
+  await TelemetryController.testSetup();
+
+  Services.io.socketProcessTelemetryPing();
+
+  // Once scalars are set by the socket process, they don't immediately get
+  // sent to the parent process. Wait for the Telemetry IPC Timer to trigger
+  // and batch send the data back to the parent process.
+  // Note: this requires the socket process to be enabled (see bug 1716307).
+  await waitForSocketScalars();
+
+  Assert.equal(
+    Telemetry.getSnapshotForScalars("main", false).socket[
+      SOCKET_ONLY_UINT_SCALAR
+    ],
+    42,
+    `${SOCKET_ONLY_UINT_SCALAR} must have the correct value (socket process).`
+  );
+});