1 files changed, 61 insertions, 0 deletions
diff --git a/devtools/client/netmonitor/test/browser_net_telemetry_sidepanel_changed.js b/devtools/client/netmonitor/test/browser_net_telemetry_sidepanel_changed.js
new file mode 100644
index 0000000000..4cb482e569
--- /dev/null
+++ b/devtools/client/netmonitor/test/browser_net_telemetry_sidepanel_changed.js
@@ -0,0 +1,61 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const ALL_CHANNELS = Ci.nsITelemetry.DATASET_ALL_CHANNELS;
+
+/**
+ * Test the sidepanel_changed telemetry event.
+ */
+add_task(async function () {
+  const { monitor } = await initNetMonitor(HTTPS_SIMPLE_URL, {
+    requestCount: 1,
+  });
+  info("Starting test... ");
+
+  const { document, store, windowRequire } = monitor.panelWin;
+  const Actions = windowRequire("devtools/client/netmonitor/src/actions/index");
+  store.dispatch(Actions.batchEnable(false));
+
+  // Remove all telemetry events (you can check about:telemetry).
+  Services.telemetry.clearEvents();
+
+  // Ensure no events have been logged
+  const snapshot = Services.telemetry.snapshotEvents(ALL_CHANNELS, true);
+  ok(!snapshot.parent, "No events have been logged for the main process");
+
+  // Reload to have one request in the list.
+  const waitForEvents = waitForNetworkEvents(monitor, 1);
+  await navigateTo(HTTPS_SIMPLE_URL);
+  await waitForEvents;
+
+  // Click on a request and wait till the default "Headers" side panel is opened.
+  info("Click on a request");
+  const waitForHeaders = waitUntil(() =>
+    document.querySelector(".headers-overview")
+  );
+  EventUtils.sendMouseEvent(
+    { type: "mousedown" },
+    document.querySelectorAll(".request-list-item")[0]
+  );
+  await waitForHeaders;
+  await waitForRequestData(store, ["requestHeaders", "responseHeaders"]);
+
+  // Click on the Cookies panel and wait till it's opened.
+  info("Click on the Cookies panel");
+  clickOnSidebarTab(document, "cookies");
+  await waitForRequestData(store, ["requestCookies", "responseCookies"]);
+
+  checkTelemetryEvent(
+    {
+      oldpanel: "headers",
+      newpanel: "cookies",
+    },
+    {
+      method: "sidepanel_changed",
+    }
+  );
+
+  return teardown(monitor);
+});