1 files changed, 43 insertions, 0 deletions
diff --git a/devtools/client/netmonitor/test/browser_net_header-request-priority.js b/devtools/client/netmonitor/test/browser_net_header-request-priority.js
new file mode 100644
index 0000000000..196116a98d
--- /dev/null
+++ b/devtools/client/netmonitor/test/browser_net_header-request-priority.js
@@ -0,0 +1,43 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests if "Request Priority" is displayed in the header panel.
+ */
+add_task(async function () {
+  const { monitor } = await initNetMonitor(POST_RAW_URL, {
+    requestCount: 1,
+  });
+
+  const { document } = monitor.panelWin;
+
+  const waitReq = waitForNetworkEvents(monitor, 1);
+  EventUtils.sendMouseEvent(
+    { type: "click" },
+    document.querySelector(".requests-list-reload-notice-button")
+  );
+  await waitReq;
+
+  // Wait until the tab panel summary is displayed
+  const wait = waitUntil(
+    () => document.querySelectorAll(".tabpanel-summary-label")[0]
+  );
+  EventUtils.sendMouseEvent(
+    { type: "mousedown" },
+    document.querySelectorAll(".request-list-item")[0]
+  );
+  await wait;
+
+  const requestPriorityHeaderExists = Array.from(
+    document.querySelectorAll(".tabpanel-summary-label")
+  ).some(header => header.textContent === "Request Priority");
+  is(
+    requestPriorityHeaderExists,
+    true,
+    '"Request Priority" header is displayed in the header panel.'
+  );
+
+  return teardown(monitor);
+});