1 files changed, 68 insertions, 0 deletions
diff --git a/devtools/server/tracer/tests/browser/browser_document_tracer.js b/devtools/server/tracer/tests/browser/browser_document_tracer.js
new file mode 100644
index 0000000000..694842fa8b
--- /dev/null
+++ b/devtools/server/tracer/tests/browser/browser_document_tracer.js
@@ -0,0 +1,68 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const JS_CODE = `
+window.onclick = function foo() {
+  setTimeout(function bar() {
+    dump("click and timed out\n");
+  });
+};
+`;
+const TEST_URL =
+  "data:text/html,<!DOCTYPE html><html><script>" + JS_CODE + " </script>";
+
+add_task(async function testTracingWorker() {
+  const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URL);
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+    const {
+      addTracingListener,
+      removeTracingListener,
+      startTracing,
+      stopTracing,
+    } = ChromeUtils.import("resource://devtools/server/tracer/tracer.jsm");
+
+    // We have to fake opening DevTools otherwise DebuggerNotificationObserver wouldn't work
+    // and the tracer wouldn't be able to trace the DOM events.
+    ChromeUtils.notifyDevToolsOpened();
+
+    const frames = [];
+    const listener = {
+      onTracingFrame(frameInfo) {
+        frames.push(frameInfo);
+      },
+    };
+    info("Register a tracing listener");
+    addTracingListener(listener);
+
+    info("Start tracing the iframe");
+    startTracing({ global: content, traceDOMEvents: true });
+
+    info("Dispatch a click event on the iframe");
+    EventUtils.synthesizeMouseAtCenter(
+      content.document.documentElement,
+      {},
+      content
+    );
+
+    info("Wait for the traces generated by this click");
+    await ContentTaskUtils.waitForCondition(() => frames.length == 2);
+
+    const firstFrame = frames[0];
+    is(firstFrame.formatedDisplayName, "λ foo");
+    is(firstFrame.currentDOMEvent, "DOM(click)");
+
+    const lastFrame = frames.at(-1);
+    is(lastFrame.formatedDisplayName, "λ bar");
+    is(lastFrame.currentDOMEvent, "setTimeoutCallback");
+
+    stopTracing();
+    removeTracingListener(listener);
+
+    ChromeUtils.notifyDevToolsClosed();
+  });
+
+  BrowserTestUtils.removeTab(tab);
+});