1 files changed, 37 insertions, 0 deletions
diff --git a/devtools/server/tests/browser/browser_perf-02.js b/devtools/server/tests/browser/browser_perf-02.js
new file mode 100644
index 0000000000..c7276d8a3f
--- /dev/null
+++ b/devtools/server/tests/browser/browser_perf-02.js
@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+/**
+ * Test what happens when other tools control the profiler.
+ */
+add_task(async function () {
+  const { front, client } = await initPerfFront();
+
+  // Simulate other tools by getting an independent handle on the Gecko Profiler.
+  // eslint-disable-next-line mozilla/use-services
+  const geckoProfiler = Cc["@mozilla.org/tools/profiler;1"].getService(
+    Ci.nsIProfiler
+  );
+
+  is(await front.isActive(), false, "The profiler hasn't been started yet.");
+
+  // Start the profiler.
+  await front.startProfiler();
+  is(await front.isActive(), true, "The profiler was started.");
+
+  // Stop the profiler manually through the Gecko Profiler interface.
+  const profilerStopped = once(front, "profiler-stopped");
+  geckoProfiler.StopProfiler();
+  await profilerStopped;
+  is(
+    await front.isActive(),
+    false,
+    "The profiler was stopped by another tool."
+  );
+
+  // Clean up.
+  await front.destroy();
+  await client.close();
+});