Bug 1603182: Add a test for target-switching of performance panel. r=julienw

Depends on D68537

Differential Revision: https://phabricator.services.mozilla.com/D69488

--HG--
extra : moz-landing-system : lando

devtools/client/performance/test/browser.ini

@@ -16,7 +16,7 @@ support-files =
 [browser_aaa-run-first-leaktest.js]
 [browser_perf-button-states.js]
 [browser_perf-calltree-js-categories.js]
-skip-if = (os == 'win' && os_version == '10.0' && bits == 64 && !asan) # Bug 1466377 
+skip-if = (os == 'win' && os_version == '10.0' && bits == 64 && !asan) # Bug 1466377
 [browser_perf-calltree-js-columns.js]
 [browser_perf-calltree-js-events.js]
 [browser_perf-calltree-memory-columns.js]
@@ -42,6 +42,7 @@ skip-if = (os == 'win' && os_version == '10.0' && bits == 64 && !asan) # Bug 146
 [browser_perf-details-render-03-memory-calltree.js]
 [browser_perf-details-render-04-memory-flamegraph.js]
 [browser_perf-docload.js]
+[browser_perf-fission-switch-target.js]
 [browser_perf-highlighted.js]
 [browser_perf-loading-01.js]
 [browser_perf-loading-02.js]

devtools/client/performance/test/browser_perf-fission-switch-target.js

@@ -0,0 +1,62 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/**
+ * Test behavior while target-switching.
+ */
+
+const {
+  MAIN_PROCESS_URL,
+  SIMPLE_URL: CONTENT_PROCESS_URL,
+} = require("devtools/client/performance/test/helpers/urls");
+const {
+  BrowserTestUtils,
+} = require("resource://testing-common/BrowserTestUtils.jsm");
+const {
+  addTab,
+} = require("devtools/client/performance/test/helpers/tab-utils");
+const {
+  initPerformanceInTab,
+  teardownToolboxAndRemoveTab,
+} = require("devtools/client/performance/test/helpers/panel-utils");
+const {
+  startRecording,
+  stopRecording,
+} = require("devtools/client/performance/test/helpers/actions");
+
+add_task(async function() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["devtools.target-switching.enabled", true]],
+  });
+
+  info("Open a page running on content process");
+  const tab = await addTab({
+    url: CONTENT_PROCESS_URL,
+    win: window,
+  });
+
+  info("Open the performance panel");
+  const { panel } = await initPerformanceInTab({ tab });
+  const { PerformanceController, PerformanceView, EVENTS } = panel.panelWin;
+
+  info("Start recording");
+  await startRecording(panel);
+  await PerformanceView.once(EVENTS.UI_RECORDING_PROFILER_STATUS_RENDERED);
+
+  info("Navigate to a page running on main process");
+  await BrowserTestUtils.loadURI(tab.linkedBrowser, MAIN_PROCESS_URL);
+  await PerformanceView.once(EVENTS.UI_RECORDING_PROFILER_STATUS_RENDERED);
+
+  info("Return to a page running on content process again");
+  await BrowserTestUtils.loadURI(tab.linkedBrowser, CONTENT_PROCESS_URL);
+  await PerformanceView.once(EVENTS.UI_RECORDING_PROFILER_STATUS_RENDERED);
+
+  info("Stop recording");
+  await stopRecording(panel);
+
+  const recordings = PerformanceController.getRecordings();
+  is(recordings.length, 3, "Have a record for every target-switching");
+
+  await teardownToolboxAndRemoveTab(panel);
+});

devtools/client/performance/test/helpers/urls.js

@@ -5,3 +5,5 @@
 exports.EXAMPLE_URL =
   "http://example.com/browser/devtools/client/performance/test";
 exports.SIMPLE_URL = `${exports.EXAMPLE_URL}/doc_simple-test.html`;
+// Used to test a page running on main process.
+exports.MAIN_PROCESS_URL = "about:robots";