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diff --git a/devtools/client/performance/test/browser_perf-options-flatten-tree-recursion-01.js b/devtools/client/performance/test/browser_perf-options-flatten-tree-recursion-01.js
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+++ b/devtools/client/performance/test/browser_perf-options-flatten-tree-recursion-01.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/**
+ * Tests that the js flamegraphs get rerendered when toggling `flatten-tree-recursion`.
+ */
+
+const { SIMPLE_URL } = require("devtools/client/performance/test/helpers/urls");
+const { UI_FLATTEN_RECURSION_PREF } = require("devtools/client/performance/test/helpers/prefs");
+const { initPerformanceInNewTab, teardownToolboxAndRemoveTab } = require("devtools/client/performance/test/helpers/panel-utils");
+const { startRecording, stopRecording } = require("devtools/client/performance/test/helpers/actions");
+const { once } = require("devtools/client/performance/test/helpers/event-utils");
+
+add_task(function* () {
+ let { panel } = yield initPerformanceInNewTab({
+ url: SIMPLE_URL,
+ win: window
+ });
+
+ let {
+ EVENTS,
+ PerformanceController,
+ DetailsView,
+ JsFlameGraphView,
+ FlameGraphUtils
+ } = panel.panelWin;
+
+ Services.prefs.setBoolPref(UI_FLATTEN_RECURSION_PREF, true);
+
+ yield startRecording(panel);
+ yield stopRecording(panel);
+
+ let rendered = once(JsFlameGraphView, EVENTS.UI_JS_FLAMEGRAPH_RENDERED);
+ yield DetailsView.selectView("js-flamegraph");
+ yield rendered;
+
+ let thread1 = PerformanceController.getCurrentRecording().getProfile().threads[0];
+ let rendering1 = FlameGraphUtils._cache.get(thread1);
+
+ ok(thread1,
+ "The samples were retrieved from the controller.");
+ ok(rendering1,
+ "The rendering data was cached.");
+
+ rendered = once(JsFlameGraphView, EVENTS.UI_JS_FLAMEGRAPH_RENDERED);
+ Services.prefs.setBoolPref(UI_FLATTEN_RECURSION_PREF, false);
+ yield rendered;
+ ok(true, "JsFlameGraphView rerendered when toggling flatten-tree-recursion.");
+
+ let thread2 = PerformanceController.getCurrentRecording().getProfile().threads[0];
+ let rendering2 = FlameGraphUtils._cache.get(thread2);
+
+ is(thread1, thread2,
+ "The same samples data should be retrieved from the controller (1).");
+ isnot(rendering1, rendering2,
+ "The rendering data should be different because other options were used (1).");
+
+ rendered = once(JsFlameGraphView, EVENTS.UI_JS_FLAMEGRAPH_RENDERED);
+ Services.prefs.setBoolPref(UI_FLATTEN_RECURSION_PREF, true);
+ yield rendered;
+ ok(true, "JsFlameGraphView rerendered when toggling back flatten-tree-recursion.");
+
+ let thread3 = PerformanceController.getCurrentRecording().getProfile().threads[0];
+ let rendering3 = FlameGraphUtils._cache.get(thread3);
+
+ is(thread2, thread3,
+ "The same samples data should be retrieved from the controller (2).");
+ isnot(rendering2, rendering3,
+ "The rendering data should be different because other options were used (2).");
+
+ yield teardownToolboxAndRemoveTab(panel);
+});