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diff --git a/devtools/client/performance/test/browser_perf-tree-view-05.js b/devtools/client/performance/test/browser_perf-tree-view-05.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/**
+ * Tests if the profiler's tree view implementation works properly and
+ * can toggle categories hidden or visible.
+ */
+
+const { ThreadNode } = require("devtools/client/performance/modules/logic/tree-model");
+const { CallView } = require("devtools/client/performance/modules/widgets/tree-view");
+const { synthesizeProfile } = require("devtools/client/performance/test/helpers/synth-utils");
+
+add_task(function () {
+ let profile = synthesizeProfile();
+ let threadNode = new ThreadNode(profile.threads[0], { startTime: 0, endTime: 20 });
+
+ // Don't display the synthesized (root) and the real (root) node twice.
+ threadNode.calls = threadNode.calls[0].calls;
+
+ let treeRoot = new CallView({ frame: threadNode });
+ let container = document.createElement("vbox");
+ treeRoot.attachTo(container);
+
+ let categories = container.querySelectorAll(".call-tree-category");
+ is(categories.length, 6,
+ "The call tree displays a correct number of categories.");
+ ok(!container.hasAttribute("categories-hidden"),
+ "All categories should be visible in the tree.");
+
+ treeRoot.toggleCategories(false);
+ is(categories.length, 6,
+ "The call tree displays the same number of categories.");
+ ok(container.hasAttribute("categories-hidden"),
+ "All categories should now be hidden in the tree.");
+});