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diff --git a/dom/heapsnapshot/tests/unit/test_census-tree-node-09.js b/dom/heapsnapshot/tests/unit/test_census-tree-node-09.js
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+++ b/dom/heapsnapshot/tests/unit/test_census-tree-node-09.js
@@ -0,0 +1,44 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/**
+ * Test that repeatedly converting the same census report to a CensusTreeNode
+ * tree results in the same CensusTreeNode tree.
+ */
+
+function run_test() {
+ const BREAKDOWN = {
+ by: "filename",
+ then: {
+ by: "internalType",
+ then: { by: "count", count: true, bytes: true }
+ },
+ noFilename: {
+ by: "internalType",
+ then: { by: "count", count: true, bytes: true }
+ },
+ };
+
+ const REPORT = {
+ "http://example.com/app.js": {
+ JSScript: { count: 10, bytes: 100 }
+ },
+ "http://example.com/ads.js": {
+ "js::LazyScript": { count: 20, bytes: 200 }
+ },
+ "http://example.com/trackers.js": {
+ JSScript: { count: 30, bytes: 300 }
+ },
+ noFilename: {
+ "js::jit::JitCode": { count: 40, bytes: 400 }
+ }
+ };
+
+ const first = censusReportToCensusTreeNode(BREAKDOWN, REPORT);
+ const second = censusReportToCensusTreeNode(BREAKDOWN, REPORT);
+ const third = censusReportToCensusTreeNode(BREAKDOWN, REPORT);
+
+ assertStructurallyEquivalent(first, second);
+ assertStructurallyEquivalent(second, third);
+}