1 files changed, 44 insertions, 0 deletions
diff --git a/dom/heapsnapshot/tests/unit/test_census-tree-node-09.js b/dom/heapsnapshot/tests/unit/test_census-tree-node-09.js
new file mode 100644
index 000000000..3efed04b0
--- /dev/null
+++ 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);
+}