1 files changed, 77 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/test_census-tree-node-01.js b/devtools/shared/heapsnapshot/tests/xpcshell/test_census-tree-node-01.js
new file mode 100644
index 0000000000..625d359675
--- /dev/null
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/test_census-tree-node-01.js
@@ -0,0 +1,77 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/**
+ * Tests CensusTreeNode with `internalType` breakdown.
+ */
+
+const BREAKDOWN = {
+  by: "internalType",
+  then: { by: "count", count: true, bytes: true },
+};
+
+const REPORT = {
+  JSObject: {
+    bytes: 100,
+    count: 10,
+  },
+  "js::Shape": {
+    bytes: 500,
+    count: 50,
+  },
+  JSString: {
+    bytes: 10,
+    count: 1,
+  },
+};
+
+const EXPECTED = {
+  name: null,
+  bytes: 0,
+  totalBytes: 610,
+  count: 0,
+  totalCount: 61,
+  children: [
+    {
+      name: "js::Shape",
+      bytes: 500,
+      totalBytes: 500,
+      count: 50,
+      totalCount: 50,
+      children: undefined,
+      id: 3,
+      parent: 1,
+      reportLeafIndex: 2,
+    },
+    {
+      name: "JSObject",
+      bytes: 100,
+      totalBytes: 100,
+      count: 10,
+      totalCount: 10,
+      children: undefined,
+      id: 2,
+      parent: 1,
+      reportLeafIndex: 1,
+    },
+    {
+      name: "JSString",
+      bytes: 10,
+      totalBytes: 10,
+      count: 1,
+      totalCount: 1,
+      children: undefined,
+      id: 4,
+      parent: 1,
+      reportLeafIndex: 3,
+    },
+  ],
+  id: 1,
+  parent: undefined,
+  reportLeafIndex: undefined,
+};
+
+function run_test() {
+  compareCensusViewData(BREAKDOWN, REPORT, EXPECTED);
+}