1 files changed, 49 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTreeNode_LabelAndShallowSize_01.js b/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTreeNode_LabelAndShallowSize_01.js
new file mode 100644
index 0000000000..7d4560e6dc
--- /dev/null
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTreeNode_LabelAndShallowSize_01.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// Test that we can generate label structures from node description reports.
+
+const breakdown = {
+  by: "coarseType",
+  objects: {
+    by: "objectClass",
+    then: { by: "count", count: true, bytes: true },
+    other: { by: "count", count: true, bytes: true },
+  },
+  strings: {
+    by: "internalType",
+    then: { by: "count", count: true, bytes: true },
+  },
+  scripts: {
+    by: "internalType",
+    then: { by: "count", count: true, bytes: true },
+  },
+  other: {
+    by: "internalType",
+    then: { by: "count", count: true, bytes: true },
+  },
+  domNode: {
+    by: "descriptiveType",
+    then: { by: "count", count: true, bytes: true },
+  },
+};
+
+const description = {
+  objects: {
+    Function: { count: 1, bytes: 32 },
+    other: { count: 0, bytes: 0 },
+  },
+  strings: {},
+  scripts: {},
+  other: {},
+  domNode: {},
+};
+
+const expected = ["objects", "Function"];
+
+const shallowSize = 32;
+
+function run_test() {
+  assertLabelAndShallowSize(breakdown, description, shallowSize, expected);
+}