1 files changed, 44 insertions, 0 deletions
diff --git a/dom/heapsnapshot/tests/unit/test_HeapAnalyses_takeCensus_05.js b/dom/heapsnapshot/tests/unit/test_HeapAnalyses_takeCensus_05.js
new file mode 100644
index 000000000..7e16d9f00
--- /dev/null
+++ b/dom/heapsnapshot/tests/unit/test_HeapAnalyses_takeCensus_05.js
@@ -0,0 +1,44 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that the HeapAnalyses{Client,Worker} can take censuses and return
+// a CensusTreeNode.
+
+function run_test() {
+  run_next_test();
+}
+
+const BREAKDOWN = {
+  by: "internalType",
+  then: { by: "count", count: true, bytes: true }
+};
+
+add_task(function* () {
+  const client = new HeapAnalysesClient();
+
+  const snapshotFilePath = saveNewHeapSnapshot();
+  yield client.readHeapSnapshot(snapshotFilePath);
+  ok(true, "Should have read the heap snapshot");
+
+  const { report } = yield client.takeCensus(snapshotFilePath, {
+    breakdown: BREAKDOWN
+  });
+
+  const { report: treeNode } = yield client.takeCensus(snapshotFilePath, {
+    breakdown: BREAKDOWN
+  }, {
+    asTreeNode: true
+  });
+
+  ok(treeNode.children.length > 0, "treeNode has children");
+  ok(treeNode.children.every(type => {
+    return "name" in type &&
+           "bytes" in type &&
+           "count" in type;
+  }), "all of tree node's children have name, bytes, count");
+
+  compareCensusViewData(BREAKDOWN, report, treeNode,
+    "Returning census as a tree node represents same data as the report");
+
+  client.destroy();
+});