1 files changed, 114 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapAnalyses_takeCensus_06.js b/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapAnalyses_takeCensus_06.js
new file mode 100644
index 0000000000..d9fdaa3708
--- /dev/null
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapAnalyses_takeCensus_06.js
@@ -0,0 +1,114 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// Test that the HeapAnalyses{Client,Worker} can take censuses by
+// "allocationStack" and return a CensusTreeNode.
+
+const BREAKDOWN = {
+  by: "objectClass",
+  then: {
+    by: "allocationStack",
+    then: { by: "count", count: true, bytes: true },
+    noStack: { by: "count", count: true, bytes: true },
+  },
+  other: { by: "count", count: true, bytes: true },
+};
+
+add_task(async function () {
+  const g = newGlobal();
+  const dbg = new Debugger(g);
+
+  // 5 allocation markers with no stack.
+  g.eval(`
+         this.markers = [];
+         for (var i = 0; i < 5; i++) {
+           markers.push(allocationMarker());
+         }
+         `);
+
+  dbg.memory.allocationSamplingProbability = 1;
+  dbg.memory.trackingAllocationSites = true;
+
+  // 5 allocation markers at 5 stacks.
+  g.eval(`
+         (function shouldHaveCountOfOne() {
+           markers.push(allocationMarker());
+           markers.push(allocationMarker());
+           markers.push(allocationMarker());
+           markers.push(allocationMarker());
+           markers.push(allocationMarker());
+         }());
+         `);
+
+  // 5 allocation markers at 1 stack.
+  g.eval(`
+         (function shouldHaveCountOfFive() {
+           for (var i = 0; i < 5; i++) {
+             markers.push(allocationMarker());
+           }
+         }());
+         `);
+
+  const snapshotFilePath = saveNewHeapSnapshot({ debugger: dbg });
+
+  const client = new HeapAnalysesClient();
+  await client.readHeapSnapshot(snapshotFilePath);
+  ok(true, "Should have read the heap snapshot");
+
+  const { report } = await client.takeCensus(snapshotFilePath, {
+    breakdown: BREAKDOWN,
+  });
+
+  const { report: treeNode } = await client.takeCensus(
+    snapshotFilePath,
+    {
+      breakdown: BREAKDOWN,
+    },
+    {
+      asTreeNode: true,
+    }
+  );
+
+  const markers = treeNode.children.find(c => c.name === "AllocationMarker");
+  ok(markers);
+
+  const noStack = markers.children.find(c => c.name === "noStack");
+  equal(noStack.count, 5);
+
+  let numShouldHaveFiveFound = 0;
+  let numShouldHaveOneFound = 0;
+
+  function walk(node) {
+    if (node.children) {
+      node.children.forEach(walk);
+    }
+
+    if (!isSavedFrame(node.name)) {
+      return;
+    }
+
+    if (node.name.functionDisplayName === "shouldHaveCountOfFive") {
+      equal(node.count, 5, "shouldHaveCountOfFive should have count of five");
+      numShouldHaveFiveFound++;
+    }
+
+    if (node.name.functionDisplayName === "shouldHaveCountOfOne") {
+      equal(node.count, 1, "shouldHaveCountOfOne should have count of one");
+      numShouldHaveOneFound++;
+    }
+  }
+  markers.children.forEach(walk);
+
+  equal(numShouldHaveFiveFound, 1);
+  equal(numShouldHaveOneFound, 5);
+
+  compareCensusViewData(
+    BREAKDOWN,
+    report,
+    treeNode,
+    "Returning census as a tree node represents same data as the report"
+  );
+
+  client.destroy();
+});