palemoon-dev/platform/dom/heapsnapshot/tests/unit/test_HeapAnalyses_takeCensusDiff_01.js

/* Any copyright is dedicated to the Public Domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

// Test that the HeapAnalyses{Client,Worker} can take diffs between censuses.

function run_test() {
  run_next_test();
}

const BREAKDOWN = {
  by: "objectClass",
  then: { by: "count", count: true, bytes: false },
  other: { by: "count", count: true, bytes: false },
};

add_task(function* () {
  const client = new HeapAnalysesClient();

  const markers = [allocationMarker()];

  const firstSnapshotFilePath = saveNewHeapSnapshot();

  // Allocate and hold an additional AllocationMarker object so we can see it in
  // the next heap snapshot.
  markers.push(allocationMarker());

  const secondSnapshotFilePath = saveNewHeapSnapshot();

  yield client.readHeapSnapshot(firstSnapshotFilePath);
  yield client.readHeapSnapshot(secondSnapshotFilePath);
  ok(true, "Should have read both heap snapshot files");

  const { delta } = yield client.takeCensusDiff(firstSnapshotFilePath,
                                                secondSnapshotFilePath,
                                                { breakdown: BREAKDOWN });

  equal(delta.AllocationMarker.count, 1,
    "There exists one new AllocationMarker in the second heap snapshot");

  const { delta: deltaTreeNode } = yield client.takeCensusDiff(firstSnapshotFilePath,
                                                               secondSnapshotFilePath,
                                                               { breakdown: BREAKDOWN },
                                                               { asTreeNode: true });

  // Have to manually set these because symbol properties aren't structured
  // cloned.
  delta[CensusUtils.basisTotalBytes] = deltaTreeNode.totalBytes;
  delta[CensusUtils.basisTotalCount] = deltaTreeNode.totalCount;

  compareCensusViewData(BREAKDOWN, delta, deltaTreeNode,
    "Returning delta-census as a tree node represents same data as the report");

  client.destroy();
});