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-rw-r--r--dom/heapsnapshot/tests/unit/test_HeapAnalyses_takeCensusDiff_01.js54
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diff --git a/dom/heapsnapshot/tests/unit/test_HeapAnalyses_takeCensusDiff_01.js b/dom/heapsnapshot/tests/unit/test_HeapAnalyses_takeCensusDiff_01.js
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+++ b/dom/heapsnapshot/tests/unit/test_HeapAnalyses_takeCensusDiff_01.js
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+/* 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();
+});