1 files changed, 57 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapAnalyses_getCreationTime_01.js b/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapAnalyses_getCreationTime_01.js
new file mode 100644
index 0000000000..b52280d970
--- /dev/null
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapAnalyses_getCreationTime_01.js
@@ -0,0 +1,57 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// Test that the HeapAnalyses{Client,Worker} can get a HeapSnapshot's
+// creation time.
+
+function waitForThirtyMilliseconds() {
+  const start = Date.now();
+  while (Date.now() - start < 30) {
+    // do nothing
+  }
+}
+
+const BREAKDOWN = {
+  by: "internalType",
+  then: { by: "count", count: true, bytes: true },
+};
+
+add_task(async function () {
+  const client = new HeapAnalysesClient();
+  const start = Date.now() * 1000;
+
+  // Because Date.now() is less precise than the snapshot's time stamp, give it
+  // a little bit of head room. Additionally, WinXP's timers have a granularity
+  // of only +/-15 ms.
+  waitForThirtyMilliseconds();
+  const snapshotFilePath = saveNewHeapSnapshot();
+  waitForThirtyMilliseconds();
+  const end = Date.now() * 1000;
+
+  await client.readHeapSnapshot(snapshotFilePath);
+  ok(true, "Should have read the heap snapshot");
+
+  let threw = false;
+  try {
+    await client.getCreationTime("/not/a/real/path", {
+      breakdown: BREAKDOWN,
+    });
+  } catch (_) {
+    threw = true;
+  }
+  ok(threw, "getCreationTime should throw when snapshot does not exist");
+
+  const time = await client.getCreationTime(snapshotFilePath, {
+    breakdown: BREAKDOWN,
+  });
+
+  dumpn("Start = " + start);
+  dumpn("End   = " + end);
+  dumpn("Time  = " + time);
+
+  Assert.greaterOrEqual(time, start, "creation time occurred after start");
+  Assert.lessOrEqual(time, end, "creation time occurred before end");
+
+  client.destroy();
+});