1 files changed, 33 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapSnapshot_creationTime_01.js b/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapSnapshot_creationTime_01.js
new file mode 100644
index 0000000000..e18c79752f
--- /dev/null
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/test_HeapSnapshot_creationTime_01.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// HeapSnapshot.prototype.creationTime returns the expected time.
+
+function waitForThirtyMilliseconds() {
+  const start = Date.now();
+  while (Date.now() - start < 30) {
+    // do nothing
+  }
+}
+
+function run_test() {
+  const start = Date.now() * 1000;
+  info("start                 = " + start);
+
+  // Because Date.now() is less precise than the snapshot's time stamp, give it
+  // a little bit of head room. Additionally, WinXP's timer only has granularity
+  // of +/- 15ms.
+  waitForThirtyMilliseconds();
+  const path = ChromeUtils.saveHeapSnapshot({ runtime: true });
+  waitForThirtyMilliseconds();
+
+  const end = Date.now() * 1000;
+  info("end                   = " + end);
+
+  const snapshot = ChromeUtils.readHeapSnapshot(path);
+  info("snapshot.creationTime = " + snapshot.creationTime);
+
+  Assert.greaterOrEqual(snapshot.creationTime, start);
+  Assert.lessOrEqual(snapshot.creationTime, end);
+}