1 files changed, 63 insertions, 0 deletions
diff --git a/devtools/server/tests/browser/browser_perf-samples-01.js b/devtools/server/tests/browser/browser_perf-samples-01.js
new file mode 100644
index 000000000..f8f4bf393
--- /dev/null
+++ b/devtools/server/tests/browser/browser_perf-samples-01.js
@@ -0,0 +1,63 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests if the retrieved profiler data samples are correctly filtered and
+ * normalized before passed to consumers.
+ */
+
+const WAIT_TIME = 1000; // ms
+
+const { PerformanceFront } = require("devtools/shared/fronts/performance");
+
+add_task(function* () {
+  let browser = yield addTab(MAIN_DOMAIN + "doc_perf.html");
+  let doc = browser.contentDocument;
+
+  initDebuggerServer();
+  let client = new DebuggerClient(DebuggerServer.connectPipe());
+  let form = yield connectDebuggerClient(client);
+  let front = PerformanceFront(client, form);
+  yield front.connect();
+
+  // Perform the first recording...
+
+  let firstRecording = yield front.startRecording();
+  let firstRecordingStartTime = firstRecording._startTime;
+  info("Started profiling at: " + firstRecordingStartTime);
+
+  busyWait(WAIT_TIME); // allow the profiler module to sample some cpu activity
+
+  yield front.stopRecording(firstRecording);
+
+  ok(firstRecording.getDuration() >= WAIT_TIME,
+    "The first recording duration is correct.");
+
+  // Perform the second recording...
+
+  let secondRecording = yield front.startRecording();
+  let secondRecordingStartTime = secondRecording._startTime;
+  info("Started profiling at: " + secondRecordingStartTime);
+
+  busyWait(WAIT_TIME); // allow the profiler module to sample more cpu activity
+
+  yield front.stopRecording(secondRecording);
+  let secondRecordingProfile = secondRecording.getProfile();
+  let secondRecordingSamples = secondRecordingProfile.threads[0].samples.data;
+
+  ok(secondRecording.getDuration() >= WAIT_TIME,
+    "The second recording duration is correct.");
+
+  const TIME_SLOT = secondRecordingProfile.threads[0].samples.schema.time;
+  ok(secondRecordingSamples[0][TIME_SLOT] < secondRecordingStartTime,
+    "The second recorded sample times were normalized.");
+  ok(secondRecordingSamples[0][TIME_SLOT] > 0,
+    "The second recorded sample times were normalized correctly.");
+  ok(!secondRecordingSamples.find(e => e[TIME_SLOT] + secondRecordingStartTime <= firstRecording.getDuration()),
+    "There should be no samples from the first recording in the second one, " +
+    "even though the total number of frames did not overflow.");
+
+  yield front.destroy();
+  yield client.close();
+  gBrowser.removeCurrentTab();
+});