1 files changed, 29 insertions, 0 deletions
diff --git a/testing/web-platform/tests/compute-pressure/compute_pressure_take_records.https.any.js b/testing/web-platform/tests/compute-pressure/compute_pressure_take_records.https.any.js
new file mode 100644
index 0000000000..55660b228b
--- /dev/null
+++ b/testing/web-platform/tests/compute-pressure/compute_pressure_take_records.https.any.js
@@ -0,0 +1,29 @@
+// META: script=/resources/test-only-api.js
+// META: script=resources/pressure-helpers.js
+// META: global=window,dedicatedworker,sharedworker
+
+'use strict';
+
+test(t => {
+  const observer = new PressureObserver(
+      t.unreached_func('This callback should not have been called.'));
+
+  const records = observer.takeRecords();
+  assert_equals(records.length, 0, 'No record before observe');
+}, 'Calling takeRecords() before observe()');
+
+pressure_test(async (t, mockPressureService) => {
+  let observer;
+  const changes = await new Promise(resolve => {
+    observer = new PressureObserver(resolve);
+    t.add_cleanup(() => observer.disconnect());
+
+    observer.observe('cpu');
+    mockPressureService.setPressureUpdate('cpu', 'critical');
+    mockPressureService.startPlatformCollector(/*sampleInterval=*/ 200);
+  });
+  assert_equals(changes[0].state, 'critical');
+
+  const records = observer.takeRecords();
+  assert_equals(records.length, 0, 'No record available');
+}, 'takeRecords() returns empty record after callback invoke');