1 files changed, 44 insertions, 0 deletions
diff --git a/testing/web-platform/tests/compute-pressure/compute_pressure_disconnect.https.any.js b/testing/web-platform/tests/compute-pressure/compute_pressure_disconnect.https.any.js
new file mode 100644
index 0000000000..f8bc3fb357
--- /dev/null
+++ b/testing/web-platform/tests/compute-pressure/compute_pressure_disconnect.https.any.js
@@ -0,0 +1,44 @@
+// 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(() => {
+    assert_unreached('The observer callback should not be called');
+  });
+  t.add_cleanup(() => observer.disconnect());
+  observer.disconnect();
+}, 'Call disconnect() directly should not crash');
+
+pressure_test(async (t, mockPressureService) => {
+  const observer1_changes = [];
+  const observer1 = new PressureObserver(change => {
+    observer1_changes.push(change);
+  });
+  t.add_cleanup(() => observer1.disconnect());
+  // Ensure that observer1's schema gets registered before observer2 starts.
+  await observer1.observe('cpu');
+  observer1.disconnect();
+
+  const observer2_changes = [];
+  await new Promise((resolve, reject) => {
+    const observer2 = new PressureObserver(change => {
+      observer2_changes.push(change);
+      resolve();
+    });
+    t.add_cleanup(() => observer2.disconnect());
+    observer2.observe('cpu').catch(reject);
+    mockPressureService.setPressureUpdate('cpu', 'critical');
+    mockPressureService.startPlatformCollector(/*sampleInterval=*/ 200);
+  });
+
+  assert_equals(
+      observer1_changes.length, 0,
+      'disconnected observers should not receive callbacks');
+
+  assert_equals(observer2_changes.length, 1);
+  assert_equals(observer2_changes[0].length, 1);
+  assert_equals(observer2_changes[0][0].state, 'critical');
+}, 'Stopped PressureObserver do not receive changes');