1 files changed, 40 insertions, 0 deletions
diff --git a/testing/web-platform/tests/compute-pressure/compute_pressure_disconnect.tentative.https.window.js b/testing/web-platform/tests/compute-pressure/compute_pressure_disconnect.tentative.https.window.js
new file mode 100644
index 0000000000..c9950f2dc8
--- /dev/null
+++ b/testing/web-platform/tests/compute-pressure/compute_pressure_disconnect.tentative.https.window.js
@@ -0,0 +1,40 @@
+'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');
+
+promise_test(async t => {
+  const observer1_changes = [];
+  const observer1 = new PressureObserver(change => {
+    observer1_changes.push(change);
+  }, {sampleRate: 1.0});
+  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();
+    }, {sampleRate: 1.0});
+    t.add_cleanup(() => observer2.disconnect());
+    observer2.observe('cpu').catch(reject);
+  });
+
+  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_in_array(
+      observer2_changes[0][0].state, ['nominal', 'fair', 'serious', 'critical'],
+      'cpu pressure state');
+}, 'Stopped PressureObserver do not receive changes');