1 files changed, 38 insertions, 0 deletions
diff --git a/testing/web-platform/tests/storage/estimate-usage-details-service-workers.https.tentative.window.js b/testing/web-platform/tests/storage/estimate-usage-details-service-workers.https.tentative.window.js
new file mode 100644
index 0000000000..cf3a2aa943
--- /dev/null
+++ b/testing/web-platform/tests/storage/estimate-usage-details-service-workers.https.tentative.window.js
@@ -0,0 +1,38 @@
+// META: title=StorageManager: estimate() for service worker registrations
+const wait_for_active = worker => new Promise(resolve =>{
+  if (worker.active) { resolve(worker.active); }
+
+  const listen_for_active = worker => e => {
+    if (e.target.state === 'activated') { resolve(worker.active); }
+  }
+
+  if (worker.waiting) {
+    worker.waiting
+        .addEventListener('statechange', listen_for_active(worker.waiting));
+  }
+  if (worker.installing) {
+    worker.installing
+        .addEventListener('statechange', listen_for_active(worker.installing));
+  }
+});
+
+promise_test(async t => {
+  let estimate = await navigator.storage.estimate();
+  const usageBeforeCreate = estimate.usageDetails.serviceWorkerRegistrations ||
+      0;
+  // Note: helpers.js is an arbitrary file; it could be any file that
+  // exists, but this test does not depend on the contents of said file.
+  const serviceWorkerRegistration = await
+      navigator.serviceWorker.register('./helpers.js');
+
+  t.add_cleanup(() => serviceWorkerRegistration.unregister());
+  await wait_for_active(serviceWorkerRegistration);
+
+  estimate = await navigator.storage.estimate();
+  assert_true('serviceWorkerRegistrations' in estimate.usageDetails);
+
+  const usageAfterCreate = estimate.usageDetails.serviceWorkerRegistrations;
+  assert_greater_than(
+      usageAfterCreate, usageBeforeCreate,
+      'estimated usage should increase after service worker is registered');
+}, 'estimate() shows usage increase after large value is stored');