1 files changed, 20 insertions, 0 deletions
diff --git a/testing/web-platform/tests/storage/estimate-usage-details-caches.https.tentative.any.js b/testing/web-platform/tests/storage/estimate-usage-details-caches.https.tentative.any.js
new file mode 100644
index 0000000000..bf889f8418
--- /dev/null
+++ b/testing/web-platform/tests/storage/estimate-usage-details-caches.https.tentative.any.js
@@ -0,0 +1,20 @@
+// META: title=StorageManager: estimate() for caches
+
+promise_test(async t => {
+  let estimate = await navigator.storage.estimate();
+
+  const cachesUsageBeforeCreate = estimate.usageDetails.caches || 0;
+
+  const cacheName = 'testCache';
+  const cache = await caches.open(cacheName);
+  t.add_cleanup(() => caches.delete(cacheName));
+
+  await cache.put('/test.json', new Response('x'.repeat(1024*1024)));
+
+  estimate = await navigator.storage.estimate();
+  assert_true('caches' in estimate.usageDetails);
+  const cachesUsageAfterPut = estimate.usageDetails.caches;
+  assert_greater_than(
+      cachesUsageAfterPut, cachesUsageBeforeCreate,
+      'estimated usage should increase after value is stored');
+}, 'estimate() shows usage increase after large value is stored');