text: // META: title=StorageManager: estimate() should have usage details
  
  promise_test(async t => {
    const estimate = await navigator.storage.estimate();
    assert_equals(typeof estimate, 'object');
    assert_true('usage' in estimate);
    assert_equals(typeof estimate.usage, 'number');
    assert_true('quota' in estimate);
    assert_equals(typeof estimate.quota, 'number');
    assert_true('usageDetails' in estimate);
    assert_equals(typeof estimate.usageDetails, 'object');
  }, 'estimate() resolves to dictionary with members, including usageDetails');
  