Implement the Request/Response bits of Background Fetch

third_party/WebKit/LayoutTests/http/tests/background_fetch/resources/background-fetched-event-worker.js

+'use strict';
+
+importScripts('/resources/testharness.js');
+
+test(function() {
+  assert_own_property(self, 'BackgroundFetchedEvent');
+
+  // The `tag` and `completedFetches` are required options in the
+  // BackgroundFetchedEventInit. The latter must be a sequence of
+  // BackgroundFetchSettledRequest instances.
+  assert_throws(null, () => new BackgroundFetchedEvent('BackgroundFetchedEvent'));
+  assert_throws(null, () => new BackgroundFetchedEvent('BackgroundFetchedEvent', {}));
+  assert_throws(null, () => new BackgroundFetchedEvent('BackgroundFetchedEvent', { tag: 'foo' }));
+  assert_throws(null, () => new BackgroundFetchedEvent('BackgroundFetchedEvent', { tag: 'foo', completedFetches: 'bar' }));
+
+  const completedFetches = [
+    new BackgroundFetchSettledRequest(new Request('non-existing-image.png'), new Response()),
+    new BackgroundFetchSettledRequest(new Request('non-existing-image-2.png'), new Response())
+  ];
+
+  const event = new BackgroundFetchedEvent('BackgroundFetchedEvent', {
+    tag: 'my-tag',
+    completedFetches
+  });
+
+  assert_equals(event.type, 'BackgroundFetchedEvent');
+  assert_equals(event.cancelable, false);
+  assert_equals(event.bubbles, false);
+  assert_equals(event.tag, 'my-tag');
+
+  assert_true(Array.isArray(event.completedFetches));
+  assert_array_equals(event.completedFetches, completedFetches);
+
+  assert_inherits(event, 'waitUntil');
+
+}, 'Verifies that the BackgroundFetchedEvent can be constructed.');