CookieStore: WPT to verify subscribe/unsubscribe is idempotent

This change adds a wpt to test that subscribe/unsubscribe
is idempotent.

Bug: 729800
Change-Id: I3744b06ea53c4839ac1f82f3fd2241d0bd4d9e2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207584
Commit-Queue: Ayu Ishii <ayui@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770412}

third_party/blink/web_tests/external/wpt/cookie-store/cookieStore_subscribe_arguments.tentative.https.any.js

@@ -64,3 +64,86 @@ promise_test(async testCase => {
       registration.cookies.subscribe(
           { name: 'cookie-name', matchType: 'equals', url: '/wrong/path' }));
 }, 'cookieStore.subscribe with invalid url path in option');
+
+promise_test(async testCase => {
+  if (self.GLOBAL.isWindow()) {
+    const registration = await service_worker_unregister_and_register(
+        testCase, 'resources/empty_sw.js',
+        '/cookie-store/resources/does/not/exist');
+    testCase.add_cleanup(() => registration.unregister());
+
+    // Must wait for the service worker to enter the 'activated' state before
+    // subscribing to cookiechange events.
+    await wait_for_state(testCase, registration.installing, 'activated');
+
+    self.registration = registration;
+  } else if (!self.registration.active) {
+    // Must wait for the service worker to enter the 'activated' state before
+    // subscribing to cookiechange events.
+    await new Promise(resolve => {
+      self.addEventListener('activate', event => { resolve(); });
+    });
+  }
+
+  {
+    const subscriptions = [
+      { name: 'cookie-name', matchType: 'equals' }
+    ];
+    // Call subscribe for same subscription multiple times to verify that it is
+    // idempotent.
+    await self.registration.cookies.subscribe(subscriptions);
+    await self.registration.cookies.subscribe(subscriptions);
+    await self.registration.cookies.subscribe(subscriptions);
+    testCase.add_cleanup(() => registration.cookies.unsubscribe(subscriptions));
+  }
+
+  const subscriptions = await registration.cookies.getSubscriptions();
+  assert_equals(subscriptions.length, 1);
+
+  assert_equals(subscriptions[0].name, 'cookie-name');
+  assert_equals(subscriptions[0].matchType, 'equals');
+  assert_equals(subscriptions[0].url, registration.scope);
+}, 'cookieStore.subscribe is idempotent');
+
+promise_test(async testCase => {
+  if (self.GLOBAL.isWindow()) {
+    const registration = await service_worker_unregister_and_register(
+        testCase, 'resources/empty_sw.js',
+        '/cookie-store/resources/does/not/exist');
+    testCase.add_cleanup(() => registration.unregister());
+
+    // Must wait for the service worker to enter the 'activated' state before
+    // subscribing to cookiechange events.
+    await wait_for_state(testCase, registration.installing, 'activated');
+
+    self.registration = registration;
+  } else if (!self.registration.active) {
+    // Must wait for the service worker to enter the 'activated' state before
+    // subscribing to cookiechange events.
+    await new Promise(resolve => {
+      self.addEventListener('activate', event => { resolve(); });
+    });
+  }
+
+  {
+    const subscriptions = [
+      { name: 'cookie-name1', matchType: 'equals' },
+      { name: 'cookie-name2', matchType: 'equals' }
+    ];
+    await self.registration.cookies.subscribe(subscriptions);
+    testCase.add_cleanup(() => registration.cookies.unsubscribe(subscriptions));
+
+    // Call unsubscribe for same subscription multiple times to verify that it
+    // is idempotent.
+    await registration.cookies.unsubscribe([subscriptions[0]]);
+    await registration.cookies.unsubscribe([subscriptions[0]]);
+    await registration.cookies.unsubscribe([subscriptions[0]]);
+  }
+
+  const subscriptions = await registration.cookies.getSubscriptions();
+  assert_equals(subscriptions.length, 1);
+
+  assert_equals(subscriptions[0].name, 'cookie-name2');
+  assert_equals(subscriptions[0].matchType, 'equals');
+  assert_equals(subscriptions[0].url, registration.scope);
+}, 'CookieStore.unsubscribe is idempotent');