Save favicon during reading list distillation

ios/chrome/browser/dom_distiller/favicon_web_state_dispatcher_impl_unittest.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/chrome/browser/dom_distiller/favicon_web_state_dispatcher_impl.h"
+
+#include "base/memory/ptr_util.h"
+#include "components/favicon/ios/web_favicon_driver.h"
+#include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
+#import "ios/testing/wait_util.h"
+#include "ios/web/public/test/test_web_thread_bundle.h"
+#include "ios/web/public/web_state/web_state_observer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
+
+namespace dom_distiller {
+
+// Test class.
+class FaviconWebStateDispatcherTest : public PlatformTest {
+ public:
+  FaviconWebStateDispatcherTest() : web_state_destroyed_(false) {
+    TestChromeBrowserState::Builder builder;
+    browser_state_ = builder.Build();
+  }
+
+  web::BrowserState* GetBrowserState() { return browser_state_.get(); }
+
+  bool IsWebStateDestroyed() { return web_state_destroyed_; }
+  void WebStateDestroyed() { web_state_destroyed_ = true; }
+
+ private:
+  web::TestWebThreadBundle thread_bundle_;
+  std::unique_ptr<TestChromeBrowserState> browser_state_;
+  bool web_state_destroyed_;
+};
+
+// Observer for the test.
+class TestFaviconWebStateDispatcherObserver : public web::WebStateObserver {
+ public:
+  TestFaviconWebStateDispatcherObserver(web::WebState* web_state,
+                                        FaviconWebStateDispatcherTest* owner)
+      : web::WebStateObserver(web_state), owner_(owner) {}
+
+  // WebStateObserver implementation:
+  void WebStateDestroyed() override { owner_->WebStateDestroyed(); };
+
+ private:
+  FaviconWebStateDispatcherTest* owner_;  // weak, owns this object.
+};
+
+// Tests that RequestWebState returns a WebState with a FaviconDriver attached.
+TEST_F(FaviconWebStateDispatcherTest, RequestWebState) {
+  FaviconWebStateDispatcherImpl dispatcher(GetBrowserState(), -1);
+  web::WebState* web_state = dispatcher.RequestWebState();
+
+  favicon::WebFaviconDriver* driver =
+      favicon::WebFaviconDriver::FromWebState(web_state);
+  EXPECT_NE(driver, nullptr);
+}
+
+// Tests that the WebState returned will be destroyed after a delay.
+TEST_F(FaviconWebStateDispatcherTest, ReturnWebState) {
+  FaviconWebStateDispatcherImpl dispatcher(GetBrowserState(), 0);
+  web::WebState* web_state = dispatcher.RequestWebState();
+
+  TestFaviconWebStateDispatcherObserver observer(web_state, this);
+
+  ConditionBlock condition = ^{
+    return IsWebStateDestroyed();
+  };
+
+  dispatcher.ReturnWebState(web_state);
+
+  ASSERT_TRUE(testing::WaitUntilConditionOrTimeout(0.5, condition));
+}
+}  // namespace dom_distiller