Lo-Fi snackbar should only be shown for the first q=low response of a page

components/data_reduction_proxy/content/browser/content_lofi_ui_service_unittest.cc

+// Copyright 2015 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.
+
+#include "components/data_reduction_proxy/content/browser/content_lofi_ui_service.h"
+
+#include <stddef.h>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/resource_request_info.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/test_renderer_host.h"
+#include "net/socket/socket_test_util.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_test_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace data_reduction_proxy {
+
+class ContentLoFiUIServiceTest : public content::RenderViewHostTestHarness {
+ public:
+  ContentLoFiUIServiceTest() : callback_called_(false) {
+    // Cannot use IO_MAIN_LOOP with RenderViewHostTestHarness.
+    SetThreadBundleOptions(content::TestBrowserThreadBundle::REAL_IO_THREAD);
+  }
+
+  void RunTestOnIOThread(base::RunLoop* ui_run_loop) {
+    DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+    DCHECK(ui_run_loop);

[tbansal1, 2016/01/05 03:10:59]

DCHECK not allowed in tests.

See https://www.chromium.org/developers/coding-style:
"Don't use these macros in tests, as they crash the test binary and leave bots
in a bad state.  Use the ASSERT_xx() and EXPECT_xx() family of macros..."

[megjablon, 2016/01/05 20:13:03]

Done and good to know. We do this in other parts of our code.

+
+    net::TestURLRequestContext context(true);
+    net::MockClientSocketFactory mock_socket_factory;
+    net::TestDelegate delegate;
+    context.set_client_socket_factory(&mock_socket_factory);
+    context.Init();
+
+    content_lofi_ui_service_.reset(new ContentLoFiUIService(
+        content::BrowserThread::GetMessageLoopProxyForThread(
+            content::BrowserThread::UI),
+        base::Bind(
+            &ContentLoFiUIServiceTest::NotifyLoFiResponseReceivedCallback,
+            base::Unretained(this))));
+
+    scoped_ptr<net::URLRequest> request = CreateRequest(context, &delegate);
+
+    content_lofi_ui_service_->NotifyLoFiReponseReceived(*request);
+
+    content::BrowserThread::PostTask(
+        content::BrowserThread::UI, FROM_HERE,
+        base::Bind(&base::RunLoop::Quit, base::Unretained(ui_run_loop)));
+  }
+
+  scoped_ptr<net::URLRequest> CreateRequest(
+      const net::TestURLRequestContext& context,
+      net::TestDelegate* delegate) {
+    DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+
+    scoped_ptr<net::URLRequest> request = context.CreateRequest(
+        GURL("http://www.google.com/"), net::IDLE, delegate);
+
+    content::ResourceRequestInfo::AllocateForTesting(
+        request.get(), content::RESOURCE_TYPE_SUB_FRAME, NULL,
+        web_contents()->GetMainFrame()->GetProcess()->GetID(), -1,
+        web_contents()->GetMainFrame()->GetRoutingID(),
+        false,  // is_main_frame
+        false,  // parent_is_main_frame
+        false,  // allow_download
+        false,  // is_async
+        true);  // is_using_lofi
+
+    return request;
+  }
+
+  void NotifyLoFiResponseReceivedCallback(content::WebContents* web_contents) {
+    DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+    callback_called_ = true;
+  }
+
+  void VerifyNotifyLoFiResponseReceivedCallback() {
+    DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+    EXPECT_TRUE(callback_called_);
+  }
+
+ private:
+  scoped_ptr<ContentLoFiUIService> content_lofi_ui_service_;
+  bool callback_called_;
+};
+
+TEST_F(ContentLoFiUIServiceTest, NotifyLoFiResponseReceived) {
+  base::RunLoop ui_run_loop;
+  content::BrowserThread::PostTask(
+      content::BrowserThread::IO, FROM_HERE,
+      base::Bind(&ContentLoFiUIServiceTest::RunTestOnIOThread,
+                 base::Unretained(this), &ui_run_loop));
+  ui_run_loop.Run();
+  base::MessageLoop::current()->RunUntilIdle();
+  VerifyNotifyLoFiResponseReceivedCallback();
+}
+
+}  // namespace data_reduction_proxy