[Blimp] Refactor Blimp test engine with embedded test server and URL rewriting

blimp/engine/testing/app/blimp_url_rewriter_unittest.cc

+// Copyright (c) 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.
+
+#include "blimp/engine/testing/app/blimp_url_rewriter.h"
+
+#include <iostream>
+#include <string>
+
+#include "blimp/engine/app/blimp_content_browser_client.h"
+#include "blimp/engine/common/blimp_content_client.h"
+#include "content/browser/browser_url_handler_impl.h"
+#include "content/public/browser/content_browser_client.h"
+#include "content/public/test/test_browser_context.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+#include "url/third_party/mozilla/url_parse.h"
+
+const base::FilePath::CharType kBlimpTestRoot[] = FILE_PATH_LITERAL("");
+
+namespace blimp {
+namespace engine {
+
+namespace test {
+
+class BlimpUrlRewriterTest : public testing::Test {
+ protected:
+  void SetUp() override {
+    g_ets_instance.reset(new net::EmbeddedTestServer());
+    g_ets_instance->ServeFilesFromSourceDirectory(
+        base::FilePath(kBlimpTestRoot));
+    ASSERT_TRUE(g_ets_instance->Start());
+
+    content::SetContentClient(&content_client_);
+    browser_client_.reset(new BlimpContentBrowserClient);

[shenghuazhang, 2017/01/05 23:36:33]

Failed to set up contentclient and browser causes
BrowserURLHandler::GetInstance() failed below.

Know that blimp engine delegate is responsible to do that, but not sure how to
set up this in the test Setup function:
https://cs.chromium.org/chromium/src/blimp/engine/app/blimp_content_main_dele...

[jbudorick at gmail, 2017/01/06 16:09:37]

Can you set content_client_->browser e.g.
https://codesearch.chromium.org/chromium/src/content/app/content_main_runner....
?

[shenghuazhang, 2017/01/07 01:21:24]

I'm afraid it's not able to do in this way, since the browser is a private
variable for ContentClient.

Just found an example which worked in this case:
https://codesearch.chromium.org/chromium/src/content/public/test/test_content...

+  }
+
+  void TearDown() override {
+    if (g_ets_instance->Started())
+      ASSERT_TRUE(g_ets_instance->ShutdownAndWaitUntilComplete());
+  }
+
+ private:
+  BlimpContentClient content_client_;
+  std::unique_ptr<BlimpContentBrowserClient> browser_client_;
+};
+
+TEST_F(BlimpUrlRewriterTest, UrlRewriteMatchScheme) {
+  // Check that rewriting the URL with a matching scheme works.
+  content::TestBrowserContext browser_context;
+  content::BrowserURLHandler::GetInstance()->AddHandlerPair(

[shenghuazhang, 2017/01/05 23:36:33]

Failed at GetInstance(). Due to failed to set up ContentClient and the
ContentBrowserClient. 

https://codesearch.chromium.org/chromium/src/content/browser/browser_url_hand...

+      &HandleBlimpTestURL, content::BrowserURLHandler::null_handler());
+
+  GURL url("blimp-test://chrome/test/data/title2.html");
+  GURL original_url(url);
+  bool reverse_on_redirect = false;
+  content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
+      &url, &browser_context, &reverse_on_redirect);
+  ASSERT_NE(original_url, url);
+  ASSERT_TRUE(url.is_valid());
+  ASSERT_TRUE(url.HostIsIPAddress());
+  ASSERT_LT(url::PORT_UNSPECIFIED, url.EffectiveIntPort());
+}
+
+TEST_F(BlimpUrlRewriterTest, UrlRewriteHttpHttpsScheme) {
+  // Check that rewriting the URL with a http/https url works
+  content::TestBrowserContext browser_context;
+  content::BrowserURLHandler::GetInstance()->AddHandlerPair(
+      &HandleBlimpTestURL, content::BrowserURLHandler::null_handler());
+
+  GURL url = GURL("http://www.google.com");
+  GURL original_url = GURL(url);
+  bool reverse_on_redirect = false;
+  content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
+      &url, &browser_context, &reverse_on_redirect);
+  ASSERT_EQ(original_url, url);
+
+  url = GURL("https://www.google.com");
+  original_url = GURL(url);
+  content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
+      &url, &browser_context, &reverse_on_redirect);
+  ASSERT_EQ(original_url, url);
+}
+
+TEST_F(BlimpUrlRewriterTest, UrlRewriteUnmatchScheme) {
+  // Check that rewriting the URL not works with an unmatching url.
+  content::TestBrowserContext browser_context;
+  content::BrowserURLHandler::GetInstance()->AddHandlerPair(
+      &HandleBlimpTestURL, content::BrowserURLHandler::null_handler());
+
+  GURL url = GURL("foo://chrome/test/data/title2.html");
+  GURL original_url = GURL(url);
+  bool reverse_on_redirect = false;
+  content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
+      &url, &browser_context, &reverse_on_redirect);
+  ASSERT_EQ(original_url, url);
+}
+
+}  // namespace test
+
+}  // namespace engine
+}  // namespace blimp