Setup initial mock url request job tests for Cronet

components/cronet/android/test/cronet_mock_job_interceptor.cc

Index: components/cronet/android/test/cronet_mock_job_interceptor.cc
diff --git a/components/cronet/android/test/cronet_mock_job_interceptor.cc b/components/cronet/android/test/cronet_mock_job_interceptor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fac8bf2486a18001403fe5b3b3b1b77979d8aefd
--- /dev/null
+++ b/components/cronet/android/test/cronet_mock_job_interceptor.cc
@@ -0,0 +1,80 @@
+// Copyright (c) 2014 The Chromium Authors. All rights reserved.

[mmenke, 2014/09/19 17:15:55]

nit:  Don't use (c) in new files.

[xunjieli, 2014/09/19 20:39:15]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cronet_mock_job_interceptor.h"
+
+#include "base/files/file_path.h"
+#include "base/macros.h"
+#include "base/message_loop/message_loop.h"
+#include "base/path_service.h"
+#include "net/base/net_errors.h"
+#include "net/test/url_request/url_request_failed_job.h"
+#include "net/test/url_request/url_request_mock_http_job.h"
+#include "net/url_request/url_request_filter.h"
+#include "net/url_request/url_request_interceptor.h"
+
+namespace cronet {
+
+namespace {
+
+// A mock URL that will produces a redirect.
+const char kMockCronetTestRedirectUrl[] = "http://mock.cronet.redirect/";
+
+// A mock URL that will return a 404 response.
+const char kMockCronetTestSuccessUrl[] = "http://mock.cronet.success/";
+
+// A mock URL that will result in a failed url request.
+const char kMockCronetTestFailedUrl[] = "http://mock.cronet.failed/";
+
+class CronetMockJobInterceptor : public net::URLRequestInterceptor {
+ public:
+  CronetMockJobInterceptor() {}
+  virtual ~CronetMockJobInterceptor() {}
+
+  // net::URLRequestInterceptor implementation
+  virtual net::URLRequestJob* MaybeInterceptRequest(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate) const OVERRIDE {
+    base::FilePath test_files_root;
+    PathService::Get(base::DIR_ANDROID_APP_DATA, &test_files_root);
+    if (request->url() == GURL(kMockCronetTestRedirectUrl)) {
+      return new net::URLRequestMockHTTPJob(
+          request,
+          network_delegate,
+          test_files_root.Append("redirect.html"),
+          base::MessageLoop::current()->message_loop_proxy());
+    }
+    if (request->url() == GURL(kMockCronetTestSuccessUrl)) {
+      return new net::URLRequestMockHTTPJob(
+          request,
+          network_delegate,
+          test_files_root.Append("success.html"),
+          base::MessageLoop::current()->message_loop_proxy());
+    }
+    return new net::URLRequestFailedJob(
+        request, network_delegate, net::ERR_FAILED);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CronetMockJobInterceptor);
+};
+
+}  // namespace
+
+// static
+bool AddUrlInterceptors() {
+  net::URLRequestFilter* filter = net::URLRequestFilter::GetInstance();
+  // TODO(xunjieli): use a map to avoid code duplication.
+  return filter->AddUrlInterceptor(GURL(kMockCronetTestSuccessUrl),
+                                   scoped_ptr<net::URLRequestInterceptor>(
+                                       new CronetMockJobInterceptor())) &&
+         filter->AddUrlInterceptor(GURL(kMockCronetTestRedirectUrl),
+                                   scoped_ptr<net::URLRequestInterceptor>(
+                                       new CronetMockJobInterceptor())) &&

[mmenke, 2014/09/19 17:15:55]

As Misha said, we really shouldn't be listing these individually.  We can just
use net::URLRequestMockHTTPJob::AddUrlHandler(test_files_root,
base::MessageLoop::current()->message_loop_proxy());

And then access the files in tests via "http://mock.http/redirect.html",
"http://mock.http/success.html", etc.

Could optionally use net::URLRequestFailedJob::AddUrlHandler() as well, and just
use "http://mock.failed.request/2" for ERR_FAILED.  (The numeric value for
ERR_FAILED is -2)

I probably should have suggested these last time.

[xunjieli, 2014/09/19 20:39:15]

Done. I see! That's very smart! But I am having one problem with passing in the
test_files_root. see my other comment on the new patch set.

+         filter->AddUrlInterceptor(GURL(kMockCronetTestFailedUrl),
+                                   scoped_ptr<net::URLRequestInterceptor>(
+                                       new CronetMockJobInterceptor()));
+}
+
+}  // namespace cronet