Will now DCHECK that test writers start the embedded server before using it.

net/test/embedded_test_server/embedded_test_server.cc

 // Copyright (c) 2012 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 "net/test/embedded_test_server/embedded_test_server.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 178 matching lines @@
         not_found_response.PassAs<HttpResponse>());
   }
 
   // Drop the connection, since we do not support multiple requests per
   // connection.
   connections_.erase(connection->socket_.get());
   delete connection;
 }
 
 GURL EmbeddedTestServer::GetURL(const std::string& relative_url) const {
+  DCHECK(Started()) << "You must start the server first.";
   DCHECK(StartsWithASCII(relative_url, "/", true /* case_sensitive */))
       << relative_url;
   return base_url_.Resolve(relative_url);
 }
 
 void EmbeddedTestServer::ServeFilesFromDirectory(
     const base::FilePath& directory) {
   RegisterRequestHandler(base::Bind(&HandleFileRequest, directory));
 }
 
@@ skipping 69 matching lines @@
   base::RunLoop run_loop;
   if (!io_thread_->PostTaskAndReply(FROM_HERE, closure, run_loop.QuitClosure()))
     return false;
   run_loop.Run();
 
   return true;
 }
 
 }  // namespace test_server
 }  // namespace net