Add some extra unit-tests to make sure we cover all permutations of {basic_au...

net/http/http_auth_handler_basic_unittest.cc

 // Copyright (c) 2006-2008 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 "testing/gtest/include/gtest/gtest.h"
 
 #include "base/basictypes.h"
 #include "net/http/http_auth_handler_basic.h"
 
 namespace net {
 
 TEST(HttpAuthHandlerBasicTest, GenerateCredentials) {
   static const struct {
     const wchar_t* username;
     const wchar_t* password;
     const char* expected_credentials;
   } tests[] = {
     { L"foo", L"bar", "Basic Zm9vOmJhcg==" },
     // Empty password
     { L"anon", L"", "Basic YW5vbjo=" },
+    // Empty username and empty password.
+    { L"", L"", "Basic Og==" },
   };
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
     std::string challenge = "Basic realm=\"Atlantis\"";
     HttpAuthHandlerBasic basic;
     basic.InitFromChallenge(challenge.begin(), challenge.end(),
                             HttpAuth::AUTH_SERVER);
     std::string credentials = basic.GenerateCredentials(tests[i].username,
                                                         tests[i].password,
                                                         NULL, NULL);
     EXPECT_STREQ(tests[i].expected_credentials, credentials.c_str());
   }
 }
 
 } // namespace net