[net/http auth] Make HttpAuthHandler challenge handling asynchronous.

net/http/http_auth_controller_unittest.cc

Index: net/http/http_auth_controller_unittest.cc
diff --git a/net/http/http_auth_controller_unittest.cc b/net/http/http_auth_controller_unittest.cc
index 1235156a38a5bd52b87aa88944aeed666900cb07..e90e578e67b27f22a570b04174512d50bf19e3e5 100644
--- a/net/http/http_auth_controller_unittest.cc
+++ b/net/http/http_auth_controller_unittest.cc
@@ -4,18 +4,30 @@
 
 #include "net/http/http_auth_controller.h"
 
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
+#include "net/dns/mock_host_resolver.h"
+#include "net/http/http_auth.h"
 #include "net/http/http_auth_cache.h"
 #include "net/http/http_auth_challenge_tokenizer.h"
+#include "net/http/http_auth_filter.h"
+#include "net/http/http_auth_handler.h"
+#include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_auth_handler_mock.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_response_headers.h"
+#include "net/http/http_response_info.h"
 #include "net/http/http_util.h"
+#include "net/http/mock_allow_url_security_manager.h"
 #include "net/log/net_log.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using ::testing::ValuesIn;
+
 namespace net {
 
 namespace {
@@ -49,6 +61,10 @@ void RunSingleRoundAuthTest(HandlerRunMode run_mode,
                             int handler_rv,
                             int expected_controller_rv,
                             SchemeState scheme_state) {
+  SCOPED_TRACE(::testing::Message()
+               << "run_mode:" << run_mode << " handler_rv:" << handler_rv
+               << " expected_controller_rv:" << expected_controller_rv
+               << " scheme_state:" << scheme_state);
   BoundNetLog dummy_log;
   HttpAuthCache dummy_auth_cache;
 
@@ -56,10 +72,11 @@ void RunSingleRoundAuthTest(HandlerRunMode run_mode,
   request.method = "GET";
   request.url = GURL("http://example.com");
 
-  scoped_refptr<HttpResponseHeaders> headers(HeadersFromString(
+  HttpResponseInfo response;
+  response.headers = HeadersFromString(
       "HTTP/1.1 407\r\n"
       "Proxy-Authenticate: MOCK foo\r\n"
-      "\r\n"));
+      "\r\n");
 
   HttpAuthHandlerMock::Factory auth_handler_factory;
   scoped_ptr<HttpAuthHandlerMock> auth_handler(new HttpAuthHandlerMock());
@@ -72,20 +89,22 @@ void RunSingleRoundAuthTest(HandlerRunMode run_mode,
       new HttpAuthController(HttpAuth::AUTH_PROXY,
                              GURL("http://example.com"),
                              &dummy_auth_cache, &auth_handler_factory));
-  ASSERT_EQ(OK,
-            controller->HandleAuthChallenge(headers, false, false, dummy_log));
+  TestCompletionCallback completion_callback;
+  int result = controller->HandleAuthChallenge(
+      response, completion_callback.callback(), dummy_log);
+  ASSERT_EQ(OK, completion_callback.GetResult(result));
   ASSERT_TRUE(controller->HaveAuthHandler());
+  EXPECT_FALSE(controller->HaveAuth());
   controller->ResetAuth(
       AuthCredentials(base::ASCIIToUTF16("a"), base::ASCIIToUTF16("b")));
   EXPECT_TRUE(controller->HaveAuth());
 
   TestCompletionCallback callback;
-  EXPECT_EQ((run_mode == RUN_HANDLER_ASYNC)? ERR_IO_PENDING:
-            expected_controller_rv,
-            controller->MaybeGenerateAuthToken(&request, callback.callback(),
-                                               dummy_log));
+  result = controller->MaybeGenerateAuthToken(&request, callback.callback(),
+                                              dummy_log);
   if (run_mode == RUN_HANDLER_ASYNC)
-    EXPECT_EQ(expected_controller_rv, callback.WaitForResult());
+    ASSERT_EQ(ERR_IO_PENDING, result);
+  EXPECT_EQ(expected_controller_rv, callback.GetResult(result));
   EXPECT_EQ((scheme_state == SCHEME_IS_DISABLED),
             controller->IsAuthSchemeDisabled("mock"));
 }
@@ -95,24 +114,30 @@ void RunSingleRoundAuthTest(HandlerRunMode run_mode,
 // If an HttpAuthHandler returns an error code that indicates a
 // permanent error, the HttpAuthController should disable the scheme
 // used and retry the request.
-TEST(HttpAuthControllerTest, PermanentErrors) {
-
-  // Run a synchronous handler that returns
-  // ERR_UNEXPECTED_SECURITY_LIBRARY_STATUS.  We expect a return value
-  // of OK from the controller so we can retry the request.
+TEST(HttpAuthControllerTest, PermanentErrors_Sync) {
   RunSingleRoundAuthTest(RUN_HANDLER_SYNC,
                          ERR_UNEXPECTED_SECURITY_LIBRARY_STATUS,
                          OK, SCHEME_IS_DISABLED);
+}
 
-  // Now try an async handler that returns
-  // ERR_MISSING_AUTH_CREDENTIALS.  Async and sync handlers invoke
-  // different code paths in HttpAuthController when generating
-  // tokens.
+// Similar to the above test. Now try an async handler that returns
+// ERR_MISSING_AUTH_CREDENTIALS. Async and sync handlers invoke different code
+// paths in HttpAuthController when generating tokens.
+TEST(HttpAuthControllerTest, PermanentErrors_Async) {
   RunSingleRoundAuthTest(RUN_HANDLER_ASYNC, ERR_MISSING_AUTH_CREDENTIALS, OK,
                          SCHEME_IS_DISABLED);
+}
 
-  // If a non-permanent error is returned by the handler, then the
-  // controller should report it unchanged.
+// If a non-permanent error is returned by the handler, then the controller
+// should leave the scheme enabled.
+TEST(HttpAuthControllerTest, NonPermanentErrors_Sync) {
+  RunSingleRoundAuthTest(RUN_HANDLER_SYNC, ERR_INVALID_AUTH_CREDENTIALS,
+                         ERR_INVALID_AUTH_CREDENTIALS, SCHEME_IS_ENABLED);
+}
+
+// If a non-permanent error is returned by the handler, then the controller
+// should leave the scheme enabled.
+TEST(HttpAuthControllerTest, NonPermanentErrors_Async) {
   RunSingleRoundAuthTest(RUN_HANDLER_ASYNC, ERR_INVALID_AUTH_CREDENTIALS,
                          ERR_INVALID_AUTH_CREDENTIALS, SCHEME_IS_ENABLED);
 }
@@ -127,11 +152,12 @@ TEST(HttpAuthControllerTest, NoExplicitCredentialsAllowed) {
   request.url = GURL("http://example.com");
 
   HttpRequestHeaders request_headers;
-  scoped_refptr<HttpResponseHeaders> headers(
-      HeadersFromString("HTTP/1.1 401\r\n"
-                        "WWW-Authenticate: Ernie\r\n"
-                        "WWW-Authenticate: Bert\r\n"
-                        "\r\n"));
+  HttpResponseInfo response;
+  response.headers = HeadersFromString(
+      "HTTP/1.1 401\r\n"
+      "WWW-Authenticate: Ernie\r\n"
+      "WWW-Authenticate: Bert\r\n"
+      "\r\n");
 
   HttpAuthHandlerMock::Factory auth_handler_factory;
 
@@ -148,16 +174,17 @@ TEST(HttpAuthControllerTest, NoExplicitCredentialsAllowed) {
       new HttpAuthController(HttpAuth::AUTH_SERVER,
                              GURL("http://example.com"),
                              &dummy_auth_cache, &auth_handler_factory));
-  ASSERT_EQ(OK,
-            controller->HandleAuthChallenge(headers, false, false, dummy_log));
+  TestCompletionCallback completion_calback;
+  int rv = controller->HandleAuthChallenge(
+      response, completion_calback.callback(), dummy_log);
+  ASSERT_EQ(OK, completion_calback.GetResult(rv));
   ASSERT_TRUE(controller->HaveAuthHandler());
-  controller->ResetAuth(AuthCredentials());
   EXPECT_TRUE(controller->HaveAuth());
   EXPECT_FALSE(auth_handler_factory.HaveAuthHandlers());
 
   // Should only succeed if we are using the "Ernie" MockHandler.
-  EXPECT_EQ(OK, controller->MaybeGenerateAuthToken(
-      &request, CompletionCallback(), dummy_log));
+  ASSERT_EQ(OK, controller->MaybeGenerateAuthToken(
+                    &request, completion_calback.callback(), dummy_log));
   controller->AddAuthorizationHeader(&request_headers);
 
   // Handlers for the second attempt. Neither should be used to generate a
@@ -182,9 +209,12 @@ TEST(HttpAuthControllerTest, NoExplicitCredentialsAllowed) {
 
   // Once a token is generated, simulate the receipt of a server response
   // indicating that the authentication attempt was rejected.
-  ASSERT_EQ(OK,
-            controller->HandleAuthChallenge(headers, false, false, dummy_log));
+  TestCompletionCallback completion_calback_rejected;
+  rv = controller->HandleAuthChallenge(
+      response, completion_calback_rejected.callback(), dummy_log);
+  ASSERT_EQ(OK, completion_calback_rejected.GetResult(rv));
   ASSERT_TRUE(controller->HaveAuthHandler());
+  EXPECT_FALSE(controller->HaveAuth());
   controller->ResetAuth(AuthCredentials(base::ASCIIToUTF16("Hello"),
                         base::string16()));
   EXPECT_TRUE(controller->HaveAuth());
@@ -193,7 +223,445 @@ TEST(HttpAuthControllerTest, NoExplicitCredentialsAllowed) {
 
   // Should only succeed if we are using the "Bert" MockHandler.
   EXPECT_EQ(OK, controller->MaybeGenerateAuthToken(
-      &request, CompletionCallback(), dummy_log));
+                    &request, completion_calback.callback(), dummy_log));
 }
 
+namespace {
+
+struct ChallengeResponse {
+  const char* const response_headers = nullptr;
+  const char* const authorization_header = nullptr;
+
+  ChallengeResponse(const char* const response_headers,
+                    const char* const authorization_header)
+      : response_headers(response_headers),
+        authorization_header(authorization_header) {}
+};
+
+struct MockAuthHandler {
+  std::string scheme;
+  int init_rv = OK;
+  int generate_rv = OK;
+
+  MockAuthHandler(const std::string& scheme, int int_rv, int generate_rv)
+      : scheme(scheme), init_rv(int_rv), generate_rv(generate_rv) {}
+};
+
+struct ChallengeResponseTestCase {
+  std::vector<ChallengeResponse> rounds;
+  std::vector<MockAuthHandler> handlers;
+  bool run_handler_async = false;
+
+  ChallengeResponseTestCase& WithChallengeResponse(
+      const char* response_headers,
+      const char* authorization_header) {
+    rounds.push_back(ChallengeResponse(response_headers, authorization_header));
+    return *this;
+  }
+
+  ChallengeResponseTestCase& WithHandler(const base::StringPiece& scheme,
+                                         int init_rv,
+                                         int generate_rv) {
+    handlers.push_back(
+        MockAuthHandler(scheme.as_string(), init_rv, generate_rv));
+    return *this;
+  }
+};
+
+std::vector<ChallengeResponseTestCase> SyncAndAsync(
+    const ChallengeResponseTestCase& test_case) {
+  std::vector<ChallengeResponseTestCase> test_cases;
+  ChallengeResponseTestCase test_case_copy = test_case;
+
+  test_case_copy.run_handler_async = false;
+  test_cases.push_back(test_case_copy);
+
+  test_case_copy.run_handler_async = true;
+  test_cases.push_back(test_case_copy);
+  return test_cases;
+}
+
+class HttpAuthControllerTest
+    : public ::testing::TestWithParam<ChallengeResponseTestCase> {};
+
+}  // namespace
+
+TEST_P(HttpAuthControllerTest, Run) {
+  const ChallengeResponseTestCase& params = GetParam();
+  BoundNetLog dummy_log;
+  HttpAuthCache dummy_auth_cache;
+  GURL url("http://example.com");
+  HttpAuthHandlerMock::Factory auth_factory;
+
+  for (const auto& handler : params.handlers) {
+    scoped_ptr<HttpAuthHandlerMock> mock_handler(new HttpAuthHandlerMock);
+    mock_handler->set_expected_auth_scheme(handler.scheme);
+    mock_handler->set_expect_multiple_challenges(handler.scheme == "ntlm" ||
+                                                 handler.scheme == "negotiate");
+    mock_handler->SetInitExpectation(params.run_handler_async, handler.init_rv);
+    mock_handler->SetGenerateExpectation(params.run_handler_async,
+                                         handler.generate_rv);
+    auth_factory.AddMockHandler(mock_handler.Pass(),
+                                HttpAuthHandlerCreateReason::CHALLENGE);
+  }
+
+  HttpRequestInfo request_info;
+
+  scoped_refptr<HttpAuthController> auth_controller(new HttpAuthController(
+      HttpAuth::AUTH_SERVER, url, &dummy_auth_cache, &auth_factory));
+  for (const auto& round : params.rounds) {
+    if (!round.response_headers)
+      break;
+    HttpResponseInfo response_info;
+    response_info.headers = HeadersFromString(round.response_headers);
+    TestCompletionCallback callback;
+
+    int result = auth_controller->HandleAuthChallenge(
+        response_info, callback.callback(), dummy_log);
+    EXPECT_EQ(OK, callback.GetResult(result));
+
+    if (!auth_controller->HaveAuthHandler()) {
+      EXPECT_STREQ("", round.authorization_header);
+      continue;
+    }
+
+    if (!auth_controller->HaveAuth()) {
+      auth_controller->ResetAuth(
+          AuthCredentials(base::ASCIIToUTF16("a"), base::ASCIIToUTF16("b")));
+    }
+
+    result = auth_controller->MaybeGenerateAuthToken(
+        &request_info, callback.callback(), dummy_log);
+    EXPECT_EQ(OK, callback.GetResult(result));
+    HttpRequestHeaders headers;
+    auth_controller->AddAuthorizationHeader(&headers);
+    std::string authorization_header;
+    headers.GetHeader(
+        HttpAuth::GetAuthorizationHeaderName(HttpAuth::AUTH_SERVER),
+        &authorization_header);
+    EXPECT_STREQ(round.authorization_header, authorization_header.c_str());
+  }
+
+  EXPECT_FALSE(auth_factory.HaveAuthHandlers());
+}
+
+// Picks Basic because that's the only supported scheme.
+INSTANTIATE_TEST_CASE_P(
+    PickSupportedScheme,
+    HttpAuthControllerTest,
+    ValuesIn(
+        SyncAndAsync(ChallengeResponseTestCase()
+                         .WithChallengeResponse(
+                             "HTTP/1.1 401\n"
+                             "Y: Digest realm=\"X\", nonce=\"aaaaaaaaaa\"\n"
+                             "www-authenticate: Basic realm=\"BasicRealm\"\n",
+                             "basic auth_token,realm=\"BasicRealm\"")
+                         .WithHandler("basic", OK, OK))));
+
+// No supported schemes.
+INSTANTIATE_TEST_CASE_P(
+    NoSupportedSchemes,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(ChallengeResponseTestCase().WithChallengeResponse(
+        "HTTP/1.1 401\n"
+        "Y: Digest realm=\"FooBar\", nonce=\"aaaaaaaaaa\"\n"
+        "www-authenticate: Fake realm=\"FooBar\"\n",
+        ""))));
+
+// Pick Digest over Basic.
+INSTANTIATE_TEST_CASE_P(
+    DigestOverBasic,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse(
+                "HTTP/1.1 401\n"
+                "www-authenticate: Basic realm=\"FooBar\"\n"
+                "www-authenticate: Fake realm=\"FooBar\"\n"
+                "www-authenticate: nonce=\"aaaaaaaaaa\"\n"
+                "www-authenticate: Digest realm=\"DigestRealm\", "
+                "nonce=\"aaaaaaaaaa\"\n",
+                "digest auth_token,realm=\"DigestRealm\", nonce=\"aaaaaaaaaa\"")
+            .WithHandler("digest", OK, OK))));
+
+// Handle an empty header correctly.
+INSTANTIATE_TEST_CASE_P(
+    EmptyHeader,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(ChallengeResponseTestCase().WithChallengeResponse(
+        "HTTP/1.1 401\n"
+        "Y: Digest realm=\"X\", nonce=\"aaaaaaaaaa\"\n"
+        "www-authenticate:\n",
+        ""))));
+
+// NTLM appears earlier in the list, Negotiate is preferred.
+INSTANTIATE_TEST_CASE_P(
+    NegotiateOverNTLM,
+    HttpAuthControllerTest,
+    ValuesIn(
+        SyncAndAsync(ChallengeResponseTestCase()
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: NTLM\n"
+                                                "WWW-Authenticate: Negotiate\n",
+                                                "negotiate auth_token")
+                         .WithHandler("negotiate", OK, OK))));
+
+// Two rounds. Basic isn't connection oriented and will use up a new handler
+// for the second challenge.
+INSTANTIATE_TEST_CASE_P(
+    SecondChallengeForBasic,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic first_round\n",
+                                   "basic auth_token,first_round")
+            .WithHandler("basic", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic second_round\n",
+                                   "basic auth_token,second_round")
+            .WithHandler("basic", OK, OK))));
+
+// Correctly deal with a missing challenge for the second round.
+INSTANTIATE_TEST_CASE_P(
+    SecondChallengeIsMissing,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic first_round\n",
+                                   "basic auth_token,first_round")
+            .WithHandler("basic", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n", ""))));
+
+// Correctly deal with an empty challenge for the second round.
+INSTANTIATE_TEST_CASE_P(
+    SecondChallengeIsEmpty,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic first_round\n",
+                                   "basic auth_token,first_round")
+            .WithHandler("basic", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate:\n",
+                                   ""))));
+
+// The second round introduces a preferred scheme.
+INSTANTIATE_TEST_CASE_P(
+    SecondChallengeHasPreferredScheme,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic first_round\n",
+                                   "basic auth_token,first_round")
+            .WithHandler("basic", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic second_round\n"
+                                   "WWW-Authenticate: Negotiate\n",
+                                   "negotiate auth_token")
+            .WithHandler("negotiate", OK, OK))));
+
+// If there are two challenges, then the auth controller should pick the first
+// one.
+INSTANTIATE_TEST_CASE_P(
+    MultipleChallengesForSameScheme,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic first_round\n",
+                                   "basic auth_token,first_round")
+            .WithHandler("basic", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic second_round_1\n"
+                                   "WWW-Authenticate: Basic second_round_2\n",
+                                   "basic auth_token,second_round_1")
+            .WithHandler("basic", OK, OK))));
+
+// As above, but the handler will reject the first challenge of the second
+// round. The auth controller should use the second challenge instead.
+INSTANTIATE_TEST_CASE_P(
+    RejectChallengeForTheSameSchemeInSingleResponse,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic first_round\n",
+                                   "basic auth_token,first_round")
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic second_round_1\n"
+                                   "WWW-Authenticate: Basic second_round_2\n",
+                                   "basic auth_token,second_round_2")
+            .WithHandler("basic", OK, OK)
+            .WithHandler("basic", ERR_INVALID_AUTH_CREDENTIALS, OK)
+            .WithHandler("basic", OK, OK))));
+
+// Connection based schemes will treat new auth challenges for the same scheme
+// as acceptance and continuance of the current handshake if there's a
+// parameter.
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_Continuations,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Negotiate\n",
+                                   "negotiate auth_token")
+            .WithHandler("negotiate", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Negotiate foo\n",
+                                   "negotiate continuation,foo"))));
+
+// As above, but picks the first challenge for the second round.
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_ContinuationsWithMultipleChallenges,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Negotiate\n",
+                                   "negotiate auth_token")
+            .WithHandler("negotiate", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Negotiate foo\n"
+                                   "WWW-Authenticate: Negotiate\n",
+                                   "negotiate continuation,foo"))));
+
+// As above. The first challenge in the second round counts as a rejection, so
+// the controller should create a new handler and restart the handshake.
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_ContinuationsWithMultipleChallengesAndRejection,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Negotiate\n",
+                                   "negotiate auth_token")
+            .WithHandler("negotiate", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Negotiate\n"
+                                   "WWW-Authenticate: Negotiate continuation\n",
+                                   "negotiate auth_token")
+            .WithHandler("negotiate", OK, OK))));
+
+// Multiround authentication with rejection. The rejection comes in the form of
+// an empty challenge for the same scheme.
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_RejectionViaEmptyChallenge,
+    HttpAuthControllerTest,
+    ValuesIn(
+        SyncAndAsync(ChallengeResponseTestCase()
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: Negotiate\n",
+                                                "negotiate auth_token")
+                         .WithHandler("negotiate", OK, OK)
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: Negotiate\n",
+                                                "negotiate auth_token")
+                         .WithHandler("negotiate", OK, OK)
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: Negotiate\n",
+                                                "negotiate auth_token")
+                         .WithHandler("negotiate", OK, OK))));
+
+// Multiround authentication with rejection. The rejection comes in the form of
+// a response with no challenge for the original scheme.
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_RejectionViaSchemeChange,
+    HttpAuthControllerTest,
+    ValuesIn(
+        SyncAndAsync(ChallengeResponseTestCase()
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: Negotiate\n",
+                                                "negotiate auth_token")
+                         .WithHandler("negotiate", OK, OK)
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: Basic foo\n",
+                                                "basic auth_token,foo")
+                         .WithHandler("basic", OK, OK))));
+
+// Dealing with empty and missing second round challenges for connection
+// oriented schemes.
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_EmptySecondChallenge,
+    HttpAuthControllerTest,
+    ValuesIn(
+        SyncAndAsync(ChallengeResponseTestCase()
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: Negotiate\n",
+                                                "negotiate auth_token")
+                         .WithHandler("negotiate", OK, OK)
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate:\n",
+                                                ""))));
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_MissingSecondChallenge,
+    HttpAuthControllerTest,
+    ValuesIn(
+        SyncAndAsync(ChallengeResponseTestCase()
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: Negotiate\n",
+                                                "negotiate auth_token")
+                         .WithHandler("negotiate", OK, OK)
+                         .WithChallengeResponse("HTTP/1.1 401\n", ""))));
+
+// Should pick matching challenge even if other challenges are present.
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_PicksCorrectChallenge,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Negotiate\n",
+                                   "negotiate auth_token")
+            .WithHandler("negotiate", OK, OK)
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic foo\n"
+                                   "WWW-Authenticate: Negotiate bar\n",
+                                   "negotiate continuation,bar"))));
+INSTANTIATE_TEST_CASE_P(
+    MultiRoundAuth_PicksCorrectChallengeWithPreferredChallenge,
+    HttpAuthControllerTest,
+    ValuesIn(
+        SyncAndAsync(ChallengeResponseTestCase()
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: NTLM\n",
+                                                "ntlm auth_token")
+                         .WithHandler("ntlm", OK, OK)
+                         .WithChallengeResponse("HTTP/1.1 401\n"
+                                                "WWW-Authenticate: Negotiate\n"
+                                                "WWW-Authenticate: NTLM bar\n",
+                                                "ntlm continuation,bar"))));
+
+// If an auth handler fails to initialize, the controller should try the next
+// suitable challenge.
+INSTANTIATE_TEST_CASE_P(
+    FallThroughInvalidHeaders,
+    HttpAuthControllerTest,
+    ValuesIn(SyncAndAsync(
+        ChallengeResponseTestCase()
+            .WithChallengeResponse("HTTP/1.1 401\n"
+                                   "WWW-Authenticate: Basic abc;\n"
+                                   "WWW-Authenticate: Digest abc;\n"
+                                   "WWW-Authenticate: Basic valid",
+                                   "basic auth_token,valid")
+            // The first challenge chosen is Digest. But the handler fails.
+            .WithHandler("digest", ERR_INVALID_AUTH_CREDENTIALS, OK)
+            // Next the controller tries the first Basic challenge, which also
+            // fails.
+            .WithHandler("basic", ERR_INVALID_AUTH_CREDENTIALS, OK)
+            // Finally, the second Basic challenge succeeds.
+            .WithHandler("basic", OK, OK))));
+
+// Identities are used in the correct order.
+TEST(HttpAuthControllerTest, IdentityPriorityOrder) {}
+
+// Identities from abstract sources should be available to a new handler if the
+// server changes authentication scheme or if all identity sources were
+// exhausted for a handler.
+TEST(HttpAuthControllerTest, IdentityReuseAcrossHandlers) {}
+
 }  // namespace net