net/proxy/dhcp_proxy_script_fetcher_win_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/proxy/dhcp_proxy_script_fetcher_win.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/bind_helpers.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/rand_util.h"
  13 #include "base/test/test_timeouts.h"
  14 #include "base/threading/platform_thread.h"
  15 #include "base/timer/elapsed_timer.h"
  16 #include "net/base/completion_callback.h"
  17 #include "net/proxy/dhcp_proxy_script_adapter_fetcher_win.h"
  18 #include "net/url_request/url_request_test_util.h"
  19 #include "testing/gtest/include/gtest/gtest.h"
  20
  21 namespace net {
  22
  23 namespace {
  24
  25 TEST(DhcpProxyScriptFetcherWin, AdapterNamesAndPacURLFromDhcp) {
  26   // This tests our core Win32 implementation without any of the wrappers
  27   // we layer on top to achieve asynchronous and parallel operations.
  28   //
  29   // We don't make assumptions about the environment this unit test is
  30   // running in, so it just exercises the code to make sure there
  31   // is no crash and no error returned, but does not assert on the number
  32   // of interfaces or the information returned via DHCP.
  33   std::set<std::string> adapter_names;
  34   DhcpProxyScriptFetcherWin::GetCandidateAdapterNames(&adapter_names);
  35   for (std::set<std::string>::const_iterator it = adapter_names.begin();
  36        it != adapter_names.end();
  37        ++it) {
  38     const std::string& adapter_name = *it;
  39     DhcpProxyScriptAdapterFetcher::GetPacURLFromDhcp(adapter_name);
  40   }
  41 }
  42
  43 // Helper for RealFetch* tests below.
  44 class RealFetchTester {
  45  public:
  46   RealFetchTester()
  47       : context_(new TestURLRequestContext),
  48         fetcher_(new DhcpProxyScriptFetcherWin(context_.get())),
  49         finished_(false),
  50         on_completion_is_error_(false) {
  51     // Make sure the test ends.
  52     timeout_.Start(FROM_HERE,
  53         base::TimeDelta::FromSeconds(5), this, &RealFetchTester::OnTimeout);
  54   }
  55
  56   void RunTest() {
  57     int result = fetcher_->Fetch(
  58         &pac_text_,
  59         base::Bind(&RealFetchTester::OnCompletion, base::Unretained(this)));
  60     if (result != ERR_IO_PENDING)
  61       finished_ = true;
  62   }
  63
  64   void RunTestWithCancel() {
  65     RunTest();
  66     fetcher_->Cancel();
  67   }
  68
  69   void RunTestWithDeferredCancel() {
  70     // Put the cancellation into the queue before even running the
  71     // test to avoid the chance of one of the adapter fetcher worker
  72     // threads completing before cancellation.  See http://crbug.com/86756.
  73     cancel_timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(0),
  74                         this, &RealFetchTester::OnCancelTimer);
  75     RunTest();
  76   }
  77
  78   void OnCompletion(int result) {
  79     if (on_completion_is_error_) {
  80       FAIL() << "Received completion for test in which this is error.";
  81     }
  82     finished_ = true;
  83   }
  84
  85   void OnTimeout() {
  86     OnCompletion(0);
  87   }
  88
  89   void OnCancelTimer() {
  90     fetcher_->Cancel();
  91     finished_ = true;
  92   }
  93
  94   void WaitUntilDone() {
  95     while (!finished_) {
  96       base::MessageLoop::current()->RunUntilIdle();
  97     }
  98     base::MessageLoop::current()->RunUntilIdle();
  99   }
 100
 101   // Attempts to give worker threads time to finish.  This is currently
 102   // very simplistic as completion (via completion callback or cancellation)
 103   // immediately "detaches" any worker threads, so the best we can do is give
 104   // them a little time.  If we start running into Valgrind leaks, we can
 105   // do something a bit more clever to track worker threads even when the
 106   // DhcpProxyScriptFetcherWin state machine has finished.
 107   void FinishTestAllowCleanup() {
 108     base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(30));
 109   }
 110
 111   scoped_ptr<URLRequestContext> context_;
 112   scoped_ptr<DhcpProxyScriptFetcherWin> fetcher_;
 113   bool finished_;
 114   base::string16 pac_text_;
 115   base::OneShotTimer<RealFetchTester> timeout_;
 116   base::OneShotTimer<RealFetchTester> cancel_timer_;
 117   bool on_completion_is_error_;
 118 };
 119
 120 TEST(DhcpProxyScriptFetcherWin, RealFetch) {
 121   // This tests a call to Fetch() with no stubbing out of dependencies.
 122   //
 123   // We don't make assumptions about the environment this unit test is
 124   // running in, so it just exercises the code to make sure there
 125   // is no crash and no unexpected error returned, but does not assert on
 126   // results beyond that.
 127   RealFetchTester fetcher;
 128   fetcher.RunTest();
 129
 130   fetcher.WaitUntilDone();
 131   fetcher.fetcher_->GetPacURL().possibly_invalid_spec();
 132
 133   fetcher.FinishTestAllowCleanup();
 134 }
 135
 136 TEST(DhcpProxyScriptFetcherWin, RealFetchWithCancel) {
 137   // Does a Fetch() with an immediate cancel.  As before, just
 138   // exercises the code without stubbing out dependencies.
 139   RealFetchTester fetcher;
 140   fetcher.RunTestWithCancel();
 141   base::MessageLoop::current()->RunUntilIdle();
 142
 143   // Attempt to avoid Valgrind leak reports in case worker thread is
 144   // still running.
 145   fetcher.FinishTestAllowCleanup();
 146 }
 147
 148 // For RealFetchWithDeferredCancel, below.
 149 class DelayingDhcpProxyScriptAdapterFetcher
 150     : public DhcpProxyScriptAdapterFetcher {
 151  public:
 152   DelayingDhcpProxyScriptAdapterFetcher(
 153       URLRequestContext* url_request_context,
 154       scoped_refptr<base::TaskRunner> task_runner)
 155       : DhcpProxyScriptAdapterFetcher(url_request_context, task_runner) {
 156   }
 157
 158   class DelayingDhcpQuery : public DhcpQuery {
 159    public:
 160     explicit DelayingDhcpQuery()
 161         : DhcpQuery() {
 162     }
 163
 164     std::string ImplGetPacURLFromDhcp(
 165         const std::string& adapter_name) override {
 166       base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(20));
 167       return DhcpQuery::ImplGetPacURLFromDhcp(adapter_name);
 168     }
 169   };
 170
 171   DhcpQuery* ImplCreateDhcpQuery() override {
 172     return new DelayingDhcpQuery();
 173   }
 174 };
 175
 176 // For RealFetchWithDeferredCancel, below.
 177 class DelayingDhcpProxyScriptFetcherWin
 178     : public DhcpProxyScriptFetcherWin {
 179  public:
 180   explicit DelayingDhcpProxyScriptFetcherWin(
 181       URLRequestContext* context)
 182       : DhcpProxyScriptFetcherWin(context) {
 183   }
 184
 185   DhcpProxyScriptAdapterFetcher* ImplCreateAdapterFetcher() override {
 186     return new DelayingDhcpProxyScriptAdapterFetcher(url_request_context(),
 187                                                      GetTaskRunner());
 188   }
 189 };
 190
 191 TEST(DhcpProxyScriptFetcherWin, RealFetchWithDeferredCancel) {
 192   // Does a Fetch() with a slightly delayed cancel.  As before, just
 193   // exercises the code without stubbing out dependencies, but
 194   // introduces a guaranteed 20 ms delay on the worker threads so that
 195   // the cancel is called before they complete.
 196   RealFetchTester fetcher;
 197   fetcher.fetcher_.reset(
 198       new DelayingDhcpProxyScriptFetcherWin(fetcher.context_.get()));
 199   fetcher.on_completion_is_error_ = true;
 200   fetcher.RunTestWithDeferredCancel();
 201   fetcher.WaitUntilDone();
 202 }
 203
 204 // The remaining tests are to exercise our state machine in various
 205 // situations, with actual network access fully stubbed out.
 206
 207 class DummyDhcpProxyScriptAdapterFetcher
 208     : public DhcpProxyScriptAdapterFetcher {
 209  public:
 210   DummyDhcpProxyScriptAdapterFetcher(URLRequestContext* context,
 211                                      scoped_refptr<base::TaskRunner> runner)
 212       : DhcpProxyScriptAdapterFetcher(context, runner),
 213         did_finish_(false),
 214         result_(OK),
 215         pac_script_(L"bingo"),
 216         fetch_delay_ms_(1) {
 217   }
 218
 219   void Fetch(const std::string& adapter_name,
 220              const CompletionCallback& callback) override {
 221     callback_ = callback;
 222     timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(fetch_delay_ms_),
 223                  this, &DummyDhcpProxyScriptAdapterFetcher::OnTimer);
 224   }
 225
 226   void Cancel() override {
 227     timer_.Stop();
 228   }
 229
 230   bool DidFinish() const override {
 231     return did_finish_;
 232   }
 233
 234   int GetResult() const override {
 235     return result_;
 236   }
 237
 238   base::string16 GetPacScript() const override {
 239     return pac_script_;
 240   }
 241
 242   void OnTimer() {
 243     callback_.Run(result_);
 244   }
 245
 246   void Configure(bool did_finish,
 247                  int result,
 248                  base::string16 pac_script,
 249                  int fetch_delay_ms) {
 250     did_finish_ = did_finish;
 251     result_ = result;
 252     pac_script_ = pac_script;
 253     fetch_delay_ms_ = fetch_delay_ms;
 254   }
 255
 256  private:
 257   bool did_finish_;
 258   int result_;
 259   base::string16 pac_script_;
 260   int fetch_delay_ms_;
 261   CompletionCallback callback_;
 262   base::OneShotTimer<DummyDhcpProxyScriptAdapterFetcher> timer_;
 263 };
 264
 265 class MockDhcpProxyScriptFetcherWin : public DhcpProxyScriptFetcherWin {
 266  public:
 267   class MockAdapterQuery : public AdapterQuery {
 268    public:
 269     MockAdapterQuery() {
 270     }
 271
 272     virtual ~MockAdapterQuery() {
 273     }
 274
 275     virtual bool ImplGetCandidateAdapterNames(
 276         std::set<std::string>* adapter_names) override {
 277       adapter_names->insert(
 278           mock_adapter_names_.begin(), mock_adapter_names_.end());
 279       return true;
 280     }
 281
 282     std::vector<std::string> mock_adapter_names_;
 283   };
 284
 285   MockDhcpProxyScriptFetcherWin(URLRequestContext* context)
 286       : DhcpProxyScriptFetcherWin(context),
 287         num_fetchers_created_(0),
 288         worker_finished_event_(true, false) {
 289     ResetTestState();
 290   }
 291
 292   virtual ~MockDhcpProxyScriptFetcherWin() {
 293     ResetTestState();
 294   }
 295
 296   using DhcpProxyScriptFetcherWin::GetTaskRunner;
 297
 298   // Adds a fetcher object to the queue of fetchers used by
 299   // |ImplCreateAdapterFetcher()|, and its name to the list of adapters
 300   // returned by ImplGetCandidateAdapterNames.
 301   void PushBackAdapter(const std::string& adapter_name,
 302                        DhcpProxyScriptAdapterFetcher* fetcher) {
 303     adapter_query_->mock_adapter_names_.push_back(adapter_name);
 304     adapter_fetchers_.push_back(fetcher);
 305   }
 306
 307   void ConfigureAndPushBackAdapter(const std::string& adapter_name,
 308                                    bool did_finish,
 309                                    int result,
 310                                    base::string16 pac_script,
 311                                    base::TimeDelta fetch_delay) {
 312     scoped_ptr<DummyDhcpProxyScriptAdapterFetcher> adapter_fetcher(
 313         new DummyDhcpProxyScriptAdapterFetcher(url_request_context(),
 314                                                GetTaskRunner()));
 315     adapter_fetcher->Configure(
 316         did_finish, result, pac_script, fetch_delay.InMilliseconds());
 317     PushBackAdapter(adapter_name, adapter_fetcher.release());
 318   }
 319
 320   DhcpProxyScriptAdapterFetcher* ImplCreateAdapterFetcher() override {
 321     ++num_fetchers_created_;
 322     return adapter_fetchers_[next_adapter_fetcher_index_++];
 323   }
 324
 325   virtual AdapterQuery* ImplCreateAdapterQuery() override {
 326     DCHECK(adapter_query_.get());
 327     return adapter_query_.get();
 328   }
 329
 330   base::TimeDelta ImplGetMaxWait() override {
 331     return max_wait_;
 332   }
 333
 334   void ImplOnGetCandidateAdapterNamesDone() override {
 335     worker_finished_event_.Signal();
 336   }
 337
 338   void ResetTestState() {
 339     // Delete any adapter fetcher objects we didn't hand out.
 340     std::vector<DhcpProxyScriptAdapterFetcher*>::const_iterator it
 341         = adapter_fetchers_.begin();
 342     for (; it != adapter_fetchers_.end(); ++it) {
 343       if (num_fetchers_created_-- <= 0) {
 344         delete (*it);
 345       }
 346     }
 347
 348     next_adapter_fetcher_index_ = 0;
 349     num_fetchers_created_ = 0;
 350     adapter_fetchers_.clear();
 351     adapter_query_ = new MockAdapterQuery();
 352     max_wait_ = TestTimeouts::tiny_timeout();
 353   }
 354
 355   bool HasPendingFetchers() {
 356     return num_pending_fetchers() > 0;
 357   }
 358
 359   int next_adapter_fetcher_index_;
 360
 361   // Ownership gets transferred to the implementation class via
 362   // ImplCreateAdapterFetcher, but any objects not handed out are
 363   // deleted on destruction.
 364   std::vector<DhcpProxyScriptAdapterFetcher*> adapter_fetchers_;
 365
 366   scoped_refptr<MockAdapterQuery> adapter_query_;
 367
 368   base::TimeDelta max_wait_;
 369   int num_fetchers_created_;
 370   base::WaitableEvent worker_finished_event_;
 371 };
 372
 373 class FetcherClient {
 374  public:
 375   FetcherClient()
 376       : context_(new TestURLRequestContext),
 377         fetcher_(context_.get()),
 378         finished_(false),
 379         result_(ERR_UNEXPECTED) {
 380   }
 381
 382   void RunTest() {
 383     int result = fetcher_.Fetch(
 384         &pac_text_,
 385         base::Bind(&FetcherClient::OnCompletion, base::Unretained(this)));
 386     ASSERT_EQ(ERR_IO_PENDING, result);
 387   }
 388
 389   void RunMessageLoopUntilComplete() {
 390     while (!finished_) {
 391       base::MessageLoop::current()->RunUntilIdle();
 392     }
 393     base::MessageLoop::current()->RunUntilIdle();
 394   }
 395
 396   void RunMessageLoopUntilWorkerDone() {
 397     DCHECK(fetcher_.adapter_query_.get());
 398     while (!fetcher_.worker_finished_event_.TimedWait(
 399         base::TimeDelta::FromMilliseconds(10))) {
 400       base::MessageLoop::current()->RunUntilIdle();
 401     }
 402   }
 403
 404   void OnCompletion(int result) {
 405     finished_ = true;
 406     result_ = result;
 407   }
 408
 409   void ResetTestState() {
 410     finished_ = false;
 411     result_ = ERR_UNEXPECTED;
 412     pac_text_ = L"";
 413     fetcher_.ResetTestState();
 414   }
 415
 416   scoped_refptr<base::TaskRunner> GetTaskRunner() {
 417     return fetcher_.GetTaskRunner();
 418   }
 419
 420   scoped_ptr<URLRequestContext> context_;
 421   MockDhcpProxyScriptFetcherWin fetcher_;
 422   bool finished_;
 423   int result_;
 424   base::string16 pac_text_;
 425 };
 426
 427 // We separate out each test's logic so that we can easily implement
 428 // the ReuseFetcher test at the bottom.
 429 void TestNormalCaseURLConfiguredOneAdapter(FetcherClient* client) {
 430   TestURLRequestContext context;
 431   scoped_ptr<DummyDhcpProxyScriptAdapterFetcher> adapter_fetcher(
 432       new DummyDhcpProxyScriptAdapterFetcher(&context,
 433                                              client->GetTaskRunner()));
 434   adapter_fetcher->Configure(true, OK, L"bingo", 1);
 435   client->fetcher_.PushBackAdapter("a", adapter_fetcher.release());
 436   client->RunTest();
 437   client->RunMessageLoopUntilComplete();
 438   ASSERT_EQ(OK, client->result_);
 439   ASSERT_EQ(L"bingo", client->pac_text_);
 440 }
 441
 442 TEST(DhcpProxyScriptFetcherWin, NormalCaseURLConfiguredOneAdapter) {
 443   FetcherClient client;
 444   TestNormalCaseURLConfiguredOneAdapter(&client);
 445 }
 446
 447 void TestNormalCaseURLConfiguredMultipleAdapters(FetcherClient* client) {
 448   client->fetcher_.ConfigureAndPushBackAdapter(
 449       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 450       base::TimeDelta::FromMilliseconds(1));
 451   client->fetcher_.ConfigureAndPushBackAdapter(
 452       "second", true, OK, L"bingo", base::TimeDelta::FromMilliseconds(50));
 453   client->fetcher_.ConfigureAndPushBackAdapter(
 454       "third", true, OK, L"rocko", base::TimeDelta::FromMilliseconds(1));
 455   client->RunTest();
 456   client->RunMessageLoopUntilComplete();
 457   ASSERT_EQ(OK, client->result_);
 458   ASSERT_EQ(L"bingo", client->pac_text_);
 459 }
 460
 461 TEST(DhcpProxyScriptFetcherWin, NormalCaseURLConfiguredMultipleAdapters) {
 462   FetcherClient client;
 463   TestNormalCaseURLConfiguredMultipleAdapters(&client);
 464 }
 465
 466 void TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout(
 467     FetcherClient* client) {
 468   client->fetcher_.ConfigureAndPushBackAdapter(
 469       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 470       base::TimeDelta::FromMilliseconds(1));
 471   // This will time out.
 472   client->fetcher_.ConfigureAndPushBackAdapter(
 473       "second", false, ERR_IO_PENDING, L"bingo",
 474       TestTimeouts::action_timeout());
 475   client->fetcher_.ConfigureAndPushBackAdapter(
 476       "third", true, OK, L"rocko", base::TimeDelta::FromMilliseconds(1));
 477   client->RunTest();
 478   client->RunMessageLoopUntilComplete();
 479   ASSERT_EQ(OK, client->result_);
 480   ASSERT_EQ(L"rocko", client->pac_text_);
 481 }
 482
 483 TEST(DhcpProxyScriptFetcherWin,
 484      NormalCaseURLConfiguredMultipleAdaptersWithTimeout) {
 485   FetcherClient client;
 486   TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout(&client);
 487 }
 488
 489 void TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout(
 490     FetcherClient* client) {
 491   client->fetcher_.ConfigureAndPushBackAdapter(
 492       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 493       base::TimeDelta::FromMilliseconds(1));
 494   // This will time out.
 495   client->fetcher_.ConfigureAndPushBackAdapter(
 496       "second", false, ERR_IO_PENDING, L"bingo",
 497       TestTimeouts::action_timeout());
 498   // This is the first non-ERR_PAC_NOT_IN_DHCP error and as such
 499   // should be chosen.
 500   client->fetcher_.ConfigureAndPushBackAdapter(
 501       "third", true, ERR_PAC_STATUS_NOT_OK, L"",
 502       base::TimeDelta::FromMilliseconds(1));
 503   client->fetcher_.ConfigureAndPushBackAdapter(
 504       "fourth", true, ERR_NOT_IMPLEMENTED, L"",
 505       base::TimeDelta::FromMilliseconds(1));
 506   client->RunTest();
 507   client->RunMessageLoopUntilComplete();
 508   ASSERT_EQ(ERR_PAC_STATUS_NOT_OK, client->result_);
 509   ASSERT_EQ(L"", client->pac_text_);
 510 }
 511
 512 TEST(DhcpProxyScriptFetcherWin,
 513      FailureCaseURLConfiguredMultipleAdaptersWithTimeout) {
 514   FetcherClient client;
 515   TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout(&client);
 516 }
 517
 518 void TestFailureCaseNoURLConfigured(FetcherClient* client) {
 519   client->fetcher_.ConfigureAndPushBackAdapter(
 520       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 521       base::TimeDelta::FromMilliseconds(1));
 522   // This will time out.
 523   client->fetcher_.ConfigureAndPushBackAdapter(
 524       "second", false, ERR_IO_PENDING, L"bingo",
 525       TestTimeouts::action_timeout());
 526   // This is the first non-ERR_PAC_NOT_IN_DHCP error and as such
 527   // should be chosen.
 528   client->fetcher_.ConfigureAndPushBackAdapter(
 529       "third", true, ERR_PAC_NOT_IN_DHCP, L"",
 530       base::TimeDelta::FromMilliseconds(1));
 531   client->RunTest();
 532   client->RunMessageLoopUntilComplete();
 533   ASSERT_EQ(ERR_PAC_NOT_IN_DHCP, client->result_);
 534   ASSERT_EQ(L"", client->pac_text_);
 535 }
 536
 537 TEST(DhcpProxyScriptFetcherWin, FailureCaseNoURLConfigured) {
 538   FetcherClient client;
 539   TestFailureCaseNoURLConfigured(&client);
 540 }
 541
 542 void TestFailureCaseNoDhcpAdapters(FetcherClient* client) {
 543   client->RunTest();
 544   client->RunMessageLoopUntilComplete();
 545   ASSERT_EQ(ERR_PAC_NOT_IN_DHCP, client->result_);
 546   ASSERT_EQ(L"", client->pac_text_);
 547   ASSERT_EQ(0, client->fetcher_.num_fetchers_created_);
 548 }
 549
 550 TEST(DhcpProxyScriptFetcherWin, FailureCaseNoDhcpAdapters) {
 551   FetcherClient client;
 552   TestFailureCaseNoDhcpAdapters(&client);
 553 }
 554
 555 void TestShortCircuitLessPreferredAdapters(FetcherClient* client) {
 556   // Here we have a bunch of adapters; the first reports no PAC in DHCP,
 557   // the second responds quickly with a PAC file, the rest take a long
 558   // time.  Verify that we complete quickly and do not wait for the slow
 559   // adapters, i.e. we finish before timeout.
 560   client->fetcher_.ConfigureAndPushBackAdapter(
 561       "1", true, ERR_PAC_NOT_IN_DHCP, L"",
 562       base::TimeDelta::FromMilliseconds(1));
 563   client->fetcher_.ConfigureAndPushBackAdapter(
 564       "2", true, OK, L"bingo",
 565       base::TimeDelta::FromMilliseconds(1));
 566   client->fetcher_.ConfigureAndPushBackAdapter(
 567       "3", true, OK, L"wrongo", TestTimeouts::action_max_timeout());
 568
 569   // Increase the timeout to ensure the short circuit mechanism has
 570   // time to kick in before the timeout waiting for more adapters kicks in.
 571   client->fetcher_.max_wait_ = TestTimeouts::action_timeout();
 572
 573   base::ElapsedTimer timer;
 574   client->RunTest();
 575   client->RunMessageLoopUntilComplete();
 576   ASSERT_TRUE(client->fetcher_.HasPendingFetchers());
 577   // Assert that the time passed is definitely less than the wait timer
 578   // timeout, to get a second signal that it was the shortcut mechanism
 579   // (in OnFetcherDone) that kicked in, and not the timeout waiting for
 580   // more adapters.
 581   ASSERT_GT(client->fetcher_.max_wait_ - (client->fetcher_.max_wait_ / 10),
 582             timer.Elapsed());
 583 }
 584
 585 TEST(DhcpProxyScriptFetcherWin, ShortCircuitLessPreferredAdapters) {
 586   FetcherClient client;
 587   TestShortCircuitLessPreferredAdapters(&client);
 588 }
 589
 590 void TestImmediateCancel(FetcherClient* client) {
 591   TestURLRequestContext context;
 592   scoped_ptr<DummyDhcpProxyScriptAdapterFetcher> adapter_fetcher(
 593       new DummyDhcpProxyScriptAdapterFetcher(&context,
 594                                              client->GetTaskRunner()));
 595   adapter_fetcher->Configure(true, OK, L"bingo", 1);
 596   client->fetcher_.PushBackAdapter("a", adapter_fetcher.release());
 597   client->RunTest();
 598   client->fetcher_.Cancel();
 599   client->RunMessageLoopUntilWorkerDone();
 600   ASSERT_EQ(0, client->fetcher_.num_fetchers_created_);
 601 }
 602
 603 // Regression test to check that when we cancel immediately, no
 604 // adapter fetchers get created.
 605 TEST(DhcpProxyScriptFetcherWin, ImmediateCancel) {
 606   FetcherClient client;
 607   TestImmediateCancel(&client);
 608 }
 609
 610 TEST(DhcpProxyScriptFetcherWin, ReuseFetcher) {
 611   FetcherClient client;
 612
 613   // The ProxyScriptFetcher interface stipulates that only a single
 614   // |Fetch()| may be in flight at once, but allows reuse, so test
 615   // that the state transitions correctly from done to start in all
 616   // cases we're testing.
 617
 618   typedef void (*FetcherClientTestFunction)(FetcherClient*);
 619   typedef std::vector<FetcherClientTestFunction> TestVector;
 620   TestVector test_functions;
 621   test_functions.push_back(TestNormalCaseURLConfiguredOneAdapter);
 622   test_functions.push_back(TestNormalCaseURLConfiguredMultipleAdapters);
 623   test_functions.push_back(
 624       TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout);
 625   test_functions.push_back(
 626       TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout);
 627   test_functions.push_back(TestFailureCaseNoURLConfigured);
 628   test_functions.push_back(TestFailureCaseNoDhcpAdapters);
 629   test_functions.push_back(TestShortCircuitLessPreferredAdapters);
 630   test_functions.push_back(TestImmediateCancel);
 631
 632   std::random_shuffle(test_functions.begin(),
 633                       test_functions.end(),
 634                       base::RandGenerator);
 635   for (TestVector::const_iterator it = test_functions.begin();
 636        it != test_functions.end();
 637        ++it) {
 638     (*it)(&client);
 639     client.ResetTestState();
 640   }
 641
 642   // Re-do the first test to make sure the last test that was run did
 643   // not leave things in a bad state.
 644   (*test_functions.begin())(&client);
 645 }
 646
 647 }  // namespace
 648
 649 }  // namespace net