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     ~MockAdapterQuery() override {}
 273
 274     bool ImplGetCandidateAdapterNames(
 275         std::set<std::string>* adapter_names) override {
 276       adapter_names->insert(
 277           mock_adapter_names_.begin(), mock_adapter_names_.end());
 278       return true;
 279     }
 280
 281     std::vector<std::string> mock_adapter_names_;
 282   };
 283
 284   MockDhcpProxyScriptFetcherWin(URLRequestContext* context)
 285       : DhcpProxyScriptFetcherWin(context),
 286         num_fetchers_created_(0),
 287         worker_finished_event_(true, false) {
 288     ResetTestState();
 289   }
 290
 291   ~MockDhcpProxyScriptFetcherWin() override { ResetTestState(); }
 292
 293   using DhcpProxyScriptFetcherWin::GetTaskRunner;
 294
 295   // Adds a fetcher object to the queue of fetchers used by
 296   // |ImplCreateAdapterFetcher()|, and its name to the list of adapters
 297   // returned by ImplGetCandidateAdapterNames.
 298   void PushBackAdapter(const std::string& adapter_name,
 299                        DhcpProxyScriptAdapterFetcher* fetcher) {
 300     adapter_query_->mock_adapter_names_.push_back(adapter_name);
 301     adapter_fetchers_.push_back(fetcher);
 302   }
 303
 304   void ConfigureAndPushBackAdapter(const std::string& adapter_name,
 305                                    bool did_finish,
 306                                    int result,
 307                                    base::string16 pac_script,
 308                                    base::TimeDelta fetch_delay) {
 309     scoped_ptr<DummyDhcpProxyScriptAdapterFetcher> adapter_fetcher(
 310         new DummyDhcpProxyScriptAdapterFetcher(url_request_context(),
 311                                                GetTaskRunner()));
 312     adapter_fetcher->Configure(
 313         did_finish, result, pac_script, fetch_delay.InMilliseconds());
 314     PushBackAdapter(adapter_name, adapter_fetcher.release());
 315   }
 316
 317   DhcpProxyScriptAdapterFetcher* ImplCreateAdapterFetcher() override {
 318     ++num_fetchers_created_;
 319     return adapter_fetchers_[next_adapter_fetcher_index_++];
 320   }
 321
 322   AdapterQuery* ImplCreateAdapterQuery() override {
 323     DCHECK(adapter_query_.get());
 324     return adapter_query_.get();
 325   }
 326
 327   base::TimeDelta ImplGetMaxWait() override {
 328     return max_wait_;
 329   }
 330
 331   void ImplOnGetCandidateAdapterNamesDone() override {
 332     worker_finished_event_.Signal();
 333   }
 334
 335   void ResetTestState() {
 336     // Delete any adapter fetcher objects we didn't hand out.
 337     std::vector<DhcpProxyScriptAdapterFetcher*>::const_iterator it
 338         = adapter_fetchers_.begin();
 339     for (; it != adapter_fetchers_.end(); ++it) {
 340       if (num_fetchers_created_-- <= 0) {
 341         delete (*it);
 342       }
 343     }
 344
 345     next_adapter_fetcher_index_ = 0;
 346     num_fetchers_created_ = 0;
 347     adapter_fetchers_.clear();
 348     adapter_query_ = new MockAdapterQuery();
 349     max_wait_ = TestTimeouts::tiny_timeout();
 350   }
 351
 352   bool HasPendingFetchers() {
 353     return num_pending_fetchers() > 0;
 354   }
 355
 356   int next_adapter_fetcher_index_;
 357
 358   // Ownership gets transferred to the implementation class via
 359   // ImplCreateAdapterFetcher, but any objects not handed out are
 360   // deleted on destruction.
 361   std::vector<DhcpProxyScriptAdapterFetcher*> adapter_fetchers_;
 362
 363   scoped_refptr<MockAdapterQuery> adapter_query_;
 364
 365   base::TimeDelta max_wait_;
 366   int num_fetchers_created_;
 367   base::WaitableEvent worker_finished_event_;
 368 };
 369
 370 class FetcherClient {
 371  public:
 372   FetcherClient()
 373       : context_(new TestURLRequestContext),
 374         fetcher_(context_.get()),
 375         finished_(false),
 376         result_(ERR_UNEXPECTED) {
 377   }
 378
 379   void RunTest() {
 380     int result = fetcher_.Fetch(
 381         &pac_text_,
 382         base::Bind(&FetcherClient::OnCompletion, base::Unretained(this)));
 383     ASSERT_EQ(ERR_IO_PENDING, result);
 384   }
 385
 386   void RunMessageLoopUntilComplete() {
 387     while (!finished_) {
 388       base::MessageLoop::current()->RunUntilIdle();
 389     }
 390     base::MessageLoop::current()->RunUntilIdle();
 391   }
 392
 393   void RunMessageLoopUntilWorkerDone() {
 394     DCHECK(fetcher_.adapter_query_.get());
 395     while (!fetcher_.worker_finished_event_.TimedWait(
 396         base::TimeDelta::FromMilliseconds(10))) {
 397       base::MessageLoop::current()->RunUntilIdle();
 398     }
 399   }
 400
 401   void OnCompletion(int result) {
 402     finished_ = true;
 403     result_ = result;
 404   }
 405
 406   void ResetTestState() {
 407     finished_ = false;
 408     result_ = ERR_UNEXPECTED;
 409     pac_text_ = L"";
 410     fetcher_.ResetTestState();
 411   }
 412
 413   scoped_refptr<base::TaskRunner> GetTaskRunner() {
 414     return fetcher_.GetTaskRunner();
 415   }
 416
 417   scoped_ptr<URLRequestContext> context_;
 418   MockDhcpProxyScriptFetcherWin fetcher_;
 419   bool finished_;
 420   int result_;
 421   base::string16 pac_text_;
 422 };
 423
 424 // We separate out each test's logic so that we can easily implement
 425 // the ReuseFetcher test at the bottom.
 426 void TestNormalCaseURLConfiguredOneAdapter(FetcherClient* client) {
 427   TestURLRequestContext context;
 428   scoped_ptr<DummyDhcpProxyScriptAdapterFetcher> adapter_fetcher(
 429       new DummyDhcpProxyScriptAdapterFetcher(&context,
 430                                              client->GetTaskRunner()));
 431   adapter_fetcher->Configure(true, OK, L"bingo", 1);
 432   client->fetcher_.PushBackAdapter("a", adapter_fetcher.release());
 433   client->RunTest();
 434   client->RunMessageLoopUntilComplete();
 435   ASSERT_EQ(OK, client->result_);
 436   ASSERT_EQ(L"bingo", client->pac_text_);
 437 }
 438
 439 TEST(DhcpProxyScriptFetcherWin, NormalCaseURLConfiguredOneAdapter) {
 440   FetcherClient client;
 441   TestNormalCaseURLConfiguredOneAdapter(&client);
 442 }
 443
 444 void TestNormalCaseURLConfiguredMultipleAdapters(FetcherClient* client) {
 445   client->fetcher_.ConfigureAndPushBackAdapter(
 446       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 447       base::TimeDelta::FromMilliseconds(1));
 448   client->fetcher_.ConfigureAndPushBackAdapter(
 449       "second", true, OK, L"bingo", base::TimeDelta::FromMilliseconds(50));
 450   client->fetcher_.ConfigureAndPushBackAdapter(
 451       "third", true, OK, L"rocko", base::TimeDelta::FromMilliseconds(1));
 452   client->RunTest();
 453   client->RunMessageLoopUntilComplete();
 454   ASSERT_EQ(OK, client->result_);
 455   ASSERT_EQ(L"bingo", client->pac_text_);
 456 }
 457
 458 TEST(DhcpProxyScriptFetcherWin, NormalCaseURLConfiguredMultipleAdapters) {
 459   FetcherClient client;
 460   TestNormalCaseURLConfiguredMultipleAdapters(&client);
 461 }
 462
 463 void TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout(
 464     FetcherClient* client) {
 465   client->fetcher_.ConfigureAndPushBackAdapter(
 466       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 467       base::TimeDelta::FromMilliseconds(1));
 468   // This will time out.
 469   client->fetcher_.ConfigureAndPushBackAdapter(
 470       "second", false, ERR_IO_PENDING, L"bingo",
 471       TestTimeouts::action_timeout());
 472   client->fetcher_.ConfigureAndPushBackAdapter(
 473       "third", true, OK, L"rocko", base::TimeDelta::FromMilliseconds(1));
 474   client->RunTest();
 475   client->RunMessageLoopUntilComplete();
 476   ASSERT_EQ(OK, client->result_);
 477   ASSERT_EQ(L"rocko", client->pac_text_);
 478 }
 479
 480 TEST(DhcpProxyScriptFetcherWin,
 481      NormalCaseURLConfiguredMultipleAdaptersWithTimeout) {
 482   FetcherClient client;
 483   TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout(&client);
 484 }
 485
 486 void TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout(
 487     FetcherClient* client) {
 488   client->fetcher_.ConfigureAndPushBackAdapter(
 489       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 490       base::TimeDelta::FromMilliseconds(1));
 491   // This will time out.
 492   client->fetcher_.ConfigureAndPushBackAdapter(
 493       "second", false, ERR_IO_PENDING, L"bingo",
 494       TestTimeouts::action_timeout());
 495   // This is the first non-ERR_PAC_NOT_IN_DHCP error and as such
 496   // should be chosen.
 497   client->fetcher_.ConfigureAndPushBackAdapter(
 498       "third", true, ERR_PAC_STATUS_NOT_OK, L"",
 499       base::TimeDelta::FromMilliseconds(1));
 500   client->fetcher_.ConfigureAndPushBackAdapter(
 501       "fourth", true, ERR_NOT_IMPLEMENTED, L"",
 502       base::TimeDelta::FromMilliseconds(1));
 503   client->RunTest();
 504   client->RunMessageLoopUntilComplete();
 505   ASSERT_EQ(ERR_PAC_STATUS_NOT_OK, client->result_);
 506   ASSERT_EQ(L"", client->pac_text_);
 507 }
 508
 509 TEST(DhcpProxyScriptFetcherWin,
 510      FailureCaseURLConfiguredMultipleAdaptersWithTimeout) {
 511   FetcherClient client;
 512   TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout(&client);
 513 }
 514
 515 void TestFailureCaseNoURLConfigured(FetcherClient* client) {
 516   client->fetcher_.ConfigureAndPushBackAdapter(
 517       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 518       base::TimeDelta::FromMilliseconds(1));
 519   // This will time out.
 520   client->fetcher_.ConfigureAndPushBackAdapter(
 521       "second", false, ERR_IO_PENDING, L"bingo",
 522       TestTimeouts::action_timeout());
 523   // This is the first non-ERR_PAC_NOT_IN_DHCP error and as such
 524   // should be chosen.
 525   client->fetcher_.ConfigureAndPushBackAdapter(
 526       "third", true, ERR_PAC_NOT_IN_DHCP, L"",
 527       base::TimeDelta::FromMilliseconds(1));
 528   client->RunTest();
 529   client->RunMessageLoopUntilComplete();
 530   ASSERT_EQ(ERR_PAC_NOT_IN_DHCP, client->result_);
 531   ASSERT_EQ(L"", client->pac_text_);
 532 }
 533
 534 TEST(DhcpProxyScriptFetcherWin, FailureCaseNoURLConfigured) {
 535   FetcherClient client;
 536   TestFailureCaseNoURLConfigured(&client);
 537 }
 538
 539 void TestFailureCaseNoDhcpAdapters(FetcherClient* client) {
 540   client->RunTest();
 541   client->RunMessageLoopUntilComplete();
 542   ASSERT_EQ(ERR_PAC_NOT_IN_DHCP, client->result_);
 543   ASSERT_EQ(L"", client->pac_text_);
 544   ASSERT_EQ(0, client->fetcher_.num_fetchers_created_);
 545 }
 546
 547 TEST(DhcpProxyScriptFetcherWin, FailureCaseNoDhcpAdapters) {
 548   FetcherClient client;
 549   TestFailureCaseNoDhcpAdapters(&client);
 550 }
 551
 552 void TestShortCircuitLessPreferredAdapters(FetcherClient* client) {
 553   // Here we have a bunch of adapters; the first reports no PAC in DHCP,
 554   // the second responds quickly with a PAC file, the rest take a long
 555   // time.  Verify that we complete quickly and do not wait for the slow
 556   // adapters, i.e. we finish before timeout.
 557   client->fetcher_.ConfigureAndPushBackAdapter(
 558       "1", true, ERR_PAC_NOT_IN_DHCP, L"",
 559       base::TimeDelta::FromMilliseconds(1));
 560   client->fetcher_.ConfigureAndPushBackAdapter(
 561       "2", true, OK, L"bingo",
 562       base::TimeDelta::FromMilliseconds(1));
 563   client->fetcher_.ConfigureAndPushBackAdapter(
 564       "3", true, OK, L"wrongo", TestTimeouts::action_max_timeout());
 565
 566   // Increase the timeout to ensure the short circuit mechanism has
 567   // time to kick in before the timeout waiting for more adapters kicks in.
 568   client->fetcher_.max_wait_ = TestTimeouts::action_timeout();
 569
 570   base::ElapsedTimer timer;
 571   client->RunTest();
 572   client->RunMessageLoopUntilComplete();
 573   ASSERT_TRUE(client->fetcher_.HasPendingFetchers());
 574   // Assert that the time passed is definitely less than the wait timer
 575   // timeout, to get a second signal that it was the shortcut mechanism
 576   // (in OnFetcherDone) that kicked in, and not the timeout waiting for
 577   // more adapters.
 578   ASSERT_GT(client->fetcher_.max_wait_ - (client->fetcher_.max_wait_ / 10),
 579             timer.Elapsed());
 580 }
 581
 582 TEST(DhcpProxyScriptFetcherWin, ShortCircuitLessPreferredAdapters) {
 583   FetcherClient client;
 584   TestShortCircuitLessPreferredAdapters(&client);
 585 }
 586
 587 void TestImmediateCancel(FetcherClient* client) {
 588   TestURLRequestContext context;
 589   scoped_ptr<DummyDhcpProxyScriptAdapterFetcher> adapter_fetcher(
 590       new DummyDhcpProxyScriptAdapterFetcher(&context,
 591                                              client->GetTaskRunner()));
 592   adapter_fetcher->Configure(true, OK, L"bingo", 1);
 593   client->fetcher_.PushBackAdapter("a", adapter_fetcher.release());
 594   client->RunTest();
 595   client->fetcher_.Cancel();
 596   client->RunMessageLoopUntilWorkerDone();
 597   ASSERT_EQ(0, client->fetcher_.num_fetchers_created_);
 598 }
 599
 600 // Regression test to check that when we cancel immediately, no
 601 // adapter fetchers get created.
 602 TEST(DhcpProxyScriptFetcherWin, ImmediateCancel) {
 603   FetcherClient client;
 604   TestImmediateCancel(&client);
 605 }
 606
 607 TEST(DhcpProxyScriptFetcherWin, ReuseFetcher) {
 608   FetcherClient client;
 609
 610   // The ProxyScriptFetcher interface stipulates that only a single
 611   // |Fetch()| may be in flight at once, but allows reuse, so test
 612   // that the state transitions correctly from done to start in all
 613   // cases we're testing.
 614
 615   typedef void (*FetcherClientTestFunction)(FetcherClient*);
 616   typedef std::vector<FetcherClientTestFunction> TestVector;
 617   TestVector test_functions;
 618   test_functions.push_back(TestNormalCaseURLConfiguredOneAdapter);
 619   test_functions.push_back(TestNormalCaseURLConfiguredMultipleAdapters);
 620   test_functions.push_back(
 621       TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout);
 622   test_functions.push_back(
 623       TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout);
 624   test_functions.push_back(TestFailureCaseNoURLConfigured);
 625   test_functions.push_back(TestFailureCaseNoDhcpAdapters);
 626   test_functions.push_back(TestShortCircuitLessPreferredAdapters);
 627   test_functions.push_back(TestImmediateCancel);
 628
 629   std::random_shuffle(test_functions.begin(),
 630                       test_functions.end(),
 631                       base::RandGenerator);
 632   for (TestVector::const_iterator it = test_functions.begin();
 633        it != test_functions.end();
 634        ++it) {
 635     (*it)(&client);
 636     client.ResetTestState();
 637   }
 638
 639   // Re-do the first test to make sure the last test that was run did
 640   // not leave things in a bad state.
 641   (*test_functions.begin())(&client);
 642 }
 643
 644 }  // namespace
 645
 646 }  // namespace net