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