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/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       base::MessageLoop::current()->RunUntilIdle();
 103     }
 104     base::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   base::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   base::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   base::string16 GetPacScript() const OVERRIDE {
 243     return pac_script_;
 244   }
 245
 246   void OnTimer() {
 247     callback_.Run(result_);
 248   }
 249
 250   void Configure(bool did_finish,
 251                  int result,
 252                  base::string16 pac_script,
 253                  int fetch_delay_ms) {
 254     did_finish_ = did_finish;
 255     result_ = result;
 256     pac_script_ = pac_script;
 257     fetch_delay_ms_ = fetch_delay_ms;
 258   }
 259
 260  private:
 261   bool did_finish_;
 262   int result_;
 263   base::string16 pac_script_;
 264   int fetch_delay_ms_;
 265   CompletionCallback callback_;
 266   base::OneShotTimer<DummyDhcpProxyScriptAdapterFetcher> timer_;
 267 };
 268
 269 class MockDhcpProxyScriptFetcherWin : public DhcpProxyScriptFetcherWin {
 270  public:
 271   class MockAdapterQuery : public AdapterQuery {
 272    public:
 273     MockAdapterQuery() {
 274     }
 275
 276     virtual ~MockAdapterQuery() {
 277     }
 278
 279     virtual bool ImplGetCandidateAdapterNames(
 280         std::set<std::string>* adapter_names) OVERRIDE {
 281       adapter_names->insert(
 282           mock_adapter_names_.begin(), mock_adapter_names_.end());
 283       return true;
 284     }
 285
 286     std::vector<std::string> mock_adapter_names_;
 287   };
 288
 289   MockDhcpProxyScriptFetcherWin(URLRequestContext* context)
 290       : DhcpProxyScriptFetcherWin(context),
 291         num_fetchers_created_(0),
 292         worker_finished_event_(true, false) {
 293     ResetTestState();
 294   }
 295
 296   virtual ~MockDhcpProxyScriptFetcherWin() {
 297     ResetTestState();
 298   }
 299
 300   // Adds a fetcher object to the queue of fetchers used by
 301   // |ImplCreateAdapterFetcher()|, and its name to the list of adapters
 302   // returned by ImplGetCandidateAdapterNames.
 303   void PushBackAdapter(const std::string& adapter_name,
 304                        DhcpProxyScriptAdapterFetcher* fetcher) {
 305     adapter_query_->mock_adapter_names_.push_back(adapter_name);
 306     adapter_fetchers_.push_back(fetcher);
 307   }
 308
 309   void ConfigureAndPushBackAdapter(const std::string& adapter_name,
 310                                    bool did_finish,
 311                                    int result,
 312                                    base::string16 pac_script,
 313                                    base::TimeDelta fetch_delay) {
 314     scoped_ptr<DummyDhcpProxyScriptAdapterFetcher> adapter_fetcher(
 315         new DummyDhcpProxyScriptAdapterFetcher(url_request_context()));
 316     adapter_fetcher->Configure(
 317         did_finish, result, pac_script, fetch_delay.InMilliseconds());
 318     PushBackAdapter(adapter_name, adapter_fetcher.release());
 319   }
 320
 321   DhcpProxyScriptAdapterFetcher* ImplCreateAdapterFetcher() OVERRIDE {
 322     ++num_fetchers_created_;
 323     return adapter_fetchers_[next_adapter_fetcher_index_++];
 324   }
 325
 326   virtual AdapterQuery* ImplCreateAdapterQuery() OVERRIDE {
 327     DCHECK(adapter_query_);
 328     return adapter_query_.get();
 329   }
 330
 331   base::TimeDelta ImplGetMaxWait() OVERRIDE {
 332     return max_wait_;
 333   }
 334
 335   void ImplOnGetCandidateAdapterNamesDone() OVERRIDE {
 336     worker_finished_event_.Signal();
 337   }
 338
 339   void ResetTestState() {
 340     // Delete any adapter fetcher objects we didn't hand out.
 341     std::vector<DhcpProxyScriptAdapterFetcher*>::const_iterator it
 342         = adapter_fetchers_.begin();
 343     for (; it != adapter_fetchers_.end(); ++it) {
 344       if (num_fetchers_created_-- <= 0) {
 345         delete (*it);
 346       }
 347     }
 348
 349     next_adapter_fetcher_index_ = 0;
 350     num_fetchers_created_ = 0;
 351     adapter_fetchers_.clear();
 352     adapter_query_ = new MockAdapterQuery();
 353     max_wait_ = TestTimeouts::tiny_timeout();
 354   }
 355
 356   bool HasPendingFetchers() {
 357     return num_pending_fetchers() > 0;
 358   }
 359
 360   int next_adapter_fetcher_index_;
 361
 362   // Ownership gets transferred to the implementation class via
 363   // ImplCreateAdapterFetcher, but any objects not handed out are
 364   // deleted on destruction.
 365   std::vector<DhcpProxyScriptAdapterFetcher*> adapter_fetchers_;
 366
 367   scoped_refptr<MockAdapterQuery> adapter_query_;
 368
 369   base::TimeDelta max_wait_;
 370   int num_fetchers_created_;
 371   base::WaitableEvent worker_finished_event_;
 372 };
 373
 374 class FetcherClient {
 375 public:
 376   FetcherClient()
 377       : context_(new TestURLRequestContext),
 378         fetcher_(context_.get()),
 379         finished_(false),
 380         result_(ERR_UNEXPECTED) {
 381   }
 382
 383   void RunTest() {
 384     int result = fetcher_.Fetch(
 385         &pac_text_,
 386         base::Bind(&FetcherClient::OnCompletion, base::Unretained(this)));
 387     ASSERT_EQ(ERR_IO_PENDING, result);
 388   }
 389
 390   void RunMessageLoopUntilComplete() {
 391     while (!finished_) {
 392       base::MessageLoop::current()->RunUntilIdle();
 393     }
 394     base::MessageLoop::current()->RunUntilIdle();
 395   }
 396
 397   void RunMessageLoopUntilWorkerDone() {
 398     DCHECK(fetcher_.adapter_query_.get());
 399     while (!fetcher_.worker_finished_event_.TimedWait(
 400         base::TimeDelta::FromMilliseconds(10))) {
 401       base::MessageLoop::current()->RunUntilIdle();
 402     }
 403   }
 404
 405   void OnCompletion(int result) {
 406     finished_ = true;
 407     result_ = result;
 408   }
 409
 410   void ResetTestState() {
 411     finished_ = false;
 412     result_ = ERR_UNEXPECTED;
 413     pac_text_ = L"";
 414     fetcher_.ResetTestState();
 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   adapter_fetcher->Configure(true, OK, L"bingo", 1);
 431   client->fetcher_.PushBackAdapter("a", adapter_fetcher.release());
 432   client->RunTest();
 433   client->RunMessageLoopUntilComplete();
 434   ASSERT_EQ(OK, client->result_);
 435   ASSERT_EQ(L"bingo", client->pac_text_);
 436 }
 437
 438 TEST(DhcpProxyScriptFetcherWin, NormalCaseURLConfiguredOneAdapter) {
 439   FetcherClient client;
 440   TestNormalCaseURLConfiguredOneAdapter(&client);
 441 }
 442
 443 void TestNormalCaseURLConfiguredMultipleAdapters(FetcherClient* client) {
 444   client->fetcher_.ConfigureAndPushBackAdapter(
 445       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 446       base::TimeDelta::FromMilliseconds(1));
 447   client->fetcher_.ConfigureAndPushBackAdapter(
 448       "second", true, OK, L"bingo", base::TimeDelta::FromMilliseconds(50));
 449   client->fetcher_.ConfigureAndPushBackAdapter(
 450       "third", true, OK, L"rocko", base::TimeDelta::FromMilliseconds(1));
 451   client->RunTest();
 452   client->RunMessageLoopUntilComplete();
 453   ASSERT_EQ(OK, client->result_);
 454   ASSERT_EQ(L"bingo", client->pac_text_);
 455 }
 456
 457 TEST(DhcpProxyScriptFetcherWin, NormalCaseURLConfiguredMultipleAdapters) {
 458   FetcherClient client;
 459   TestNormalCaseURLConfiguredMultipleAdapters(&client);
 460 }
 461
 462 void TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout(
 463     FetcherClient* client) {
 464   client->fetcher_.ConfigureAndPushBackAdapter(
 465       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 466       base::TimeDelta::FromMilliseconds(1));
 467   // This will time out.
 468   client->fetcher_.ConfigureAndPushBackAdapter(
 469       "second", false, ERR_IO_PENDING, L"bingo",
 470       TestTimeouts::action_timeout());
 471   client->fetcher_.ConfigureAndPushBackAdapter(
 472       "third", true, OK, L"rocko", base::TimeDelta::FromMilliseconds(1));
 473   client->RunTest();
 474   client->RunMessageLoopUntilComplete();
 475   ASSERT_EQ(OK, client->result_);
 476   ASSERT_EQ(L"rocko", client->pac_text_);
 477 }
 478
 479 TEST(DhcpProxyScriptFetcherWin,
 480      NormalCaseURLConfiguredMultipleAdaptersWithTimeout) {
 481   FetcherClient client;
 482   TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout(&client);
 483 }
 484
 485 void TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout(
 486     FetcherClient* client) {
 487   client->fetcher_.ConfigureAndPushBackAdapter(
 488       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 489       base::TimeDelta::FromMilliseconds(1));
 490   // This will time out.
 491   client->fetcher_.ConfigureAndPushBackAdapter(
 492       "second", false, ERR_IO_PENDING, L"bingo",
 493       TestTimeouts::action_timeout());
 494   // This is the first non-ERR_PAC_NOT_IN_DHCP error and as such
 495   // should be chosen.
 496   client->fetcher_.ConfigureAndPushBackAdapter(
 497       "third", true, ERR_PAC_STATUS_NOT_OK, L"",
 498       base::TimeDelta::FromMilliseconds(1));
 499   client->fetcher_.ConfigureAndPushBackAdapter(
 500       "fourth", true, ERR_NOT_IMPLEMENTED, L"",
 501       base::TimeDelta::FromMilliseconds(1));
 502   client->RunTest();
 503   client->RunMessageLoopUntilComplete();
 504   ASSERT_EQ(ERR_PAC_STATUS_NOT_OK, client->result_);
 505   ASSERT_EQ(L"", client->pac_text_);
 506 }
 507
 508 TEST(DhcpProxyScriptFetcherWin,
 509      FailureCaseURLConfiguredMultipleAdaptersWithTimeout) {
 510   FetcherClient client;
 511   TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout(&client);
 512 }
 513
 514 void TestFailureCaseNoURLConfigured(FetcherClient* client) {
 515   client->fetcher_.ConfigureAndPushBackAdapter(
 516       "most_preferred", true, ERR_PAC_NOT_IN_DHCP, L"",
 517       base::TimeDelta::FromMilliseconds(1));
 518   // This will time out.
 519   client->fetcher_.ConfigureAndPushBackAdapter(
 520       "second", false, ERR_IO_PENDING, L"bingo",
 521       TestTimeouts::action_timeout());
 522   // This is the first non-ERR_PAC_NOT_IN_DHCP error and as such
 523   // should be chosen.
 524   client->fetcher_.ConfigureAndPushBackAdapter(
 525       "third", true, ERR_PAC_NOT_IN_DHCP, L"",
 526       base::TimeDelta::FromMilliseconds(1));
 527   client->RunTest();
 528   client->RunMessageLoopUntilComplete();
 529   ASSERT_EQ(ERR_PAC_NOT_IN_DHCP, client->result_);
 530   ASSERT_EQ(L"", client->pac_text_);
 531 }
 532
 533 TEST(DhcpProxyScriptFetcherWin, FailureCaseNoURLConfigured) {
 534   FetcherClient client;
 535   TestFailureCaseNoURLConfigured(&client);
 536 }
 537
 538 void TestFailureCaseNoDhcpAdapters(FetcherClient* client) {
 539   client->RunTest();
 540   client->RunMessageLoopUntilComplete();
 541   ASSERT_EQ(ERR_PAC_NOT_IN_DHCP, client->result_);
 542   ASSERT_EQ(L"", client->pac_text_);
 543   ASSERT_EQ(0, client->fetcher_.num_fetchers_created_);
 544 }
 545
 546 TEST(DhcpProxyScriptFetcherWin, FailureCaseNoDhcpAdapters) {
 547   FetcherClient client;
 548   TestFailureCaseNoDhcpAdapters(&client);
 549 }
 550
 551 void TestShortCircuitLessPreferredAdapters(FetcherClient* client) {
 552   // Here we have a bunch of adapters; the first reports no PAC in DHCP,
 553   // the second responds quickly with a PAC file, the rest take a long
 554   // time.  Verify that we complete quickly and do not wait for the slow
 555   // adapters, i.e. we finish before timeout.
 556   client->fetcher_.ConfigureAndPushBackAdapter(
 557       "1", true, ERR_PAC_NOT_IN_DHCP, L"",
 558       base::TimeDelta::FromMilliseconds(1));
 559   client->fetcher_.ConfigureAndPushBackAdapter(
 560       "2", true, OK, L"bingo",
 561       base::TimeDelta::FromMilliseconds(1));
 562   client->fetcher_.ConfigureAndPushBackAdapter(
 563       "3", true, OK, L"wrongo", TestTimeouts::action_max_timeout());
 564
 565   // Increase the timeout to ensure the short circuit mechanism has
 566   // time to kick in before the timeout waiting for more adapters kicks in.
 567   client->fetcher_.max_wait_ = TestTimeouts::action_timeout();
 568
 569   PerfTimer timer;
 570   client->RunTest();
 571   client->RunMessageLoopUntilComplete();
 572   ASSERT_TRUE(client->fetcher_.HasPendingFetchers());
 573   // Assert that the time passed is definitely less than the wait timer
 574   // timeout, to get a second signal that it was the shortcut mechanism
 575   // (in OnFetcherDone) that kicked in, and not the timeout waiting for
 576   // more adapters.
 577   ASSERT_GT(client->fetcher_.max_wait_ - (client->fetcher_.max_wait_ / 10),
 578             timer.Elapsed());
 579 }
 580
 581 TEST(DhcpProxyScriptFetcherWin, ShortCircuitLessPreferredAdapters) {
 582   FetcherClient client;
 583   TestShortCircuitLessPreferredAdapters(&client);
 584 }
 585
 586 void TestImmediateCancel(FetcherClient* client) {
 587   TestURLRequestContext context;
 588   scoped_ptr<DummyDhcpProxyScriptAdapterFetcher> adapter_fetcher(
 589       new DummyDhcpProxyScriptAdapterFetcher(&context));
 590   adapter_fetcher->Configure(true, OK, L"bingo", 1);
 591   client->fetcher_.PushBackAdapter("a", adapter_fetcher.release());
 592   client->RunTest();
 593   client->fetcher_.Cancel();
 594   client->RunMessageLoopUntilWorkerDone();
 595   ASSERT_EQ(0, client->fetcher_.num_fetchers_created_);
 596 }
 597
 598 // Regression test to check that when we cancel immediately, no
 599 // adapter fetchers get created.
 600 TEST(DhcpProxyScriptFetcherWin, ImmediateCancel) {
 601   FetcherClient client;
 602   TestImmediateCancel(&client);
 603 }
 604
 605 TEST(DhcpProxyScriptFetcherWin, ReuseFetcher) {
 606   FetcherClient client;
 607
 608   // The ProxyScriptFetcher interface stipulates that only a single
 609   // |Fetch()| may be in flight at once, but allows reuse, so test
 610   // that the state transitions correctly from done to start in all
 611   // cases we're testing.
 612
 613   typedef void (*FetcherClientTestFunction)(FetcherClient*);
 614   typedef std::vector<FetcherClientTestFunction> TestVector;
 615   TestVector test_functions;
 616   test_functions.push_back(TestNormalCaseURLConfiguredOneAdapter);
 617   test_functions.push_back(TestNormalCaseURLConfiguredMultipleAdapters);
 618   test_functions.push_back(
 619       TestNormalCaseURLConfiguredMultipleAdaptersWithTimeout);
 620   test_functions.push_back(
 621       TestFailureCaseURLConfiguredMultipleAdaptersWithTimeout);
 622   test_functions.push_back(TestFailureCaseNoURLConfigured);
 623   test_functions.push_back(TestFailureCaseNoDhcpAdapters);
 624   test_functions.push_back(TestShortCircuitLessPreferredAdapters);
 625   test_functions.push_back(TestImmediateCancel);
 626
 627   std::random_shuffle(test_functions.begin(),
 628                       test_functions.end(),
 629                       base::RandGenerator);
 630   for (TestVector::const_iterator it = test_functions.begin();
 631        it != test_functions.end();
 632        ++it) {
 633     (*it)(&client);
 634     client.ResetTestState();
 635   }
 636
 637   // Re-do the first test to make sure the last test that was run did
 638   // not leave things in a bad state.
 639   (*test_functions.begin())(&client);
 640 }
 641
 642 }  // namespace
 643
 644 }  // namespace net