ceph/src/rapidjson/thirdparty/gtest/googlemock/test/gmock_stress_test.cc

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  29 //
  30 // Author: wan@google.com (Zhanyong Wan)
  31
  32 // Tests that Google Mock constructs can be used in a large number of
  33 // threads concurrently.
  34
  35 #include "gmock/gmock.h"
  36 #include "gtest/gtest.h"
  37
  38 namespace testing {
  39 namespace {
  40
  41 // From <gtest/internal/gtest-port.h>.
  42 using ::testing::internal::ThreadWithParam;
  43
  44 // The maximum number of test threads (not including helper threads)
  45 // to create.
  46 const int kMaxTestThreads = 50;
  47
  48 // How many times to repeat a task in a test thread.
  49 const int kRepeat = 50;
  50
  51 class MockFoo {
  52  public:
  53   MOCK_METHOD1(Bar, int(int n));  // NOLINT
  54   MOCK_METHOD2(Baz, char(const char* s1, const internal::string& s2));  // NOLINT
  55 };
  56
  57 // Helper for waiting for the given thread to finish and then deleting it.
  58 template <typename T>
  59 void JoinAndDelete(ThreadWithParam<T>* t) {
  60   t->Join();
  61   delete t;
  62 }
  63
  64 using internal::linked_ptr;
  65
  66 // Helper classes for testing using linked_ptr concurrently.
  67
  68 class Base {
  69  public:
  70   explicit Base(int a_x) : x_(a_x) {}
  71   virtual ~Base() {}
  72   int x() const { return x_; }
  73  private:
  74   int x_;
  75 };
  76
  77 class Derived1 : public Base {
  78  public:
  79   Derived1(int a_x, int a_y) : Base(a_x), y_(a_y) {}
  80   int y() const { return y_; }
  81  private:
  82   int y_;
  83 };
  84
  85 class Derived2 : public Base {
  86  public:
  87   Derived2(int a_x, int a_z) : Base(a_x), z_(a_z) {}
  88   int z() const { return z_; }
  89  private:
  90   int z_;
  91 };
  92
  93 linked_ptr<Derived1> pointer1(new Derived1(1, 2));
  94 linked_ptr<Derived2> pointer2(new Derived2(3, 4));
  95
  96 struct Dummy {};
  97
  98 // Tests that we can copy from a linked_ptr and read it concurrently.
  99 void TestConcurrentCopyAndReadLinkedPtr(Dummy /* dummy */) {
 100   // Reads pointer1 and pointer2 while they are being copied from in
 101   // another thread.
 102   EXPECT_EQ(1, pointer1->x());
 103   EXPECT_EQ(2, pointer1->y());
 104   EXPECT_EQ(3, pointer2->x());
 105   EXPECT_EQ(4, pointer2->z());
 106
 107   // Copies from pointer1.
 108   linked_ptr<Derived1> p1(pointer1);
 109   EXPECT_EQ(1, p1->x());
 110   EXPECT_EQ(2, p1->y());
 111
 112   // Assigns from pointer2 where the LHS was empty.
 113   linked_ptr<Base> p2;
 114   p2 = pointer1;
 115   EXPECT_EQ(1, p2->x());
 116
 117   // Assigns from pointer2 where the LHS was not empty.
 118   p2 = pointer2;
 119   EXPECT_EQ(3, p2->x());
 120 }
 121
 122 const linked_ptr<Derived1> p0(new Derived1(1, 2));
 123
 124 // Tests that we can concurrently modify two linked_ptrs that point to
 125 // the same object.
 126 void TestConcurrentWriteToEqualLinkedPtr(Dummy /* dummy */) {
 127   // p1 and p2 point to the same, shared thing.  One thread resets p1.
 128   // Another thread assigns to p2.  This will cause the same
 129   // underlying "ring" to be updated concurrently.
 130   linked_ptr<Derived1> p1(p0);
 131   linked_ptr<Derived1> p2(p0);
 132
 133   EXPECT_EQ(1, p1->x());
 134   EXPECT_EQ(2, p1->y());
 135
 136   EXPECT_EQ(1, p2->x());
 137   EXPECT_EQ(2, p2->y());
 138
 139   p1.reset();
 140   p2 = p0;
 141
 142   EXPECT_EQ(1, p2->x());
 143   EXPECT_EQ(2, p2->y());
 144 }
 145
 146 // Tests that different mock objects can be used in their respective
 147 // threads.  This should generate no Google Test failure.
 148 void TestConcurrentMockObjects(Dummy /* dummy */) {
 149   // Creates a mock and does some typical operations on it.
 150   MockFoo foo;
 151   ON_CALL(foo, Bar(_))
 152       .WillByDefault(Return(1));
 153   ON_CALL(foo, Baz(_, _))
 154       .WillByDefault(Return('b'));
 155   ON_CALL(foo, Baz(_, "you"))
 156       .WillByDefault(Return('a'));
 157
 158   EXPECT_CALL(foo, Bar(0))
 159       .Times(AtMost(3));
 160   EXPECT_CALL(foo, Baz(_, _));
 161   EXPECT_CALL(foo, Baz("hi", "you"))
 162       .WillOnce(Return('z'))
 163       .WillRepeatedly(DoDefault());
 164
 165   EXPECT_EQ(1, foo.Bar(0));
 166   EXPECT_EQ(1, foo.Bar(0));
 167   EXPECT_EQ('z', foo.Baz("hi", "you"));
 168   EXPECT_EQ('a', foo.Baz("hi", "you"));
 169   EXPECT_EQ('b', foo.Baz("hi", "me"));
 170 }
 171
 172 // Tests invoking methods of the same mock object in multiple threads.
 173
 174 struct Helper1Param {
 175   MockFoo* mock_foo;
 176   int* count;
 177 };
 178
 179 void Helper1(Helper1Param param) {
 180   for (int i = 0; i < kRepeat; i++) {
 181     const char ch = param.mock_foo->Baz("a", "b");
 182     if (ch == 'a') {
 183       // It was an expected call.
 184       (*param.count)++;
 185     } else {
 186       // It was an excessive call.
 187       EXPECT_EQ('\0', ch);
 188     }
 189
 190     // An unexpected call.
 191     EXPECT_EQ('\0', param.mock_foo->Baz("x", "y")) << "Expected failure.";
 192
 193     // An uninteresting call.
 194     EXPECT_EQ(1, param.mock_foo->Bar(5));
 195   }
 196 }
 197
 198 // This should generate 3*kRepeat + 1 failures in total.
 199 void TestConcurrentCallsOnSameObject(Dummy /* dummy */) {
 200   MockFoo foo;
 201
 202   ON_CALL(foo, Bar(_))
 203       .WillByDefault(Return(1));
 204   EXPECT_CALL(foo, Baz(_, "b"))
 205       .Times(kRepeat)
 206       .WillRepeatedly(Return('a'));
 207   EXPECT_CALL(foo, Baz(_, "c"));  // Expected to be unsatisfied.
 208
 209   // This chunk of code should generate kRepeat failures about
 210   // excessive calls, and 2*kRepeat failures about unexpected calls.
 211   int count1 = 0;
 212   const Helper1Param param = { &foo, &count1 };
 213   ThreadWithParam<Helper1Param>* const t =
 214       new ThreadWithParam<Helper1Param>(Helper1, param, NULL);
 215
 216   int count2 = 0;
 217   const Helper1Param param2 = { &foo, &count2 };
 218   Helper1(param2);
 219   JoinAndDelete(t);
 220
 221   EXPECT_EQ(kRepeat, count1 + count2);
 222
 223   // foo's destructor should generate one failure about unsatisfied
 224   // expectation.
 225 }
 226
 227 // Tests using the same mock object in multiple threads when the
 228 // expectations are partially ordered.
 229
 230 void Helper2(MockFoo* foo) {
 231   for (int i = 0; i < kRepeat; i++) {
 232     foo->Bar(2);
 233     foo->Bar(3);
 234   }
 235 }
 236
 237 // This should generate no Google Test failures.
 238 void TestPartiallyOrderedExpectationsWithThreads(Dummy /* dummy */) {
 239   MockFoo foo;
 240   Sequence s1, s2;
 241
 242   {
 243     InSequence dummy;
 244     EXPECT_CALL(foo, Bar(0));
 245     EXPECT_CALL(foo, Bar(1))
 246         .InSequence(s1, s2);
 247   }
 248
 249   EXPECT_CALL(foo, Bar(2))
 250       .Times(2*kRepeat)
 251       .InSequence(s1)
 252       .RetiresOnSaturation();
 253   EXPECT_CALL(foo, Bar(3))
 254       .Times(2*kRepeat)
 255       .InSequence(s2);
 256
 257   {
 258     InSequence dummy;
 259     EXPECT_CALL(foo, Bar(2))
 260         .InSequence(s1, s2);
 261     EXPECT_CALL(foo, Bar(4));
 262   }
 263
 264   foo.Bar(0);
 265   foo.Bar(1);
 266
 267   ThreadWithParam<MockFoo*>* const t =
 268       new ThreadWithParam<MockFoo*>(Helper2, &foo, NULL);
 269   Helper2(&foo);
 270   JoinAndDelete(t);
 271
 272   foo.Bar(2);
 273   foo.Bar(4);
 274 }
 275
 276 // Tests using Google Mock constructs in many threads concurrently.
 277 TEST(StressTest, CanUseGMockWithThreads) {
 278   void (*test_routines[])(Dummy dummy) = {
 279     &TestConcurrentCopyAndReadLinkedPtr,
 280     &TestConcurrentWriteToEqualLinkedPtr,
 281     &TestConcurrentMockObjects,
 282     &TestConcurrentCallsOnSameObject,
 283     &TestPartiallyOrderedExpectationsWithThreads,
 284   };
 285
 286   const int kRoutines = sizeof(test_routines)/sizeof(test_routines[0]);
 287   const int kCopiesOfEachRoutine = kMaxTestThreads / kRoutines;
 288   const int kTestThreads = kCopiesOfEachRoutine * kRoutines;
 289   ThreadWithParam<Dummy>* threads[kTestThreads] = {};
 290   for (int i = 0; i < kTestThreads; i++) {
 291     // Creates a thread to run the test function.
 292     threads[i] =
 293         new ThreadWithParam<Dummy>(test_routines[i % kRoutines], Dummy(), NULL);
 294     GTEST_LOG_(INFO) << "Thread #" << i << " running . . .";
 295   }
 296
 297   // At this point, we have many threads running.
 298   for (int i = 0; i < kTestThreads; i++) {
 299     JoinAndDelete(threads[i]);
 300   }
 301
 302   // Ensures that the correct number of failures have been reported.
 303   const TestInfo* const info = UnitTest::GetInstance()->current_test_info();
 304   const TestResult& result = *info->result();
 305   const int kExpectedFailures = (3*kRepeat + 1)*kCopiesOfEachRoutine;
 306   GTEST_CHECK_(kExpectedFailures == result.total_part_count())
 307       << "Expected " << kExpectedFailures << " failures, but got "
 308       << result.total_part_count();
 309 }
 310
 311 }  // namespace
 312 }  // namespace testing
 313
 314 int main(int argc, char **argv) {
 315   testing::InitGoogleMock(&argc, argv);
 316
 317   const int exit_code = RUN_ALL_TESTS();  // Expected to fail.
 318   GTEST_CHECK_(exit_code != 0) << "RUN_ALL_TESTS() did not fail as expected";
 319
 320   printf("\nPASS\n");
 321   return 0;
 322 }