main.cpp

#include <gtest/gtest.h>
#include <rapidcheck/gtest.h>

// Should succeed:
RC_GTEST_PROP(MyTestCase,
              copyOfStringIsIdenticalToOriginal,
              (const std::string &str)) {
  RC_CLASSIFY(str.empty());
  const auto strCopy = str;
  RC_ASSERT(strCopy == str);
}

// Should obviously fail:
RC_GTEST_PROP(MyTestCase, dividingByTenMakesAllNumbersEqual, (int a, int b)) {
  RC_ASSERT((a / 10) == (b / 10));
}

// If you don't have any arguments, you have to have an empty paren:
RC_GTEST_PROP(MyTestCase, inRangeValueIsInRange, ()) {
  const auto range = *rc::gen::arbitrary<std::pair<int, int>>();
  const auto x = *rc::gen::inRange(range.first, range.second);
  RC_ASSERT(x >= range.first);
  RC_ASSERT(x < range.second);
}

// You can also create fixtures...
class MyFixture : public ::testing::Test {
protected:
  MyFixture()
      : counter(0) {}

  void SetUp() override {
    // SetUp works as usual...
  }

  void increment() { counter++; }

  void TearDown() override {
    // ...as does TearDown
  }

  std::size_t counter;
};

// ...and use them like this:
RC_GTEST_FIXTURE_PROP(MyFixture,
                      shouldInstantiateFixtureOnEachRun,
                      (const std::vector<int> &ints)) {
  for (std::size_t i = 0; i < ints.size(); i++) {
    increment();
  }

  RC_ASSERT(counter == ints.size());
}

// A normal Google test can use the same fixture:
TEST_F(MyFixture, incrementIncrementsByOne) {
  ASSERT_EQ(0U, counter);
  increment();
  ASSERT_EQ(1U, counter);
}

// Typed test fixtures are also supported:
template <typename TypeParam>
class MyTypedFixture : public ::testing::Test {
protected:
  void add(const TypeParam x) { sum += x; }

  TypeParam sum{};
};

// A typed suite can be defined as usual ...
using TestTypes = ::testing::Types<unsigned, float, double>;
TYPED_TEST_SUITE(MyTypedFixture, TestTypes, );

// ... and used with properties ...
RC_GTEST_TYPED_FIXTURE_PROP(MyTypedFixture,
                            typeParameterizedProperty,
                            (TypeParam a, TypeParam b)) {
  this->add(a);
  this->add(b);
  RC_ASSERT(this->sum == (a + b));
}

// ...as with regular typed tests:
TYPED_TEST(MyTypedFixture, test) {
  const auto a = static_cast<TypeParam>(10);
  const auto b = static_cast<TypeParam>(20);
  this->add(a);
  this->add(b);
  ASSERT_EQ(this->sum, a + b);
}

int main(int argc, char **argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}