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google/googletest/dist/googletest/samples/sample8_unittest.cc
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// Copyright 2008 Google Inc. | |||||
// All Rights Reserved. | |||||
// | |||||
// Redistribution and use in source and binary forms, with or without | |||||
// modification, are permitted provided that the following conditions are | |||||
// met: | |||||
// | |||||
// * Redistributions of source code must retain the above copyright | |||||
// notice, this list of conditions and the following disclaimer. | |||||
// * Redistributions in binary form must reproduce the above | |||||
// copyright notice, this list of conditions and the following disclaimer | |||||
// in the documentation and/or other materials provided with the | |||||
// distribution. | |||||
// * Neither the name of Google Inc. nor the names of its | |||||
// contributors may be used to endorse or promote products derived from | |||||
// this software without specific prior written permission. | |||||
// | |||||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |||||
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |||||
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |||||
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |||||
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |||||
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |||||
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |||||
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |||||
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |||||
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |||||
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |||||
// This sample shows how to test code relying on some global flag variables. | |||||
// Combine() helps with generating all possible combinations of such flags, | |||||
// and each test is given one combination as a parameter. | |||||
// Use class definitions to test from this header. | |||||
#include "prime_tables.h" | |||||
#include "gtest/gtest.h" | |||||
namespace { | |||||
#if GTEST_HAS_COMBINE | |||||
// Suppose we want to introduce a new, improved implementation of PrimeTable | |||||
// which combines speed of PrecalcPrimeTable and versatility of | |||||
// OnTheFlyPrimeTable (see prime_tables.h). Inside it instantiates both | |||||
// PrecalcPrimeTable and OnTheFlyPrimeTable and uses the one that is more | |||||
// appropriate under the circumstances. But in low memory conditions, it can be | |||||
// told to instantiate without PrecalcPrimeTable instance at all and use only | |||||
// OnTheFlyPrimeTable. | |||||
class HybridPrimeTable : public PrimeTable { | |||||
public: | |||||
HybridPrimeTable(bool force_on_the_fly, int max_precalculated) | |||||
: on_the_fly_impl_(new OnTheFlyPrimeTable), | |||||
precalc_impl_(force_on_the_fly ? NULL : | |||||
new PreCalculatedPrimeTable(max_precalculated)), | |||||
max_precalculated_(max_precalculated) {} | |||||
virtual ~HybridPrimeTable() { | |||||
delete on_the_fly_impl_; | |||||
delete precalc_impl_; | |||||
} | |||||
virtual bool IsPrime(int n) const { | |||||
if (precalc_impl_ != NULL && n < max_precalculated_) | |||||
return precalc_impl_->IsPrime(n); | |||||
else | |||||
return on_the_fly_impl_->IsPrime(n); | |||||
} | |||||
virtual int GetNextPrime(int p) const { | |||||
int next_prime = -1; | |||||
if (precalc_impl_ != NULL && p < max_precalculated_) | |||||
next_prime = precalc_impl_->GetNextPrime(p); | |||||
return next_prime != -1 ? next_prime : on_the_fly_impl_->GetNextPrime(p); | |||||
} | |||||
private: | |||||
OnTheFlyPrimeTable* on_the_fly_impl_; | |||||
PreCalculatedPrimeTable* precalc_impl_; | |||||
int max_precalculated_; | |||||
}; | |||||
using ::testing::TestWithParam; | |||||
using ::testing::Bool; | |||||
using ::testing::Values; | |||||
using ::testing::Combine; | |||||
// To test all code paths for HybridPrimeTable we must test it with numbers | |||||
// both within and outside PreCalculatedPrimeTable's capacity and also with | |||||
// PreCalculatedPrimeTable disabled. We do this by defining fixture which will | |||||
// accept different combinations of parameters for instantiating a | |||||
// HybridPrimeTable instance. | |||||
class PrimeTableTest : public TestWithParam< ::testing::tuple<bool, int> > { | |||||
protected: | |||||
virtual void SetUp() { | |||||
// This can be written as | |||||
// | |||||
// bool force_on_the_fly; | |||||
// int max_precalculated; | |||||
// tie(force_on_the_fly, max_precalculated) = GetParam(); | |||||
// | |||||
// once the Google C++ Style Guide allows use of ::std::tr1::tie. | |||||
// | |||||
bool force_on_the_fly = ::testing::get<0>(GetParam()); | |||||
int max_precalculated = ::testing::get<1>(GetParam()); | |||||
table_ = new HybridPrimeTable(force_on_the_fly, max_precalculated); | |||||
} | |||||
virtual void TearDown() { | |||||
delete table_; | |||||
table_ = NULL; | |||||
} | |||||
HybridPrimeTable* table_; | |||||
}; | |||||
TEST_P(PrimeTableTest, ReturnsFalseForNonPrimes) { | |||||
// Inside the test body, you can refer to the test parameter by GetParam(). | |||||
// In this case, the test parameter is a PrimeTable interface pointer which | |||||
// we can use directly. | |||||
// Please note that you can also save it in the fixture's SetUp() method | |||||
// or constructor and use saved copy in the tests. | |||||
EXPECT_FALSE(table_->IsPrime(-5)); | |||||
EXPECT_FALSE(table_->IsPrime(0)); | |||||
EXPECT_FALSE(table_->IsPrime(1)); | |||||
EXPECT_FALSE(table_->IsPrime(4)); | |||||
EXPECT_FALSE(table_->IsPrime(6)); | |||||
EXPECT_FALSE(table_->IsPrime(100)); | |||||
} | |||||
TEST_P(PrimeTableTest, ReturnsTrueForPrimes) { | |||||
EXPECT_TRUE(table_->IsPrime(2)); | |||||
EXPECT_TRUE(table_->IsPrime(3)); | |||||
EXPECT_TRUE(table_->IsPrime(5)); | |||||
EXPECT_TRUE(table_->IsPrime(7)); | |||||
EXPECT_TRUE(table_->IsPrime(11)); | |||||
EXPECT_TRUE(table_->IsPrime(131)); | |||||
} | |||||
TEST_P(PrimeTableTest, CanGetNextPrime) { | |||||
EXPECT_EQ(2, table_->GetNextPrime(0)); | |||||
EXPECT_EQ(3, table_->GetNextPrime(2)); | |||||
EXPECT_EQ(5, table_->GetNextPrime(3)); | |||||
EXPECT_EQ(7, table_->GetNextPrime(5)); | |||||
EXPECT_EQ(11, table_->GetNextPrime(7)); | |||||
EXPECT_EQ(131, table_->GetNextPrime(128)); | |||||
} | |||||
// In order to run value-parameterized tests, you need to instantiate them, | |||||
// or bind them to a list of values which will be used as test parameters. | |||||
// You can instantiate them in a different translation module, or even | |||||
// instantiate them several times. | |||||
// | |||||
// Here, we instantiate our tests with a list of parameters. We must combine | |||||
// all variations of the boolean flag suppressing PrecalcPrimeTable and some | |||||
// meaningful values for tests. We choose a small value (1), and a value that | |||||
// will put some of the tested numbers beyond the capability of the | |||||
// PrecalcPrimeTable instance and some inside it (10). Combine will produce all | |||||
// possible combinations. | |||||
INSTANTIATE_TEST_CASE_P(MeaningfulTestParameters, | |||||
PrimeTableTest, | |||||
Combine(Bool(), Values(1, 10))); | |||||
#else | |||||
// Google Test may not support Combine() with some compilers. If we | |||||
// use conditional compilation to compile out all code referring to | |||||
// the gtest_main library, MSVC linker will not link that library at | |||||
// all and consequently complain about missing entry point defined in | |||||
// that library (fatal error LNK1561: entry point must be | |||||
// defined). This dummy test keeps gtest_main linked in. | |||||
TEST(DummyTest, CombineIsNotSupportedOnThisPlatform) {} | |||||
#endif // GTEST_HAS_COMBINE | |||||
} // namespace |