diff options
Diffstat (limited to 'media/webrtc/trunk/testing/gtest/samples/sample8_unittest.cc')
-rw-r--r-- | media/webrtc/trunk/testing/gtest/samples/sample8_unittest.cc | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/media/webrtc/trunk/testing/gtest/samples/sample8_unittest.cc b/media/webrtc/trunk/testing/gtest/samples/sample8_unittest.cc new file mode 100644 index 000000000..5ad2e2c9f --- /dev/null +++ b/media/webrtc/trunk/testing/gtest/samples/sample8_unittest.cc @@ -0,0 +1,173 @@ +// 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. +// +// Author: vladl@google.com (Vlad Losev) + +// 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" + +#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< ::std::tr1::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 = ::std::tr1::get<0>(GetParam()); + int max_precalculated = ::std::tr1::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 |