sample8_unittest.cc
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00001 // Copyright 2008 Google Inc.
00002 // All Rights Reserved.
00003 //
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00007 //
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00010 //     * Redistributions in binary form must reproduce the above
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00028 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00029 //
00030 // Author: vladl@google.com (Vlad Losev)
00031 
00032 // This sample shows how to test code relying on some global flag variables.
00033 // Combine() helps with generating all possible combinations of such flags,
00034 // and each test is given one combination as a parameter.
00035 
00036 // Use class definitions to test from this header.
00037 #include "prime_tables.h"
00038 
00039 #include "gtest/gtest.h"
00040 
00041 #if GTEST_HAS_COMBINE
00042 
00043 // Suppose we want to introduce a new, improved implementation of PrimeTable
00044 // which combines speed of PrecalcPrimeTable and versatility of
00045 // OnTheFlyPrimeTable (see prime_tables.h). Inside it instantiates both
00046 // PrecalcPrimeTable and OnTheFlyPrimeTable and uses the one that is more
00047 // appropriate under the circumstances. But in low memory conditions, it can be
00048 // told to instantiate without PrecalcPrimeTable instance at all and use only
00049 // OnTheFlyPrimeTable.
00050 class HybridPrimeTable : public PrimeTable {
00051  public:
00052   HybridPrimeTable(bool force_on_the_fly, int max_precalculated)
00053       : on_the_fly_impl_(new OnTheFlyPrimeTable),
00054         precalc_impl_(force_on_the_fly ? NULL :
00055                           new PreCalculatedPrimeTable(max_precalculated)),
00056         max_precalculated_(max_precalculated) {}
00057   virtual ~HybridPrimeTable() {
00058     delete on_the_fly_impl_;
00059     delete precalc_impl_;
00060   }
00061 
00062   virtual bool IsPrime(int n) const {
00063     if (precalc_impl_ != NULL && n < max_precalculated_)
00064       return precalc_impl_->IsPrime(n);
00065     else
00066       return on_the_fly_impl_->IsPrime(n);
00067   }
00068 
00069   virtual int GetNextPrime(int p) const {
00070     int next_prime = -1;
00071     if (precalc_impl_ != NULL && p < max_precalculated_)
00072       next_prime = precalc_impl_->GetNextPrime(p);
00073 
00074     return next_prime != -1 ? next_prime : on_the_fly_impl_->GetNextPrime(p);
00075   }
00076 
00077  private:
00078   OnTheFlyPrimeTable* on_the_fly_impl_;
00079   PreCalculatedPrimeTable* precalc_impl_;
00080   int max_precalculated_;
00081 };
00082 
00083 using ::testing::TestWithParam;
00084 using ::testing::Bool;
00085 using ::testing::Values;
00086 using ::testing::Combine;
00087 
00088 // To test all code paths for HybridPrimeTable we must test it with numbers
00089 // both within and outside PreCalculatedPrimeTable's capacity and also with
00090 // PreCalculatedPrimeTable disabled. We do this by defining fixture which will
00091 // accept different combinations of parameters for instantiating a
00092 // HybridPrimeTable instance.
00093 class PrimeTableTest : public TestWithParam< ::testing::tuple<bool, int> > {
00094  protected:
00095   virtual void SetUp() {
00096     // This can be written as
00097     //
00098     // bool force_on_the_fly;
00099     // int max_precalculated;
00100     // tie(force_on_the_fly, max_precalculated) = GetParam();
00101     //
00102     // once the Google C++ Style Guide allows use of ::std::tr1::tie.
00103     //
00104     bool force_on_the_fly = ::testing::get<0>(GetParam());
00105     int max_precalculated = ::testing::get<1>(GetParam());
00106     table_ = new HybridPrimeTable(force_on_the_fly, max_precalculated);
00107   }
00108   virtual void TearDown() {
00109     delete table_;
00110     table_ = NULL;
00111   }
00112   HybridPrimeTable* table_;
00113 };
00114 
00115 TEST_P(PrimeTableTest, ReturnsFalseForNonPrimes) {
00116   // Inside the test body, you can refer to the test parameter by GetParam().
00117   // In this case, the test parameter is a PrimeTable interface pointer which
00118   // we can use directly.
00119   // Please note that you can also save it in the fixture's SetUp() method
00120   // or constructor and use saved copy in the tests.
00121 
00122   EXPECT_FALSE(table_->IsPrime(-5));
00123   EXPECT_FALSE(table_->IsPrime(0));
00124   EXPECT_FALSE(table_->IsPrime(1));
00125   EXPECT_FALSE(table_->IsPrime(4));
00126   EXPECT_FALSE(table_->IsPrime(6));
00127   EXPECT_FALSE(table_->IsPrime(100));
00128 }
00129 
00130 TEST_P(PrimeTableTest, ReturnsTrueForPrimes) {
00131   EXPECT_TRUE(table_->IsPrime(2));
00132   EXPECT_TRUE(table_->IsPrime(3));
00133   EXPECT_TRUE(table_->IsPrime(5));
00134   EXPECT_TRUE(table_->IsPrime(7));
00135   EXPECT_TRUE(table_->IsPrime(11));
00136   EXPECT_TRUE(table_->IsPrime(131));
00137 }
00138 
00139 TEST_P(PrimeTableTest, CanGetNextPrime) {
00140   EXPECT_EQ(2, table_->GetNextPrime(0));
00141   EXPECT_EQ(3, table_->GetNextPrime(2));
00142   EXPECT_EQ(5, table_->GetNextPrime(3));
00143   EXPECT_EQ(7, table_->GetNextPrime(5));
00144   EXPECT_EQ(11, table_->GetNextPrime(7));
00145   EXPECT_EQ(131, table_->GetNextPrime(128));
00146 }
00147 
00148 // In order to run value-parameterized tests, you need to instantiate them,
00149 // or bind them to a list of values which will be used as test parameters.
00150 // You can instantiate them in a different translation module, or even
00151 // instantiate them several times.
00152 //
00153 // Here, we instantiate our tests with a list of parameters. We must combine
00154 // all variations of the boolean flag suppressing PrecalcPrimeTable and some
00155 // meaningful values for tests. We choose a small value (1), and a value that
00156 // will put some of the tested numbers beyond the capability of the
00157 // PrecalcPrimeTable instance and some inside it (10). Combine will produce all
00158 // possible combinations.
00159 INSTANTIATE_TEST_CASE_P(MeaningfulTestParameters,
00160                         PrimeTableTest,
00161                         Combine(Bool(), Values(1, 10)));
00162 
00163 #else
00164 
00165 // Google Test may not support Combine() with some compilers. If we
00166 // use conditional compilation to compile out all code referring to
00167 // the gtest_main library, MSVC linker will not link that library at
00168 // all and consequently complain about missing entry point defined in
00169 // that library (fatal error LNK1561: entry point must be
00170 // defined). This dummy test keeps gtest_main linked in.
00171 TEST(DummyTest, CombineIsNotSupportedOnThisPlatform) {}
00172 
00173 #endif  // GTEST_HAS_COMBINE


rc_visard_driver
Author(s): Heiko Hirschmueller , Christian Emmerich , Felix Ruess
autogenerated on Thu Jun 6 2019 20:43:06