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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.
-//
-// 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"
-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