174 lines
6.8 KiB
C++
174 lines
6.8 KiB
C++
// Copyright 2008 Google Inc.
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// All Rights Reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: vladl@google.com (Vlad Losev)
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// This sample shows how to test code relying on some global flag variables.
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// Combine() helps with generating all possible combinations of such flags,
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// and each test is given one combination as a parameter.
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// Use class definitions to test from this header.
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#include "prime_tables.h"
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#include <gtest/gtest.h>
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#if GTEST_HAS_COMBINE
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// Suppose we want to introduce a new, improved implementation of PrimeTable
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// which combines speed of PrecalcPrimeTable and versatility of
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// OnTheFlyPrimeTable (see prime_tables.h). Inside it instantiates both
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// PrecalcPrimeTable and OnTheFlyPrimeTable and uses the one that is more
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// appropriate under the circumstances. But in low memory conditions, it can be
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// told to instantiate without PrecalcPrimeTable instance at all and use only
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// OnTheFlyPrimeTable.
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class HybridPrimeTable : public PrimeTable {
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public:
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HybridPrimeTable(bool force_on_the_fly, int max_precalculated)
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: on_the_fly_impl_(new OnTheFlyPrimeTable),
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precalc_impl_(force_on_the_fly ? NULL :
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new PreCalculatedPrimeTable(max_precalculated)),
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max_precalculated_(max_precalculated) {}
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virtual ~HybridPrimeTable() {
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delete on_the_fly_impl_;
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delete precalc_impl_;
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}
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virtual bool IsPrime(int n) const {
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if (precalc_impl_ != NULL && n < max_precalculated_)
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return precalc_impl_->IsPrime(n);
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else
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return on_the_fly_impl_->IsPrime(n);
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}
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virtual int GetNextPrime(int p) const {
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int next_prime = -1;
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if (precalc_impl_ != NULL && p < max_precalculated_)
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next_prime = precalc_impl_->GetNextPrime(p);
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return next_prime != -1 ? next_prime : on_the_fly_impl_->GetNextPrime(p);
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}
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private:
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OnTheFlyPrimeTable* on_the_fly_impl_;
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PreCalculatedPrimeTable* precalc_impl_;
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int max_precalculated_;
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};
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using ::testing::TestWithParam;
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using ::testing::Bool;
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using ::testing::Values;
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using ::testing::Combine;
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// To test all code paths for HybridPrimeTable we must test it with numbers
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// both within and outside PreCalculatedPrimeTable's capacity and also with
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// PreCalculatedPrimeTable disabled. We do this by defining fixture which will
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// accept different combinations of parameters for instantiating a
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// HybridPrimeTable instance.
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class PrimeTableTest : public TestWithParam< ::std::tr1::tuple<bool, int> > {
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protected:
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virtual void SetUp() {
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// This can be written as
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//
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// bool force_on_the_fly;
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// int max_precalculated;
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// tie(force_on_the_fly, max_precalculated) = GetParam();
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//
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// once the Google C++ Style Guide allows use of ::std::tr1::tie.
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//
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bool force_on_the_fly = ::std::tr1::get<0>(GetParam());
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int max_precalculated = ::std::tr1::get<1>(GetParam());
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table_ = new HybridPrimeTable(force_on_the_fly, max_precalculated);
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}
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virtual void TearDown() {
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delete table_;
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table_ = NULL;
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}
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HybridPrimeTable* table_;
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};
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TEST_P(PrimeTableTest, ReturnsFalseForNonPrimes) {
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// Inside the test body, you can refer to the test parameter by GetParam().
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// In this case, the test parameter is a PrimeTable interface pointer which
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// we can use directly.
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// Please note that you can also save it in the fixture's SetUp() method
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// or constructor and use saved copy in the tests.
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EXPECT_FALSE(table_->IsPrime(-5));
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EXPECT_FALSE(table_->IsPrime(0));
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EXPECT_FALSE(table_->IsPrime(1));
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EXPECT_FALSE(table_->IsPrime(4));
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EXPECT_FALSE(table_->IsPrime(6));
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EXPECT_FALSE(table_->IsPrime(100));
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}
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TEST_P(PrimeTableTest, ReturnsTrueForPrimes) {
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EXPECT_TRUE(table_->IsPrime(2));
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EXPECT_TRUE(table_->IsPrime(3));
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EXPECT_TRUE(table_->IsPrime(5));
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EXPECT_TRUE(table_->IsPrime(7));
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EXPECT_TRUE(table_->IsPrime(11));
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EXPECT_TRUE(table_->IsPrime(131));
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}
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TEST_P(PrimeTableTest, CanGetNextPrime) {
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EXPECT_EQ(2, table_->GetNextPrime(0));
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EXPECT_EQ(3, table_->GetNextPrime(2));
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EXPECT_EQ(5, table_->GetNextPrime(3));
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EXPECT_EQ(7, table_->GetNextPrime(5));
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EXPECT_EQ(11, table_->GetNextPrime(7));
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EXPECT_EQ(131, table_->GetNextPrime(128));
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}
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// In order to run value-parameterized tests, you need to instantiate them,
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// or bind them to a list of values which will be used as test parameters.
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// You can instantiate them in a different translation module, or even
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// instantiate them several times.
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//
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// Here, we instantiate our tests with a list of parameters. We must combine
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// all variations of the boolean flag suppressing PrecalcPrimeTable and some
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// meaningful values for tests. We choose a small value (1), and a value that
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// will put some of the tested numbers beyond the capability of the
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// PrecalcPrimeTable instance and some inside it (10). Combine will produce all
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// possible combinations.
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INSTANTIATE_TEST_CASE_P(MeaningfulTestParameters,
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PrimeTableTest,
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Combine(Bool(), Values(1, 10)));
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#else
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// Google Test doesn't support Combine() on some platforms and compilers,
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// such as MSVC 7.1. If we use conditional compilation to compile out
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// all code referring to the gtest_main library, MSVC linker will not
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// link that library at all and consequently complain about missing entry
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// point defined in that library (fatal error LNK1561: entry point must
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// be defined). This dummy test keeps gtest_main linked in.
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TEST(DummyTest, CombineIsNotSupportedOnThisPlatform) {}
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#endif // GTEST_HAS_COMBINE
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