--- /dev/null
+// 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
Code Review / ric-plt / sdl.git / blobdiff