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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"
+#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

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comparison: media/webrtc/trunk/testing/gtest/samples/sample8_unittest.cc

media/webrtc/trunk/testing/gtest/samples/sample8_unittest.cc