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1.4 +// Copyright 2008 Google Inc.
1.5 +// All Rights Reserved.
1.6 +//
1.7 +// Redistribution and use in source and binary forms, with or without
1.8 +// modification, are permitted provided that the following conditions are
1.9 +// met:
1.10 +//
1.11 +// * Redistributions of source code must retain the above copyright
1.12 +// notice, this list of conditions and the following disclaimer.
1.13 +// * Redistributions in binary form must reproduce the above
1.14 +// copyright notice, this list of conditions and the following disclaimer
1.15 +// in the documentation and/or other materials provided with the
1.16 +// distribution.
1.17 +// * Neither the name of Google Inc. nor the names of its
1.18 +// contributors may be used to endorse or promote products derived from
1.19 +// this software without specific prior written permission.
1.20 +//
1.21 +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.22 +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.23 +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.24 +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
1.25 +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
1.26 +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
1.27 +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.28 +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.29 +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.30 +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
1.31 +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 +//
1.33 +// Author: wan@google.com (Zhanyong Wan)
1.34 +
1.35 +// This sample shows how to test common properties of multiple
1.36 +// implementations of the same interface (aka interface tests).
1.37 +
1.38 +// The interface and its implementations are in this header.
1.39 +#include "prime_tables.h"
1.40 +
1.41 +#include "gtest/gtest.h"
1.42 +
1.43 +// First, we define some factory functions for creating instances of
1.44 +// the implementations. You may be able to skip this step if all your
1.45 +// implementations can be constructed the same way.
1.46 +
1.47 +template <class T>
1.48 +PrimeTable* CreatePrimeTable();
1.49 +
1.50 +template <>
1.51 +PrimeTable* CreatePrimeTable<OnTheFlyPrimeTable>() {
1.52 + return new OnTheFlyPrimeTable;
1.53 +}
1.54 +
1.55 +template <>
1.56 +PrimeTable* CreatePrimeTable<PreCalculatedPrimeTable>() {
1.57 + return new PreCalculatedPrimeTable(10000);
1.58 +}
1.59 +
1.60 +// Then we define a test fixture class template.
1.61 +template <class T>
1.62 +class PrimeTableTest : public testing::Test {
1.63 + protected:
1.64 + // The ctor calls the factory function to create a prime table
1.65 + // implemented by T.
1.66 + PrimeTableTest() : table_(CreatePrimeTable<T>()) {}
1.67 +
1.68 + virtual ~PrimeTableTest() { delete table_; }
1.69 +
1.70 + // Note that we test an implementation via the base interface
1.71 + // instead of the actual implementation class. This is important
1.72 + // for keeping the tests close to the real world scenario, where the
1.73 + // implementation is invoked via the base interface. It avoids
1.74 + // got-yas where the implementation class has a method that shadows
1.75 + // a method with the same name (but slightly different argument
1.76 + // types) in the base interface, for example.
1.77 + PrimeTable* const table_;
1.78 +};
1.79 +
1.80 +#if GTEST_HAS_TYPED_TEST
1.81 +
1.82 +using testing::Types;
1.83 +
1.84 +// Google Test offers two ways for reusing tests for different types.
1.85 +// The first is called "typed tests". You should use it if you
1.86 +// already know *all* the types you are gonna exercise when you write
1.87 +// the tests.
1.88 +
1.89 +// To write a typed test case, first use
1.90 +//
1.91 +// TYPED_TEST_CASE(TestCaseName, TypeList);
1.92 +//
1.93 +// to declare it and specify the type parameters. As with TEST_F,
1.94 +// TestCaseName must match the test fixture name.
1.95 +
1.96 +// The list of types we want to test.
1.97 +typedef Types<OnTheFlyPrimeTable, PreCalculatedPrimeTable> Implementations;
1.98 +
1.99 +TYPED_TEST_CASE(PrimeTableTest, Implementations);
1.100 +
1.101 +// Then use TYPED_TEST(TestCaseName, TestName) to define a typed test,
1.102 +// similar to TEST_F.
1.103 +TYPED_TEST(PrimeTableTest, ReturnsFalseForNonPrimes) {
1.104 + // Inside the test body, you can refer to the type parameter by
1.105 + // TypeParam, and refer to the fixture class by TestFixture. We
1.106 + // don't need them in this example.
1.107 +
1.108 + // Since we are in the template world, C++ requires explicitly
1.109 + // writing 'this->' when referring to members of the fixture class.
1.110 + // This is something you have to learn to live with.
1.111 + EXPECT_FALSE(this->table_->IsPrime(-5));
1.112 + EXPECT_FALSE(this->table_->IsPrime(0));
1.113 + EXPECT_FALSE(this->table_->IsPrime(1));
1.114 + EXPECT_FALSE(this->table_->IsPrime(4));
1.115 + EXPECT_FALSE(this->table_->IsPrime(6));
1.116 + EXPECT_FALSE(this->table_->IsPrime(100));
1.117 +}
1.118 +
1.119 +TYPED_TEST(PrimeTableTest, ReturnsTrueForPrimes) {
1.120 + EXPECT_TRUE(this->table_->IsPrime(2));
1.121 + EXPECT_TRUE(this->table_->IsPrime(3));
1.122 + EXPECT_TRUE(this->table_->IsPrime(5));
1.123 + EXPECT_TRUE(this->table_->IsPrime(7));
1.124 + EXPECT_TRUE(this->table_->IsPrime(11));
1.125 + EXPECT_TRUE(this->table_->IsPrime(131));
1.126 +}
1.127 +
1.128 +TYPED_TEST(PrimeTableTest, CanGetNextPrime) {
1.129 + EXPECT_EQ(2, this->table_->GetNextPrime(0));
1.130 + EXPECT_EQ(3, this->table_->GetNextPrime(2));
1.131 + EXPECT_EQ(5, this->table_->GetNextPrime(3));
1.132 + EXPECT_EQ(7, this->table_->GetNextPrime(5));
1.133 + EXPECT_EQ(11, this->table_->GetNextPrime(7));
1.134 + EXPECT_EQ(131, this->table_->GetNextPrime(128));
1.135 +}
1.136 +
1.137 +// That's it! Google Test will repeat each TYPED_TEST for each type
1.138 +// in the type list specified in TYPED_TEST_CASE. Sit back and be
1.139 +// happy that you don't have to define them multiple times.
1.140 +
1.141 +#endif // GTEST_HAS_TYPED_TEST
1.142 +
1.143 +#if GTEST_HAS_TYPED_TEST_P
1.144 +
1.145 +using testing::Types;
1.146 +
1.147 +// Sometimes, however, you don't yet know all the types that you want
1.148 +// to test when you write the tests. For example, if you are the
1.149 +// author of an interface and expect other people to implement it, you
1.150 +// might want to write a set of tests to make sure each implementation
1.151 +// conforms to some basic requirements, but you don't know what
1.152 +// implementations will be written in the future.
1.153 +//
1.154 +// How can you write the tests without committing to the type
1.155 +// parameters? That's what "type-parameterized tests" can do for you.
1.156 +// It is a bit more involved than typed tests, but in return you get a
1.157 +// test pattern that can be reused in many contexts, which is a big
1.158 +// win. Here's how you do it:
1.159 +
1.160 +// First, define a test fixture class template. Here we just reuse
1.161 +// the PrimeTableTest fixture defined earlier:
1.162 +
1.163 +template <class T>
1.164 +class PrimeTableTest2 : public PrimeTableTest<T> {
1.165 +};
1.166 +
1.167 +// Then, declare the test case. The argument is the name of the test
1.168 +// fixture, and also the name of the test case (as usual). The _P
1.169 +// suffix is for "parameterized" or "pattern".
1.170 +TYPED_TEST_CASE_P(PrimeTableTest2);
1.171 +
1.172 +// Next, use TYPED_TEST_P(TestCaseName, TestName) to define a test,
1.173 +// similar to what you do with TEST_F.
1.174 +TYPED_TEST_P(PrimeTableTest2, ReturnsFalseForNonPrimes) {
1.175 + EXPECT_FALSE(this->table_->IsPrime(-5));
1.176 + EXPECT_FALSE(this->table_->IsPrime(0));
1.177 + EXPECT_FALSE(this->table_->IsPrime(1));
1.178 + EXPECT_FALSE(this->table_->IsPrime(4));
1.179 + EXPECT_FALSE(this->table_->IsPrime(6));
1.180 + EXPECT_FALSE(this->table_->IsPrime(100));
1.181 +}
1.182 +
1.183 +TYPED_TEST_P(PrimeTableTest2, ReturnsTrueForPrimes) {
1.184 + EXPECT_TRUE(this->table_->IsPrime(2));
1.185 + EXPECT_TRUE(this->table_->IsPrime(3));
1.186 + EXPECT_TRUE(this->table_->IsPrime(5));
1.187 + EXPECT_TRUE(this->table_->IsPrime(7));
1.188 + EXPECT_TRUE(this->table_->IsPrime(11));
1.189 + EXPECT_TRUE(this->table_->IsPrime(131));
1.190 +}
1.191 +
1.192 +TYPED_TEST_P(PrimeTableTest2, CanGetNextPrime) {
1.193 + EXPECT_EQ(2, this->table_->GetNextPrime(0));
1.194 + EXPECT_EQ(3, this->table_->GetNextPrime(2));
1.195 + EXPECT_EQ(5, this->table_->GetNextPrime(3));
1.196 + EXPECT_EQ(7, this->table_->GetNextPrime(5));
1.197 + EXPECT_EQ(11, this->table_->GetNextPrime(7));
1.198 + EXPECT_EQ(131, this->table_->GetNextPrime(128));
1.199 +}
1.200 +
1.201 +// Type-parameterized tests involve one extra step: you have to
1.202 +// enumerate the tests you defined:
1.203 +REGISTER_TYPED_TEST_CASE_P(
1.204 + PrimeTableTest2, // The first argument is the test case name.
1.205 + // The rest of the arguments are the test names.
1.206 + ReturnsFalseForNonPrimes, ReturnsTrueForPrimes, CanGetNextPrime);
1.207 +
1.208 +// At this point the test pattern is done. However, you don't have
1.209 +// any real test yet as you haven't said which types you want to run
1.210 +// the tests with.
1.211 +
1.212 +// To turn the abstract test pattern into real tests, you instantiate
1.213 +// it with a list of types. Usually the test pattern will be defined
1.214 +// in a .h file, and anyone can #include and instantiate it. You can
1.215 +// even instantiate it more than once in the same program. To tell
1.216 +// different instances apart, you give each of them a name, which will
1.217 +// become part of the test case name and can be used in test filters.
1.218 +
1.219 +// The list of types we want to test. Note that it doesn't have to be
1.220 +// defined at the time we write the TYPED_TEST_P()s.
1.221 +typedef Types<OnTheFlyPrimeTable, PreCalculatedPrimeTable>
1.222 + PrimeTableImplementations;
1.223 +INSTANTIATE_TYPED_TEST_CASE_P(OnTheFlyAndPreCalculated, // Instance name
1.224 + PrimeTableTest2, // Test case name
1.225 + PrimeTableImplementations); // Type list
1.226 +
1.227 +#endif // GTEST_HAS_TYPED_TEST_P
