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225 lines
8.8 KiB
C++
225 lines
8.8 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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// This sample shows how to test common properties of multiple
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// implementations of the same interface (aka interface tests).
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// The interface and its implementations are in this header.
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#include "prime_tables.h"
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#include "gtest/gtest.h"
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namespace {
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// First, we define some factory functions for creating instances of
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// the implementations. You may be able to skip this step if all your
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// implementations can be constructed the same way.
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template <class T>
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PrimeTable* CreatePrimeTable();
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template <>
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PrimeTable* CreatePrimeTable<OnTheFlyPrimeTable>() {
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return new OnTheFlyPrimeTable;
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}
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template <>
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PrimeTable* CreatePrimeTable<PreCalculatedPrimeTable>() {
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return new PreCalculatedPrimeTable(10000);
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}
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// Then we define a test fixture class template.
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template <class T>
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class PrimeTableTest : public testing::Test {
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protected:
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// The ctor calls the factory function to create a prime table
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// implemented by T.
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PrimeTableTest() : table_(CreatePrimeTable<T>()) {}
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~PrimeTableTest() override { delete table_; }
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// Note that we test an implementation via the base interface
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// instead of the actual implementation class. This is important
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// for keeping the tests close to the real world scenario, where the
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// implementation is invoked via the base interface. It avoids
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// got-yas where the implementation class has a method that shadows
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// a method with the same name (but slightly different argument
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// types) in the base interface, for example.
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PrimeTable* const table_;
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};
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#if GTEST_HAS_TYPED_TEST
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using testing::Types;
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// Google Test offers two ways for reusing tests for different types.
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// The first is called "typed tests". You should use it if you
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// already know *all* the types you are gonna exercise when you write
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// the tests.
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// To write a typed test case, first use
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//
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// TYPED_TEST_CASE(TestCaseName, TypeList);
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//
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// to declare it and specify the type parameters. As with TEST_F,
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// TestCaseName must match the test fixture name.
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// The list of types we want to test.
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typedef Types<OnTheFlyPrimeTable, PreCalculatedPrimeTable> Implementations;
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TYPED_TEST_SUITE(PrimeTableTest, Implementations);
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// Then use TYPED_TEST(TestCaseName, TestName) to define a typed test,
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// similar to TEST_F.
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TYPED_TEST(PrimeTableTest, ReturnsFalseForNonPrimes) {
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// Inside the test body, you can refer to the type parameter by
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// TypeParam, and refer to the fixture class by TestFixture. We
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// don't need them in this example.
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// Since we are in the template world, C++ requires explicitly
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// writing 'this->' when referring to members of the fixture class.
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// This is something you have to learn to live with.
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EXPECT_FALSE(this->table_->IsPrime(-5));
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EXPECT_FALSE(this->table_->IsPrime(0));
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EXPECT_FALSE(this->table_->IsPrime(1));
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EXPECT_FALSE(this->table_->IsPrime(4));
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EXPECT_FALSE(this->table_->IsPrime(6));
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EXPECT_FALSE(this->table_->IsPrime(100));
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}
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TYPED_TEST(PrimeTableTest, ReturnsTrueForPrimes) {
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EXPECT_TRUE(this->table_->IsPrime(2));
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EXPECT_TRUE(this->table_->IsPrime(3));
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EXPECT_TRUE(this->table_->IsPrime(5));
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EXPECT_TRUE(this->table_->IsPrime(7));
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EXPECT_TRUE(this->table_->IsPrime(11));
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EXPECT_TRUE(this->table_->IsPrime(131));
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}
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TYPED_TEST(PrimeTableTest, CanGetNextPrime) {
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EXPECT_EQ(2, this->table_->GetNextPrime(0));
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EXPECT_EQ(3, this->table_->GetNextPrime(2));
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EXPECT_EQ(5, this->table_->GetNextPrime(3));
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EXPECT_EQ(7, this->table_->GetNextPrime(5));
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EXPECT_EQ(11, this->table_->GetNextPrime(7));
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EXPECT_EQ(131, this->table_->GetNextPrime(128));
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}
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// That's it! Google Test will repeat each TYPED_TEST for each type
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// in the type list specified in TYPED_TEST_CASE. Sit back and be
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// happy that you don't have to define them multiple times.
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#endif // GTEST_HAS_TYPED_TEST
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#if GTEST_HAS_TYPED_TEST_P
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using testing::Types;
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// Sometimes, however, you don't yet know all the types that you want
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// to test when you write the tests. For example, if you are the
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// author of an interface and expect other people to implement it, you
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// might want to write a set of tests to make sure each implementation
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// conforms to some basic requirements, but you don't know what
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// implementations will be written in the future.
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//
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// How can you write the tests without committing to the type
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// parameters? That's what "type-parameterized tests" can do for you.
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// It is a bit more involved than typed tests, but in return you get a
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// test pattern that can be reused in many contexts, which is a big
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// win. Here's how you do it:
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// First, define a test fixture class template. Here we just reuse
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// the PrimeTableTest fixture defined earlier:
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template <class T>
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class PrimeTableTest2 : public PrimeTableTest<T> {
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};
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// Then, declare the test case. The argument is the name of the test
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// fixture, and also the name of the test case (as usual). The _P
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// suffix is for "parameterized" or "pattern".
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TYPED_TEST_SUITE_P(PrimeTableTest2);
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// Next, use TYPED_TEST_P(TestCaseName, TestName) to define a test,
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// similar to what you do with TEST_F.
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TYPED_TEST_P(PrimeTableTest2, ReturnsFalseForNonPrimes) {
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EXPECT_FALSE(this->table_->IsPrime(-5));
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EXPECT_FALSE(this->table_->IsPrime(0));
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EXPECT_FALSE(this->table_->IsPrime(1));
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EXPECT_FALSE(this->table_->IsPrime(4));
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EXPECT_FALSE(this->table_->IsPrime(6));
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EXPECT_FALSE(this->table_->IsPrime(100));
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}
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TYPED_TEST_P(PrimeTableTest2, ReturnsTrueForPrimes) {
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EXPECT_TRUE(this->table_->IsPrime(2));
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EXPECT_TRUE(this->table_->IsPrime(3));
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EXPECT_TRUE(this->table_->IsPrime(5));
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EXPECT_TRUE(this->table_->IsPrime(7));
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EXPECT_TRUE(this->table_->IsPrime(11));
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EXPECT_TRUE(this->table_->IsPrime(131));
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}
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TYPED_TEST_P(PrimeTableTest2, CanGetNextPrime) {
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EXPECT_EQ(2, this->table_->GetNextPrime(0));
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EXPECT_EQ(3, this->table_->GetNextPrime(2));
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EXPECT_EQ(5, this->table_->GetNextPrime(3));
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EXPECT_EQ(7, this->table_->GetNextPrime(5));
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EXPECT_EQ(11, this->table_->GetNextPrime(7));
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EXPECT_EQ(131, this->table_->GetNextPrime(128));
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}
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// Type-parameterized tests involve one extra step: you have to
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// enumerate the tests you defined:
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REGISTER_TYPED_TEST_SUITE_P(
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PrimeTableTest2, // The first argument is the test case name.
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// The rest of the arguments are the test names.
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ReturnsFalseForNonPrimes, ReturnsTrueForPrimes, CanGetNextPrime);
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// At this point the test pattern is done. However, you don't have
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// any real test yet as you haven't said which types you want to run
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// the tests with.
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// To turn the abstract test pattern into real tests, you instantiate
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// it with a list of types. Usually the test pattern will be defined
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// in a .h file, and anyone can #include and instantiate it. You can
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// even instantiate it more than once in the same program. To tell
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// different instances apart, you give each of them a name, which will
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// become part of the test case name and can be used in test filters.
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// The list of types we want to test. Note that it doesn't have to be
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// defined at the time we write the TYPED_TEST_P()s.
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typedef Types<OnTheFlyPrimeTable, PreCalculatedPrimeTable>
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PrimeTableImplementations;
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INSTANTIATE_TYPED_TEST_SUITE_P(OnTheFlyAndPreCalculated, // Instance name
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PrimeTableTest2, // Test case name
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PrimeTableImplementations); // Type list
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#endif // GTEST_HAS_TYPED_TEST_P
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} // namespace
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