1 // Copyright 2005, Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 // 30 // Author: wan (at) google.com (Zhanyong Wan) 31 32 // This sample teaches how to reuse a test fixture in multiple test 33 // cases by deriving sub-fixtures from it. 34 // 35 // When you define a test fixture, you specify the name of the test 36 // case that will use this fixture. Therefore, a test fixture can 37 // be used by only one test case. 38 // 39 // Sometimes, more than one test cases may want to use the same or 40 // slightly different test fixtures. For example, you may want to 41 // make sure that all tests for a GUI library don't leak important 42 // system resources like fonts and brushes. In Google Test, you do 43 // this by putting the shared logic in a super (as in "super class") 44 // test fixture, and then have each test case use a fixture derived 45 // from this super fixture. 46 47 #include <limits.h> 48 #include <time.h> 49 #include "sample3-inl.h" 50 #include "gtest/gtest.h" 51 #include "sample1.h" 52 53 // In this sample, we want to ensure that every test finishes within 54 // ~5 seconds. If a test takes longer to run, we consider it a 55 // failure. 56 // 57 // We put the code for timing a test in a test fixture called 58 // "QuickTest". QuickTest is intended to be the super fixture that 59 // other fixtures derive from, therefore there is no test case with 60 // the name "QuickTest". This is OK. 61 // 62 // Later, we will derive multiple test fixtures from QuickTest. 63 class QuickTest : public testing::Test { 64 protected: 65 // Remember that SetUp() is run immediately before a test starts. 66 // This is a good place to record the start time. 67 virtual void SetUp() { 68 start_time_ = time(NULL); 69 } 70 71 // TearDown() is invoked immediately after a test finishes. Here we 72 // check if the test was too slow. 73 virtual void TearDown() { 74 // Gets the time when the test finishes 75 const time_t end_time = time(NULL); 76 77 // Asserts that the test took no more than ~5 seconds. Did you 78 // know that you can use assertions in SetUp() and TearDown() as 79 // well? 80 EXPECT_TRUE(end_time - start_time_ <= 5) << "The test took too long."; 81 } 82 83 // The UTC time (in seconds) when the test starts 84 time_t start_time_; 85 }; 86 87 88 // We derive a fixture named IntegerFunctionTest from the QuickTest 89 // fixture. All tests using this fixture will be automatically 90 // required to be quick. 91 class IntegerFunctionTest : public QuickTest { 92 // We don't need any more logic than already in the QuickTest fixture. 93 // Therefore the body is empty. 94 }; 95 96 97 // Now we can write tests in the IntegerFunctionTest test case. 98 99 // Tests Factorial() 100 TEST_F(IntegerFunctionTest, Factorial) { 101 // Tests factorial of negative numbers. 102 EXPECT_EQ(1, Factorial(-5)); 103 EXPECT_EQ(1, Factorial(-1)); 104 EXPECT_TRUE(Factorial(-10) > 0); 105 106 // Tests factorial of 0. 107 EXPECT_EQ(1, Factorial(0)); 108 109 // Tests factorial of positive numbers. 110 EXPECT_EQ(1, Factorial(1)); 111 EXPECT_EQ(2, Factorial(2)); 112 EXPECT_EQ(6, Factorial(3)); 113 EXPECT_EQ(40320, Factorial(8)); 114 } 115 116 117 // Tests IsPrime() 118 TEST_F(IntegerFunctionTest, IsPrime) { 119 // Tests negative input. 120 EXPECT_TRUE(!IsPrime(-1)); 121 EXPECT_TRUE(!IsPrime(-2)); 122 EXPECT_TRUE(!IsPrime(INT_MIN)); 123 124 // Tests some trivial cases. 125 EXPECT_TRUE(!IsPrime(0)); 126 EXPECT_TRUE(!IsPrime(1)); 127 EXPECT_TRUE(IsPrime(2)); 128 EXPECT_TRUE(IsPrime(3)); 129 130 // Tests positive input. 131 EXPECT_TRUE(!IsPrime(4)); 132 EXPECT_TRUE(IsPrime(5)); 133 EXPECT_TRUE(!IsPrime(6)); 134 EXPECT_TRUE(IsPrime(23)); 135 } 136 137 138 // The next test case (named "QueueTest") also needs to be quick, so 139 // we derive another fixture from QuickTest. 140 // 141 // The QueueTest test fixture has some logic and shared objects in 142 // addition to what's in QuickTest already. We define the additional 143 // stuff inside the body of the test fixture, as usual. 144 class QueueTest : public QuickTest { 145 protected: 146 virtual void SetUp() { 147 // First, we need to set up the super fixture (QuickTest). 148 QuickTest::SetUp(); 149 150 // Second, some additional setup for this fixture. 151 q1_.Enqueue(1); 152 q2_.Enqueue(2); 153 q2_.Enqueue(3); 154 } 155 156 // By default, TearDown() inherits the behavior of 157 // QuickTest::TearDown(). As we have no additional cleaning work 158 // for QueueTest, we omit it here. 159 // 160 // virtual void TearDown() { 161 // QuickTest::TearDown(); 162 // } 163 164 Queue<int> q0_; 165 Queue<int> q1_; 166 Queue<int> q2_; 167 }; 168 169 170 // Now, let's write tests using the QueueTest fixture. 171 172 // Tests the default constructor. 173 TEST_F(QueueTest, DefaultConstructor) { 174 EXPECT_EQ(0u, q0_.Size()); 175 } 176 177 // Tests Dequeue(). 178 TEST_F(QueueTest, Dequeue) { 179 int* n = q0_.Dequeue(); 180 EXPECT_TRUE(n == NULL); 181 182 n = q1_.Dequeue(); 183 EXPECT_TRUE(n != NULL); 184 EXPECT_EQ(1, *n); 185 EXPECT_EQ(0u, q1_.Size()); 186 delete n; 187 188 n = q2_.Dequeue(); 189 EXPECT_TRUE(n != NULL); 190 EXPECT_EQ(2, *n); 191 EXPECT_EQ(1u, q2_.Size()); 192 delete n; 193 } 194 195 // If necessary, you can derive further test fixtures from a derived 196 // fixture itself. For example, you can derive another fixture from 197 // QueueTest. Google Test imposes no limit on how deep the hierarchy 198 // can be. In practice, however, you probably don't want it to be too 199 // deep as to be confusing. 200
