Google单元测试sample分析（二）

本文开始介绍googletest/googletest/sample/sample5_unittest.cc
有关TEST_F测试夹具的使用案例

class QuickTest : public testing::Test {protected:// Remember that SetUp() is run immediately before a test starts.// This is a good place to record the start time.void SetUp() override { start_time_ = time(nullptr); }// TearDown() is invoked immediately after a test finishes.  Here we// check if the test was too slow.void TearDown() override {// Gets the time when the test finishesconst time_t end_time = time(nullptr);// Asserts that the test took no more than ~5 seconds.  Did you// know that you can use assertions in SetUp() and TearDown() as// well?EXPECT_TRUE(end_time - start_time_ <= 5) << "The test took too long.";}// The UTC time (in seconds) when the test startstime_t start_time_;
};

这里的QuickTest继承自testing::Test，并重写SetUp和TearDown方法，SetUp方法在每个TEST_F开始运行一次，退出执行TearDown方法一次。
这个案例里记录整个TEST_F测试夹具的测试用例的运行时间

class IntegerFunctionTest : public QuickTest {// We don't need any more logic than already in the QuickTest fixture.// Therefore the body is empty.
};// Now we can write tests in the IntegerFunctionTest test case.// Tests Factorial()
TEST_F(IntegerFunctionTest, Factorial) {// Tests factorial of negative numbers.EXPECT_EQ(1, Factorial(-5));EXPECT_EQ(1, Factorial(-1));EXPECT_GT(Factorial(-10), 0);// Tests factorial of 0.EXPECT_EQ(1, Factorial(0));// Tests factorial of positive numbers.EXPECT_EQ(1, Factorial(1));EXPECT_EQ(2, Factorial(2));EXPECT_EQ(6, Factorial(3));EXPECT_EQ(40320, Factorial(8));
}

这里IntegerFunctionTest 继承自QuickTest ，内部无其他实现，测试夹具IntegerFunctionTest整个运行时间

class QueueTest : public QuickTest {protected:void SetUp() override {// First, we need to set up the super fixture (QuickTest).QuickTest::SetUp();// Second, some additional setup for this fixture.q1_.Enqueue(1);q2_.Enqueue(2);q2_.Enqueue(3);}// By default, TearDown() inherits the behavior of// QuickTest::TearDown().  As we have no additional cleaning work// for QueueTest, we omit it here.//// virtual void TearDown() {//   QuickTest::TearDown();// }Queue<int> q0_;Queue<int> q1_;Queue<int> q2_;
};// Now, let's write tests using the QueueTest fixture.// Tests the default constructor.
TEST_F(QueueTest, DefaultConstructor) {EXPECT_EQ(0u, q0_.Size());
}// Tests Dequeue().
TEST_F(QueueTest, Dequeue) {int* n = q0_.Dequeue();EXPECT_TRUE(n == nullptr);n = q1_.Dequeue();EXPECT_TRUE(n != nullptr);EXPECT_EQ(1, *n);EXPECT_EQ(0u, q1_.Size());delete n;n = q2_.Dequeue();EXPECT_TRUE(n != nullptr);EXPECT_EQ(2, *n);EXPECT_EQ(1u, q2_.Size());delete n;
}

QueueTest类继承自QuickTest，并重写SetUp方法，在SetUp方法里调用QuickTest的父类方法，然后对Queue队列做初始化，

TEST_F(QueueTest, DefaultConstructor) {EXPECT_EQ(0u, q0_.Size());
}

这里判断q0队列大小是否为0u

TEST_F(QueueTest, Dequeue) {int* n = q0_.Dequeue();EXPECT_TRUE(n == nullptr);n = q1_.Dequeue();   //先出列判断是否为nullptr，在判断数据是否为1，最后判断队列大小是否为0，最后delete删除nEXPECT_TRUE(n != nullptr);EXPECT_EQ(1, *n);EXPECT_EQ(0u, q1_.Size());delete n;n = q2_.Dequeue();EXPECT_TRUE(n != nullptr);EXPECT_EQ(2, *n);EXPECT_EQ(1u, q2_.Size());delete n;
}