【GoogleTest】GoogleTest单元测试(1)快速上手

#ifndef GTEST_SAMPLES_SAMPLE1_H_
#define GTEST_SAMPLES_SAMPLE1_H_

// 阶乘
// Returns n! (the factorial of n).  For negative n, n! is defined to be 1.
// 返回n！（n的阶乘）。对于负n，n！定义为1。
int Factorial(int n);

// 判断是否为质数
// Returns true iff n is a prime number.
bool IsPrime(int n);

#endif 

#include "sample1.h"


// Returns n! (the factorial of n).  For negative n, n! is defined to be 1.
int Factorial(int n) {
  int result = 1;
  for (int i = 1; i <= n; i++) {
    result *= i;
  }

  return result;
}

// Returns true iff n is a prime number.
bool IsPrime(int n) {
  // Trivial case 1: small numbers
  if (n <= 1) return false;

  // Trivial case 2: even numbers
  if (n % 2 == 0) return n == 2;

  // Now, we have that n is odd and n >= 3.

  // Try to divide n by every odd number i, starting from 3
  for (int i = 3; ; i += 2) {
    // We only have to try i up to the square root of n
    if (i > n/i) break;

    // Now, we have i <= n/i < n.
    // If n is divisible by i, n is not prime.
    if (n % i == 0) return false;
  }

  // n has no integer factor in the range (1, n), and thus is prime.
  return true;
}

#include <limits.h>
#include "sample1.h"
#include <gtest/gtest.h>
namespace {

    //TEST(测试套，测试用例名称)
    TEST(FactorialTest, Negative) {
        //调用对应函数，结果是否为1，判断测试用例是否通过
        EXPECT_EQ(1, Factorial(-5));
        EXPECT_EQ(1, Factorial(-1));
        EXPECT_GT(Factorial(-10), 0);
    }

    TEST(FactorialTest, Zero) {
        EXPECT_EQ(1, Factorial(0));
    }

    TEST(FactorialTest, Positive) {
        EXPECT_EQ(1, Factorial(1));
        EXPECT_EQ(2, Factorial(2));
        EXPECT_EQ(6, Factorial(3));
        EXPECT_EQ(40320, Factorial(8));
    }

    // Tests IsPrime()
    TEST(IsPrimeTest, Negative) {
      EXPECT_FALSE(IsPrime(-1));
      EXPECT_FALSE(IsPrime(-2));
      EXPECT_FALSE(IsPrime(INT_MIN));
    }

    TEST(IsPrimeTest, Trivial) {
      EXPECT_FALSE(IsPrime(0));
      EXPECT_FALSE(IsPrime(1));
      EXPECT_TRUE(IsPrime(2));
      EXPECT_TRUE(IsPrime(3));
    }

    TEST(IsPrimeTest, Positive) {
      EXPECT_FALSE(IsPrime(4));
      EXPECT_TRUE(IsPrime(5));
      EXPECT_FALSE(IsPrime(6));
      EXPECT_TRUE(IsPrime(23));
    }
}  // namespace

g++ sample1.cc sample1_unittest.cc -lgtest -std=c++14 -lgtest_main -lpthread -o test1

./test1

int main(int argc, char** argv){
    testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}

g++ sample1.cc sample1_unittest.cc -lgtest -std=c++14  -lpthread -o test1