Gtest基础

测试代码

sample.h

#ifndef _SAMPLE_H_
#define _SAMPLE_H_

// Returns n! (the factorial of n).  For negative n, n! is defined to be 1.
int Factorial(int n);

// Returns true iff n is a prime number.
bool IsPrime(int n);

#endif

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sample.c

#include "sample.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;
}

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sample_unittest.c

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

TEST(FactorialTest, Negative) {
    // This test is named "Negative", and belongs to the "FactorialTest"
    // test case.
    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

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编译

g++ sample.c sample_unittest.c  -lgtest -std=c++11 -lgtest_main -lpthread -o test

运行

由于没有单独写main函数，则由Gtest提供main函数，需要libgtest_main.a库

如果自己提供main函数可以不需要libgtest_main.a库

main.c

#include <gtest/gtest.h>
int main(int argc, char** argv){
  testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}

View Code

g++ sample.c sample_unittest.c  main.c -lgtest -std=c++11 -lpthread -o test

编译、运行结果和上面一样。