目录
环境准备
bash
git clone https://github.com/google/googletest.git
说cmkae版本过低了,解决方法
进到googletest中
bash
cmake CMakeLists.txt
make
sudo make install
bash
ls /usr/local/lib
存在以下文件说明安装成功
中间出了个问题就是,总是出现链接不成功,导致库导入不进去
可以对G++命令加上-L编译的命令,这样就指定了库的搜索路径。
bash
g++ sample1.cc sample1_unittest.cc -o sample1 -L/usr/local/lib -lgtest -lgtest_main -lpthread
GoogleTest
单元测试是用来对一个模块、一个函数或者一个类来进行正确性检测的测试工作。
比如我们测试一个岛问题的解决方法
cpp
#include <iostream>
#include <initializer_list>
#include <vector>
#include <gtest/gtest.h>
using namespace std;
class IslandProblem {
public:
using Matrix = vector<vector<char>>;
IslandProblem(const initializer_list<vector<char>> list) {
_islands.assign(list);
}
int Do() {
int num = 0;
for (int row = 0; row < (int)_islands.size(); row++) {
for (int col = 0; col < (int)_islands[row].size(); col++) {
if (canUnion(row, col)) {
num++;
unionIsland(row, col);
}
}
}
return num;
}
protected:
bool canUnion(int row, int col) {
if (row < 0 || row >= (int)_islands.size())
return false;
if (col < 0 || col >= (int)_islands[row].size())
return false;
if (_islands[row][col] != 1)
return false;
return true;
}
void unionIsland(int row, int col) {
_islands[row][col] = 2;
// up
if (canUnion(row-1, col)) unionIsland(row-1, col);
// left
if (canUnion(row, col-1)) unionIsland(row, col-1);
// down
if (canUnion(row+1, col)) unionIsland(row+1, col);
// right
if (canUnion(row, col+1)) unionIsland(row, col+1);
}
private:
Matrix _islands;
};
TEST(IslandProblem, logic) {
IslandProblem ip1{
{1,1,1,1},
{1,0,1,1},
{0,0,0,0},
{1,0,1,0}
};
EXPECT_EQ(ip1.Do(), 3);
IslandProblem ip2{
{1,0,1,1},
{1,0,1,1},
{0,0,0,0},
{1,0,1,0}
};
EXPECT_EQ(ip2.Do(), 4);
}
TEST(IslandProblem, boundary) {
IslandProblem ip1{
{1,1,1,1},
{1,0,0,1},
{1,0,0,1},
{1,1,1,1}
};
EXPECT_EQ(ip1.Do(), 1);
IslandProblem ip2{
};
EXPECT_EQ(ip2.Do(), 0);
}
TEST(IslandProblem, exception) {
IslandProblem ip1{
{-1,1,1,1},
{1,0,0,1},
{1,0,0,1},
{1,1,1,1}
};
EXPECT_EQ(ip1.Do(), 1);
}
解决方法要考虑:逻辑问题(功能正确),边界问题,异常情况。TEST的测试案例中已经把这些问题考虑进去了。
然后实际去测试,说明解决方法能够考虑以上三种情况