Google test是Google开发的编写C/C++代码单元测试的框架。

在本文中描述了如何在Ubuntu上使用gtest.

首先需要下载gtest的安装包:

sudo apt-get install libgtest-dev

sudo apt-get install cmake # install cmake
cd /usr/src/gtest
sudo cmake CMakeLists.txt
sudo make
 
# copy or symlink libgtest.a and libgtest_main.a to your /usr/lib folder
sudo cp *.a /usr/lib

假如我们要测试一个函数如下：

// whattotest.cpp
#include <math.h>
 
double squareRoot(const double a) {
    double b = sqrt(a);
    if(b != b) { // nan check
        return -1.0;
    }else{
        return sqrt(a);
    }
}

// tests.cpp
#include "whattotest.cpp"
#include <gtest/gtest.h>
 
TEST(SquareRootTest, PositiveNos) { 
    ASSERT_EQ(6, squareRoot(36.0));
    ASSERT_EQ(18.0, squareRoot(324.0));
    ASSERT_EQ(25.4, squareRoot(645.16));
    ASSERT_EQ(0, squareRoot(0.0));
}
 
TEST(SquareRootTest, NegativeNos) {
    ASSERT_EQ(-1.0, squareRoot(-15.0));
    ASSERT_EQ(-1.0, squareRoot(-0.2));
}
 
int main(int argc, char **argv) {
    testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}

g++ -o tests test.cpp -lgtest -lpthread

[==========] Running 2 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 2 tests from SquareRootTest
[ RUN      ] SquareRootTest.PositiveNos
[       OK ] SquareRootTest.PositiveNos (0 ms)
[ RUN      ] SquareRootTest.NegativeNos
[       OK ] SquareRootTest.NegativeNos (0 ms)
[----------] 2 tests from SquareRootTest (0 ms total)


[----------] Global test environment tear-down
[==========] 2 tests from 1 test case ran. (0 ms total)
[  PASSED  ] 2 tests.

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