CMake For Google Test Code Answer

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I am trying to follow this tutorial for running a Google Tests file but I am having some trouble with the CMakeLists.txt.


cmake_minimum_required(VERSION 2.6)

# Locate GTest
find_package(GTest REQUIRED)

# Link runTests with what we want to test and the GTest and pthread library
add_executable(runTests tests.cpp)
target_link_libraries(runTests ${GTEST_LIBRARIES} pthread)

what exactly is runTests here? Is it my program’s main() file? How should I replace it according to my program? Currently, I have this error when I use make:

/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
CMakeFiles/runTests.dir/build.make:95: recipe for target 'runTests' failed
make[2]: *** [runTests] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/runTests.dir/all' failed
make[1]: *** [CMakeFiles/runTests.dir/all] Error 2
Makefile:83: recipe for target 'all

main.cpp: (I tried moving this part to the end of the tests.cpp file too but still didn’t work)

#include <iostream>
#include "Player.h"
#include "gtest/gtest.h"

using namespace std;

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


#ifndef PLAYER_H
#define PLAYER_H

#include <iostream>  
using namespace std;

class Player

    int inventory;

    int decreaseInventory(int numOfBeers);
    void setInventory(int newInventory);
    int getBackOrder();
    int getCost();
    int getInventory();

    bool operator ==(Player& p);

    cout << " Default Player Constructorn";
    inventory = 12;
    backorder = 0;
    cost = 0;
    orderDelay = 0;
    shipmentDeplay = 0;

void Player::setInventory(int newInventory)
    inventory = newInventory;

int Player::decreaseInventory(int numOfBeers)
    inventory = inventory - numOfBeers;

int Player::getInventory()
    return inventory;



#include "gtest/gtest.h"
#include "Player.h"

TEST(playerTest, decreaseInventoryTest ) {

    Player p;
    int curr_inv = p.getInventory();
    EXPECT_EQ(curr_inv-3, p.decreaseInventory(3));


How can I run my tests?


what exactly is runTests here? Is it my program’s main() file? How should I replace it according to my program?

runTests is the name of an executable that you’re trying to build. It needs a main just like any executable will, and there are two options: 1) write your own or 2) use the one provided with gtest. If you want to go with option 1, add main.cpp to the add_executable line.

add_executable(runTests tests.cpp main.cpp)

The better option in my opinion is to use the main provided by GTest, since it gives you some command line arguments. You can use that by adding it to your target_link_libraries line.

target_link_libraries(runTests ${GTEST_LIBRARIES} ${GTEST_MAIN_LIBRARIES} pthread)
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