Saturday, October 27, 2018

GTest Hello

GTest

Google test is a framework for writing C++ unit tests

Download and install

apt (download source code)
run cmake
copy to /usr/lib

sudo apt install libgtest-dev
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

Demo Project structure

├── CMakeLists.txt
├── bin
├── build
├── src
│   ├── CMakeLists.txt
│   ├── hello.cpp
│   └── whattotest.cpp
└── tests
    ├── CMakeLists.txt
    ├── tests.cpp
    └── tests_main.cpp

code under tests (whattotest.cpp)

#include <math.h>

double squareRoot(const double a){
    double b = sqrt(a);
    if (b != b){
        return -1.0;
    }else {
        return sqrt(a);
    }
}

test main file (tests_main.cpp)

#include <gtest/gtest.h>

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

Tests (tests.cpp)

#include "../src/whattotest.cpp"
#include <gtest/gtest.h>
 
TEST(SquareRootTest, PositiveNos) { 
    ASSERT_EQ(6, squareRoot(36.0));
}
 
TEST(SquareRootTest, NegativeNos) {
    ASSERT_EQ(-1.0, squareRoot(-15.0));
}

Main CMakeLists.txt

cmake_minimum_required(VERSION 3.0)
project(scope)

#set binary output
set(EXECUTABLE_OUTPUT_PATH ${CMAKE_SOURCE_DIR}/bin)
message(${EXECUTABLE_OUTPUT_PATH})
#set flags
set(CMAKE_CXX_STANDARD 14)

#add source directory
add_subdirectory(src)
add_subdirectory(tests)

tests folder CMakeLists.txt

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

Reference

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