Google Test (GTest) with CMake

CMakeLists.txt

cmake_minimum_required(VERSION 3.16)
set(CMAKE_CXX_STANDARD 11)

project(gtestTest)

find_package(Threads REQUIRED)
find_package(GTest REQUIRED)
include_directories(${GTEST_INCLUDE_DIRS})

add_executable(hello_test hello_test.cc)
# Note that we also have to link to the pthread library or the application won’t compile.
target_link_libraries(hello_test ${GTEST_LIBRARIES} pthread)

hello_test.cc

#include <gtest/gtest.h>
#include <math.h>

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