How to install googletest?

Question

I searched for googletests using muon, but it looks like ubuntu doesn't have packages for it. Do I need to install using sources?

Answer 1

New information:

It is worth noting libgtest0 no longer exists. As of 2013 or so (I am not sure of the date of the change) see this question:

Why no library files installed for google test?

---

Old answer prior to 2012:

It is in the Ubuntu repositories

sudo apt-get install libgtest0 libgtest-dev

See also man gtest-config

Answer 2

Minimal runnable example

Since Debian/Ubuntu refuse to pack a prebuilt as mentioned at: Why no library files installed for google test? I'll just clone and build it myself (or in a real project, add it as a submodule):

git clone https://github.com/google/googletest
cd googletest
git checkout b1fbd33c06cdb0024c67733c6fdec2009d17b384
mkdir build
cd build
cmake ..
make -j`nproc`
cd ../..

then I use it with my test file main.cpp:

g++ \
  -Wall \
  -Werror \
  -Wextra \
  -pedantic \
  -O0 \
  -I googletest/googletest/include \
  -std=c++11 \
  -o main.out \
  main.cpp \
  googletest/build/lib/libgtest.a \
  -lpthread \
;

main.cpp

#include <gtest/gtest.h>
int myfunc(int n) {
    return n + 1;
}
TEST(asdfTest, HandlesPositiveInput) {
    EXPECT_EQ(myfunc(1), 2);
    EXPECT_EQ(myfunc(2), 3);
}
int main(int argc, char **argv) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}

to get the expected output:

[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from asdfTest
[ RUN      ] asdfTest.HandlesPositiveInput
[       OK ] asdfTest.HandlesPositiveInput (0 ms)
[----------] 1 test from asdfTest (0 ms total)
[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (0 ms total)
[  PASSED  ] 1 test.

Alternatively, you can also remove the main function from the main.cpp file and instead use the default one provided by libgtest_main.a:

g++ \
  -Wall \
  -Werror \
  -Wextra \
  -pedantic \
  -O0 \
  -I googletest/googletest/include \
  -std=c++11 \
  -o main.out \
  main.cpp \
  googletest/build/lib/libgtest.a \
  googletest/build/lib/libgtest_main.a \
  -lpthread \
;

Tested on Ubuntu 20.04.