learn how to use googletest to test C language source code.

$ cd gtest-1.6.0/
$ g++ -I./include -I./ -c ./src/gtest-all.cc
$ g++ -I./include -I./ -c ./src/gtest_main.cc
$ ar -rv libgtest.a gtest-all.o gtest_main.o

then copy the libgtest.a file and the include folder under gtest-1.6.0/ to your project's directory.

1. change directory to /mytest
   $ cd mytest/

2. Compile:
   $ g++ -I./include -c A.cpp
$ g++ -I./include -c A_test.cpp

3. Link:
   $ g++ A.o A_test.o libgtest.a -o test

4. Execute:
   $ ./test.exe

1. change directory
   $ cd mytest/make/

2. Make:
   $ make

3. Execute:
   $ ./test.exe