Was only able to test this on linux: Linux Mint 18.
On linux, this will download the source and compile it
On Windows, it will hopefully download the binaries provided by the dev team.
No implementation for MacoOS. I do not have a Mac so I have no idea how to compile stuff on it.
cd to the directory that contains conanfile.py
conan export GavinNL/testing
conan install glfw/3.2@GavinNL/testing --build
cd test
mkdir build
cd build
conan install ..
cmake ..
make
cd bin
./glfw_test