Google Test inside OpenWrt

I'd like to execute GMOCK and GTEST tests inside OpenWRT. I have x86_64 machine. My package is for x32 device. I tried copy headers manually, but, of course, it does not work. It is important to run tests inside the device, this is the main reason.

Is it false that the only possible way for me is to compile inside the device?(Such approach is strongly not desired) If not, how to add gtest&gmock to the package?