Can boolean operators be used with the preprocessor?

I wondering if it possible to have a preprocessor OR or AND statement? I have this code where I want to run under _DEBUG or _UNIT_TEST tags(?).

What I want is something like the following:

#if _DEBUG || _UNIT_TEST
  //Code here
#endif

If this is not possible, is there a workaround to achieve the same thing without having to duplicate the code using a #elseif?