If you are developing in native code (not java) and you are in for a little extra work, this is what I do (and suggest) :
Use an OpenGL ES emulator library for windows/linux/whatever you use
(like http://www.malideveloper.com/opengl-es-20-emulator.php or libgles2-mesa-dev on linux)
and make your game cross-platform (just for testing).
Once you get there, it's much easier to test ANY resolution on a desktop environment
(just resize your game window and check the output).