add_woden_uvfits.py

add_woden_uvfits.py is supposed to sum two different uvfits files, which is useful for example to add foregrounds onto a EoR signal simulation.

test_add_woden_uvfits.py

This test writes out some example uvfits files with known contents, creates a mock of a command line argument object, and runs add_woden_uvfits.main to create combined outputs. These outputs are checked to be the sum of the inputs. A number of input arguments that should cause failures, including attempting to add to uvfits with different dimensions, are also tested.