Added unit tests for Helio submodule (#2974)
Added unit tests for Helio submodule (#2974)

* Added a unit test for helio.py

* Added more unit tests

* Update sunpy/net/tests/test_helio.py

Co-Authored-By: cquark7 <52439756f959419ccd333f803e61a6d1156400fd@gmail.com>

* fixed my merge

dpshelio/sunpy,dpshelio/sunpy,dpshelio/sunpy