Added tests for creating data frames. Two separate functions have been made; one for spherical rep frames and one for cartesian rep frames, as they are the only reps which have been used as default reps.
Added tests for creating data frames.
Two separate functions have been made; one for spherical rep frames and one for cartesian rep frames, as they are the only reps which have been used as default reps.

Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,dpshelio/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,Alex-Ian-Hamilton/sunpy