// Test add picture to worksheet from bytes with illegal cell coordinates.
assert.EqualError(t,xlsx.AddPictureFromBytes("Sheet1","A","","Excel Logo",".jpg",file),`cannot convert cell "A" to coordinates: invalid cell name "A"`)
assert.EqualError(t,f.AddPictureFromBytes("Sheet1","A","","Excel Logo",".png",file),`cannot convert cell "A" to coordinates: invalid cell name "A"`)