new_contents: import unittest
  
  import geoviews.feature as gf
  
  from cartopy import crs
  
  class TestGeoviews(unittest.TestCase):
      def test_viz(self):
          (gf.ocean + gf.land + gf.ocean * gf.land * gf.coastline * gf.borders).options(
              'Feature', projection=crs.Geostationary(), global_extent=True, height=325
          ).cols(3)
  
subject: add tests for geoviews