old_contents: 
  import aacgmv2
  
  
  def test_main():
      assert aacgmv2  # use your library here
  
new_contents: 
  import aacgmv2
  import aacgmv2_interface
  
  
  def test_main():
      assert aacgmv2
      assert aacgmv2_interface
  
subject: add basic test