new_contents: #!/usr/bin/env python
  # -------------------------------------------------------------------------------
  # Name:        test_vpr.py
  # Purpose:     testing file for the wradlib.vpr module
  #
  # Authors:     wradlib developers
  #
  # Created:     26.02.2016
  # Copyright:   (c) wradlib developers
  # Licence:     The MIT License
  # -------------------------------------------------------------------------------
  
  import unittest
  
  import wradlib.vpr as vpr
  import wradlib.georef as georef
  import numpy as np
  
  class VPRHelperFunctionsTest(unittest.TestCase):
      def setUp(self):
          self.site = (7.0, 53.0, 100.)
          self.proj = georef.epsg_to_osr(31467)
          self.az = np.arange(0., 360., 1.)
          self.r = np.arange(0, 100000, 1000)
          self.el = 2.5
          self.coords = vpr.volcoords_from_polar(self.site, self.el, self.az, self.r, self.proj)
  
      def test_out_of_range(self):
          pass
  
      def test_blindspots(self):
          pass
  
      def test_volcoords_from_polar(self):
          coords = vpr.volcoords_from_polar(self.site, self.el, self.az, self.r, self.proj)
          pass
  
      def test_volcoords_from_polar_irregular(self):
          coords = vpr.volcoords_from_polar_irregular(self.site, [self.el, 5.0], self.az, self.r, self.proj)
          pass
  
      def test_synthetic_polar_volume(self):
          vol = vpr.synthetic_polar_volume(self.coords)
          pass
  
      def test_vpr_interpolator(self):
          pass
  
      def test_correct_vpr(self):
          pass
  
      def test_mean_norm_from_vpr(self):
          pass
  
      def test_norm_vpr_stats(self):
          pass
  
      def test_make_3D_grid(self):
          maxrange = 200000.
          maxalt = 5000.
          horiz_res = 2000.
          vert_res = 250.
          vpr.make_3D_grid(self.site, self.proj, maxrange, maxalt, horiz_res, vert_res)
          pass
  
  class CartesianVolumeTest(unittest.TestCase):
      def test_CartesianVolume(self):
          pass
  
      def test_CAPPI(self):
          pass
  
      def test_PseudoCAPPI(self):
          pass
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: add test_vpr.py, add test functions and stubs