old_contents: #!/usr/bin/env python
  import os, json, sys
  import vtk
  from vtk.test import Testing
  
  args = sys.argv[1:]
  temp_dir = args[args.index("-T") + 1]
  tmp_file = os.path.join(temp_dir, 'wavelet_slice_3.json')
  expected_first_values = [75.9335, 102.695, 91.2387, 115.507, 105.995, 125.724, 118.773, 132.24, 128.255, 134.254, 133.446, 131.431, 133.843, 123.998, 129.505]
  
  # Image pipeline
  image1 = vtk.vtkRTAnalyticSource()
  image1.Update()
  output = image1.GetOutput()
  dim_ref = [value for value in output.GetDimensions()]
  origin_ref = [value for value in output.GetOrigin()]
  spacing_ref = [value for value in output.GetSpacing()]
  
  print dim_ref
  print origin_ref
  print spacing_ref
  
  writer = vtk.vtkJSONImageWriter()
  writer.SetInputData(image1.GetOutput())
  writer.SetFileName(tmp_file)
  writer.SetArrayName("RTData")
  writer.SetSlice(3)
  writer.Write()
  
  # Try to load JSON file and compare with dumped data
  print "Writing file:", tmp_file
  with open(tmp_file, "r") as json_file:
      json_obj = json.load(json_file)
      slice = json_obj['RTData']
      if json_obj["dimensions"] != dim_ref:
          print "Dimension ERROR"
          sys.exit(1)
      else:
          print "Dimension OK"
      if json_obj["origin"] != origin_ref:
          print "Origin ERROR"
          sys.exit(1)
      else:
          print "Origin OK"
      if json_obj["spacing"] != spacing_ref:
          print "Spacing ERROR"
          sys.exit(1)
      else:
          print "Spacing OK"
      if len(slice) == 441:
          print "Slice size OK"
      else:
          print "Slice size ERROR - Size of ", str(len(slice))
          sys.exit(1)
      for i in range(len(expected_first_values)):
          if expected_first_values[i] != slice[i]:
              sys.exit(1)
  
  print "All good..."
  sys.exit()
  
new_contents: #!/usr/bin/env python
  import os, json, sys
  import vtk
  from vtk.test import Testing
  
  args = sys.argv[1:]
  temp_dir = args[args.index("-T") + 1]
  
  # Always use / to prevent windows/python issue with backslash
  tmp_file = temp_dir + '/wavelet_slice_3.json'
  
  expected_first_values = [75.9335, 102.695, 91.2387, 115.507, 105.995, 125.724, 118.773, 132.24, 128.255, 134.254, 133.446, 131.431, 133.843, 123.998, 129.505]
  
  # Image pipeline
  image1 = vtk.vtkRTAnalyticSource()
  image1.Update()
  output = image1.GetOutput()
  dim_ref = [value for value in output.GetDimensions()]
  origin_ref = [value for value in output.GetOrigin()]
  spacing_ref = [value for value in output.GetSpacing()]
  
  print dim_ref
  print origin_ref
  print spacing_ref
  
  writer = vtk.vtkJSONImageWriter()
  writer.SetInputData(image1.GetOutput())
  writer.SetFileName(tmp_file)
  writer.SetArrayName("RTData")
  writer.SetSlice(3)
  writer.Write()
  
  # Try to load JSON file and compare with dumped data
  print "Writing file:", tmp_file
  with open(tmp_file, "r") as json_file:
      json_obj = json.load(json_file)
      slice = json_obj['RTData']
      if json_obj["dimensions"] != dim_ref:
          print "Dimension ERROR"
          sys.exit(1)
      else:
          print "Dimension OK"
      if json_obj["origin"] != origin_ref:
          print "Origin ERROR"
          sys.exit(1)
      else:
          print "Origin OK"
      if json_obj["spacing"] != spacing_ref:
          print "Spacing ERROR"
          sys.exit(1)
      else:
          print "Spacing OK"
      if len(slice) == 441:
          print "Slice size OK"
      else:
          print "Slice size ERROR - Size of ", str(len(slice))
          sys.exit(1)
      for i in range(len(expected_first_values)):
          if expected_first_values[i] != slice[i]:
              sys.exit(1)
  
  print "All good..."
  sys.exit()
  
subject: Use / for path separator to prevent Windows related issue with escape char