old_contents: import os
  import unittest
  
  import numpy as np
  
  from sdi.binary import Dataset
  
  
  class TestRead(unittest.TestCase):
      """ Test basic reading of binary files
      """
  
      def setUp(self):
          self.test_dir = os.path.dirname(__file__)
  
      def test_read(self):
          """ Test that all test files can be read without errors """
          for root, dirs, files in os.walk(os.path.join(self.test_dir, 'files')):
              for filename in files:
                  if filename.endswith('.bin'):
                      d = Dataset(os.path.join(root, filename))
                      data = d.as_dict()
                      for freq in data['frequencies'].keys():
                          x = data['frequencies'][freq]['utm_x']
                          y = data['frequencies'][freq]['utm_y']
                          image = data['frequencies'][200.0]['intensity']
                          self.assertIsInstance(x, np.ndarray)
                          self.assertIsInstance(y, np.ndarray)
                          self.assertIsInstance(image, np.ndarray)
  
      def test_fill_nans(self):
          """ Test for "IndexError: tuple index out of range"
          """
          filename = os.path.join(self.test_dir, 'files', '07050823.bin')
          d = Dataset(filename)
          data = d.as_dict()
  
      def test_overflowerror(self):
          """ Test for "OverflowError: Python int too large to convert to C long"
          """
          filename = os.path.join(self.test_dir, 'files', '09062409.bin')
          d = Dataset(filename)
          data = d.as_dict()
  
      def test_discontinuity(self):
          """ Test for "IndexError: index out of bounds"
          """
          filename = os.path.join(self.test_dir, 'files', '08091852.bin')
          d = Dataset(filename)
          data = d.as_dict()
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import os
  import unittest
  
  import numpy as np
  
  from sdi.binary import Dataset
  
  
  class TestRead(unittest.TestCase):
      """ Test basic reading of binary files
      """
  
      def setUp(self):
          self.test_dir = os.path.dirname(__file__)
  
      def test_read(self):
          """ Test that all test files can be read without errors """
          for root, dirs, files in os.walk(os.path.join(self.test_dir, 'files')):
              for filename in files:
                  if filename.endswith('.bin'):
                      d = Dataset(os.path.join(root, filename))
                      data = d.as_dict()
                      for freq in data['frequencies'].keys():
                          x = data['frequencies'][freq]['easting']
                          y = data['frequencies'][freq]['northing']
                          image = data['frequencies'][200.0]['intensity']
                          self.assertIsInstance(x, np.ndarray)
                          self.assertIsInstance(y, np.ndarray)
                          self.assertIsInstance(image, np.ndarray)
  
      def test_fill_nans(self):
          """ Test for "IndexError: tuple index out of range"
          """
          filename = os.path.join(self.test_dir, 'files', '07050823.bin')
          d = Dataset(filename)
          data = d.as_dict()
  
      def test_overflowerror(self):
          """ Test for "OverflowError: Python int too large to convert to C long"
          """
          filename = os.path.join(self.test_dir, 'files', '09062409.bin')
          d = Dataset(filename)
          data = d.as_dict()
  
      def test_discontinuity(self):
          """ Test for "IndexError: index out of bounds"
          """
          filename = os.path.join(self.test_dir, 'files', '08091852.bin')
          d = Dataset(filename)
          data = d.as_dict()
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: update test_read to expect changed keys: utm_x/utm_y -> easting/northing