old_contents: #!/usr/bin/python
  
  import unittest
  import os
  
  class DuplicateHeadersTests(unittest.TestCase):
      '''Checks for duplicate header names. Since all sensor headers get
        installed as part of the API, duplicate headers can cause bad linking,
        namespace class collisions and so on.'''
  
      def test_duplicate_headers(self):
          # Keep a list of all the header files in library
          header_files = []
  
          # Recusively search cwd for headers and add them to the list
          for root, dirs, files in os.walk(os.curdir):
              for file in files:
                  if file.endswith(('.h', '.hpp', '.hxx')):
                      header_files.append(file)
  
          # Test for duplicates
          duplicates = len(header_files) - len(set(header_files))
          self.assertEqual(duplicates, 7,
                  "\nDuplicate headers: %d\n" % duplicates)
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: #!/usr/bin/python
  
  import unittest
  import os
  
  class DuplicateHeadersTests(unittest.TestCase):
      '''Checks for duplicate header names. Since all sensor headers get
        installed as part of the API, duplicate headers can cause bad linking,
        namespace class collisions and so on.'''
  
      def test_duplicate_headers(self):
          # Keep a list of all the header files in library
          header_files = []
  
          # Recusively search cwd for headers and add them to the list
          for root, dirs, files in os.walk(os.curdir):
              dirs[:] = [d for d in dirs if d not in ['build']]
              for file in files:
                  if file.endswith(('.h', '.hpp', '.hxx')):
                      header_files.append(file)
  
          # Test for duplicates
          duplicates = len(header_files) - len(set(header_files))
          self.assertEqual(duplicates, 4,
                  "\nDuplicate headers: %d\n" % duplicates)
  
  if __name__ == '__main__':
      unittest.main()
  
subject: exclude build dir and update expected number of duplicates