new_contents: import subprocess
  import sys
  import os
  import shutil
  
  
  def pytest_configure(config):
      subprocess.check_call([sys.executable, 'build.py', '--coverage'])
  
      subprocess.check_call([
          'lcov', '--base-directory', '.', '--directory',
          'build/temp.linux-x86_64-3.5', '--zerocounters', '-q'])
  
  
  def pytest_unconfigure(config):
      try:
          os.unlink('coverage.info')
      except FileNotFoundError:
          pass
  
      subprocess.check_call([
          'lcov', '--base-directory', '.', '--directory',
          'build/temp.linux-x86_64-3.5', '-c', '-o', 'coverage.info', '-q'])
      subprocess.check_call([
          'lcov', '--remove', 'coverage.info',
          '/usr*', '-o', 'coverage.info', '-q']) 
  
      shutil.rmtree('test_coverage')
  
      subprocess.check_call([
          'genhtml', '-o', 'test_coverage', 'coverage.info', '-q'
      ])
  
subject: integrate lcov in the test suite