old_contents: import os
  import subprocess
  import sys
  import unittest
  
  
  def find_uvloop_root():
      return os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
  
  
  class TestFlake8(unittest.TestCase):
  
      def test_flake8(self):
          edgepath = find_uvloop_root()
          config_path = os.path.join(edgepath, '.flake8')
          if not os.path.exists(config_path):
              raise RuntimeError('could not locate .flake8 file')
  
          try:
              import flake8  # NoQA
          except ImportError:
              raise unittest.SkipTest('flake8 moudule is missing')
  
          for subdir in ['examples', 'uvloop', 'tests']:
              try:
                  subprocess.run(
                      [sys.executable, '-m', 'flake8', '--config', config_path],
                      check=True,
                      stdout=subprocess.PIPE,
                      stderr=subprocess.PIPE,
                      cwd=os.path.join(edgepath, subdir))
              except subprocess.CalledProcessError as ex:
                  output = ex.output.decode()
                  raise AssertionError(
                      'flake8 validation failed:\n{}'.format(output)) from None
  
new_contents: import os
  import subprocess
  import sys
  import unittest
  
  
  def find_uvloop_root():
      return os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
  
  
  class TestFlake8(unittest.TestCase):
  
      def test_flake8(self):
          edgepath = find_uvloop_root()
          config_path = os.path.join(edgepath, '.flake8')
          if not os.path.exists(config_path):
              raise RuntimeError('could not locate .flake8 file')
  
          try:
              import flake8  # NoQA
          except ImportError:
              raise unittest.SkipTest('flake8 module is missing')
  
          for subdir in ['examples', 'uvloop', 'tests']:
              try:
                  subprocess.run(
                      [sys.executable, '-m', 'flake8', '--config', config_path],
                      check=True,
                      stdout=subprocess.PIPE,
                      stderr=subprocess.PIPE,
                      cwd=os.path.join(edgepath, subdir))
              except subprocess.CalledProcessError as ex:
                  output = ex.output.decode()
                  raise AssertionError(
                      'flake8 validation failed:\n{}'.format(output)) from None
  
subject: Correct a typo in test_sourcecode.py