old_contents: import os.path
  import re
  import unittest
  
  from integration import *
  
  class TestCommand(IntegrationTest):
      def __init__(self, *args, **kwargs):
          IntegrationTest.__init__(
              self, os.path.join(examples_dir, '06_commands'), *args, **kwargs
          )
  
      def test_hello(self):
          self.assertRegexpMatches(
              self.build('hello'),
              re.compile('^hello$', re.MULTILINE)
          )
  
      def test_world(self):
          self.assertRegexpMatches(
              self.build('world'),
              re.compile('^world$', re.MULTILINE)
          )
  
      def test_script(self):
          self.assertRegexpMatches(
              self.build('script'),
              re.compile('^hello, world!$', re.MULTILINE)
          )
          self.assertTrue(os.path.exists(os.path.join(self.builddir, 'file')))
  
      def test_aliaas(self):
          output = self.build('hello-world')
          self.assertRegexpMatches(output, re.compile('^hello$', re.MULTILINE))
          self.assertRegexpMatches(output, re.compile('^world$', re.MULTILINE))
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import os.path
  import re
  import unittest
  
  from integration import *
  
  class TestCommand(IntegrationTest):
      def __init__(self, *args, **kwargs):
          IntegrationTest.__init__(
              self, os.path.join(examples_dir, '06_commands'), *args, **kwargs
          )
  
      def test_hello(self):
          self.assertRegexpMatches(
              self.build('hello'),
              re.compile('^hello$', re.MULTILINE)
          )
  
      def test_world(self):
          self.assertRegexpMatches(
              self.build('world'),
              re.compile('^world$', re.MULTILINE)
          )
  
      def test_script(self):
          self.assertRegexpMatches(
              self.build('script'),
              re.compile('^hello, world!$', re.MULTILINE)
          )
          self.assertTrue(os.path.exists(os.path.join(self.builddir, 'file')))
  
      def test_alias(self):
          output = self.build('hello-world')
          self.assertRegexpMatches(output, re.compile('^hello$', re.MULTILINE))
          self.assertRegexpMatches(output, re.compile('^world$', re.MULTILINE))
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Fix typo