old_contents: import sys
  import unittest
  
  from skeletor.config import Config
  
  from .helpers import nostdout
  
  
  class ConfigTests(unittest.TestCase):
      """ Argument Passing & Config Tests. """
  
      def setUp(self):
          self._old_sys_argv = sys.argv
          sys.argv = [self._old_sys_argv[0].replace('nosetests', 'skeletor')]
  
      def tearDown(self):
          sys.argv = self._old_sys_argv
  
      def should_exit_with_no_arguments(self):
          try:
              with nostdout():
                  Config()
          except SystemExit:
              assert True
  
      def test_name_gets_set(self):
          with nostdout():
              sys.argv = ['', '-n', 'hello_world']
              c = Config()
          self.assertEquals(c.project_name, 'hello_world')
  
new_contents: import sys
  import unittest
  
  from skeletor.config import Config
  
  from .helpers import nostdout
  
  
  class ConfigTests(unittest.TestCase):
      """ Argument Passing & Config Tests. """
  
      def setUp(self):
          self._old_sys_argv = sys.argv
          sys.argv = [self._old_sys_argv[0].replace('nosetests', 'skeletor')]
  
      def tearDown(self):
          sys.argv = self._old_sys_argv
  
      def should_exit_with_no_arguments(self):
          try:
              with nostdout():
                  Config()
          except SystemExit:
              assert True
  
      def ensure_valid_project_name(self):
          with nostdout():
              sys.argv = ['', '-n', 'this_is_valid']
              c = Config()
          self.assertEquals(c.project_name, 'this_is_valid')
          with nostdout():
              sys.argv = ['', '-n', 'Thisisvalid']
              c = Config()
          self.assertEquals(c.project_name, 'Thisisvalid')
  
      def should_exit_on_invalid_name(self):
          try:
              with nostdout():
                  sys.argv = ['', '-n', 'not-valid']
                  Config()
          except SystemExit:
              assert True
          try:
              with nostdout():
                  sys.argv = ['', '-n', 'not valid']
                  Config()
          except SystemExit:
              assert True
          try:
              with nostdout():
                  sys.argv = ['', '-n', 'not_valid-*']
                  Config()
          except SystemExit:
              assert True
  
subject: Test for valid and invalid project names