new_contents: from pim.commands.init import _defaults, _make_package
  from pim.commands.install import install
  from pim.commands.uninstall import uninstall
  
  from click.testing import CliRunner
  
  def _create_test_package():
      d = _defaults()
      d['description'] = 'test package'
      _make_package(d, True)
      return d
  
  def test_install_and_uninstall():
      pkg_to_install = 'nose'
      runner = CliRunner()
      with runner.isolated_filesystem():
          d = _create_test_package()
          result = runner.invoke(install, ['-g', pkg_to_install])
          # _install([pkg_to_install], globally=True)
          with open('requirements.txt', 'r') as f:
              lines = f.readlines()
          assert pkg_to_install in lines
  
          result = runner.invoke(uninstall, ['-g', pkg_to_install])
          with open('requirements.txt', 'r') as f:
              lines = f.readlines()
          assert pkg_to_install not in lines
  
subject: Create test package and round trip install/uninstall