'``InstallApplication.run`` installs the supplied application in the
``target_path``.'

def test_run(self):

    package_uri = 'http://www.example.com/Bar-1.2.3.whl'
    fake_env = SpyVirtualEnv()
    InstallApplication(virtualenv=fake_env, package_uri=package_uri).run()
    self.assertEqual([package_uri], fake_env._installed_packages)
