old_contents: from spec import eq_, skip, Spec, raises, ok_
  
  from invoke.run import run
  from invoke.exceptions import Failure
  
  
  class Run(Spec):
      """run()"""
      def return_code_in_result(self):
          r = run("echo 'foo'")
          eq_(r.stdout, "foo\n")
          eq_(r.return_code, 0)
          eq_(r.exited, 0)
  
      def nonzero_return_code_for_failures(self):
          result = run("false", warn=True)
          eq_(result.exited, 1)
          result = run("goobypls", warn=True)
          eq_(result.exited, 127)
  
      @raises(Failure)
      def fast_failures(self):
          run("false")
  
      def run_acts_as_success_boolean(self):
          ok_(not run("false", warn=True))
          ok_(run("true"))
  
      def non_one_return_codes_still_act_as_False(self):
          ok_(not run("goobypls", warn=True))
  
      def warn_kwarg_allows_continuing_past_failures(self):
          eq_(run("false", warn=True).exited, 1)
  
new_contents: from spec import eq_, skip, Spec, raises, ok_, trap
  
  from invoke.run import run
  from invoke.exceptions import Failure
  
  
  class Run(Spec):
      """run()"""
      def return_code_in_result(self):
          r = run("echo 'foo'")
          eq_(r.stdout, "foo\n")
          eq_(r.return_code, 0)
          eq_(r.exited, 0)
  
      def nonzero_return_code_for_failures(self):
          result = run("false", warn=True)
          eq_(result.exited, 1)
          result = run("goobypls", warn=True)
          eq_(result.exited, 127)
  
      @raises(Failure)
      def fast_failures(self):
          run("false")
  
      def run_acts_as_success_boolean(self):
          ok_(not run("false", warn=True))
          ok_(run("true"))
  
      def non_one_return_codes_still_act_as_False(self):
          ok_(not run("goobypls", warn=True, hide=True))
  
      def warn_kwarg_allows_continuing_past_failures(self):
          eq_(run("false", warn=True).exited, 1)
  
      @trap
      def hide_kwarg_allows_hiding_output(self):
          run("echo 'foo'", hide=True)
          eq_(sys.stdall.getvalue(), "")
  
subject: Add test re: hide kwarg