# File test/test_pseudo_io.rb, line 65
    def test_close
      assert(! @io.closed?)
      @io.write('hello world.')
      assert_equal('hello world.', @io.read)
      @io.close
      assert(@io.closed?)
      assert_exception(RuntimeError) { @io.write('hello world.') }
      assert_exception(RuntimeError) { @io.read }
    end