'With just a value for its C{first} argument,
L{ServerProtocol.setScrollRegion} writes a control sequence with
that parameter, a parameter separator, and finally a C{b\'r\'}.'

def test_setScrollRegionJustFirst(self):

    self.protocol.setScrollRegion(first=1)
    self.assertEqual(self.transport.value(), ((self.CSI + '1;') + 'r'))
