'Happy path for value that\'s a string.'

def test_map_value_parse(self):

    schema = {'Type': 'Json'}
    val = {'foo': 'bar', 'items': [1, 2, 3]}
    val_s = json.dumps(val)
    p = new_parameter('p', schema, val_s)
    self.assertEqual(val, p.value())
    self.assertEqual(val, p.parsed)
