def test_remaining(self):
dg = Datagram()
dg.add_uint16(25)
dg.add_int64(-354843598374)
dgi = dg.iterator()
self.assertEqual(dgi.remaining(), 10)
s = 'remaining unit test'
dg.add_string32(s.encode('utf-8'))
self.assertEqual(dgi.remaining(), 10 + 4 + len(s))
self.assertEqual(dgi.get_uint16(), 25)
self.assertEqual(dgi.remaining(), 8 + 4 + len(s))
dgi.seek(dg.get_length())
self.assertEqual(dgi.remaining(), 0)
dgi.seek(0)
self.assertEqual(dgi.remaining(), 10 + 4 + len(s))
dgi.seek(14)
self.assertEqual(dgi.remaining(), len(s))
dgi.seek(999)
self.assertEqual(dgi.remaining(), 0)
def test_get(self):
dg = Datagram()
dg.add_uint16(25)
dg.add_int64(-354843598374)
dg.add_string32('datagram iterator test'.encode('utf-8'))
dgi = dg.iterator()
self.assertEqual(dgi.get_uint16(), 25)
self.assertEqual(dgi.get_int64(), -354843598374)
self.assertEqual(dgi.get_string32(), 'datagram iterator test')
def test_overwrite(self):
dg = Datagram()
dg.add_uint32(2828)
pos = dg.tell()
self.assertEqual(pos, 4)
dg.add_uint16(24)
dg.add_int64(-352793)
dg.seek(pos)
dg.add_uint16(5000)
dg.seek(len(dg))
dg.add_string32(b'overwrite')
dgi = dg.iterator()
self.assertEqual(dgi.get_uint32(), 2828)
self.assertEqual(dgi.get_uint16(), 5000)
self.assertEqual(dgi.get_int64(), -352793)
self.assertEqual(dgi.get_string32(), 'overwrite')