def test_merge(self):
a = Counter(value=5)
b = Counter(value=5)
b.increment(3)
b.increment(2)
a.increment(2)
c = Counter.merge(a, b)
self.assertEqual(c.current, 12)
self.assertEqual(c._increment, 7)
self.assertEqual(c._vclock, 3)
self.assertTrue(c.isdirty())
self.assertEqual(c.mutation(), {'increment': 7})
def test_merge_different_types(self):
c = Counter()
f = Flag()
r = Register()
s = Set()
m = Map()
tuples = [(Counter, c, f), (Flag, f, r), (Register, r, s), (Set, s, m),
(Map, m, c)]
for cls, a, b in tuples:
with self.assertRaises(TypeError):
cls.merge(a, b)
def test_increment(self):
crdt = Counter(value=5)
self.assertEqual(crdt.current, 5)
crdt.increment()
self.assertEqual(crdt.current, 6)
self.assertEqual(crdt._increment, 1)
self.assertEqual(crdt._vclock, 1)
self.assertTrue(crdt.isdirty())
self.assertEqual(crdt.mutation(), {'increment': 1})
crdt.decrement()
self.assertEqual(crdt.current, 5)
self.assertEqual(crdt._increment, 0)
self.assertEqual(crdt._vclock, 2)
self.assertFalse(crdt.isdirty())
self.assertEqual(crdt.mutation(), {'increment': 0})
def test_context(self):
m = Map()
Counter(context=m)
with self.assertRaises(TypeError):
Counter(context=42)
def test_default(self):
crdt = Counter()
self.assertEqual(crdt.current, 0)
def test_fail_type(self):
with self.assertRaises(TypeError):
Counter(value='not int')
def test_fail_merge(self):
a = Counter(value=5)
b = Counter(value=7)
with self.assertRaises(ValueError):
Counter.merge(a, b)
def create_counter(step, key, val):
counter = Counter()
counter.increment(int(val))
world.store[key] = counter