diff --git a/tests/test_state.py b/tests/test_state.py
new file mode 100644
index 0000000000..8d0251b1e7
--- /dev/null
+++ b/tests/test_state.py
@@ -0,0 +1,271 @@
+# -*- coding: utf-8 -*-
+from twisted.internet import defer
+from twisted.trial import unittest
+
+from synapse.state import StateHandler
+from synapse.storage.pdu import PduEntry
+from synapse.federation.pdu_codec import encode_event_id
+
+from collections import namedtuple
+
+from mock import Mock
+
+
+ReturnType = namedtuple(
+ "StateReturnType", ["new_branch", "current_branch"]
+)
+
+
+class StateTestCase(unittest.TestCase):
+ def setUp(self):
+ self.persistence = Mock(spec=[
+ "get_unresolved_state_tree",
+ "update_current_state",
+ "get_latest_pdus_in_context",
+ "get_current_state",
+ ])
+ self.replication = Mock(spec=["get_pdu"])
+
+ hs = Mock(spec=["get_datastore", "get_replication_layer"])
+ hs.get_datastore.return_value = self.persistence
+ hs.get_replication_layer.return_value = self.replication
+ hs.hostname = "bob.com"
+
+ self.state = StateHandler(hs)
+
+ @defer.inlineCallbacks
+ def test_new_state_key(self):
+ # We've never seen anything for this state before
+ new_pdu = new_fake_pdu_entry("A", "test", "mem", "x", None, 10)
+
+ self.persistence.get_unresolved_state_tree.return_value = (
+ ReturnType([new_pdu], [])
+ )
+
+ is_new = yield self.state.handle_new_state(new_pdu)
+
+ self.assertTrue(is_new)
+
+ self.persistence.get_unresolved_state_tree.assert_called_once_with(
+ new_pdu
+ )
+
+ self.assertEqual(1, self.persistence.update_current_state.call_count)
+
+ self.assertFalse(self.replication.get_pdu.called)
+
+ @defer.inlineCallbacks
+ def test_direct_overwrite(self):
+ # We do a direct overwriting of the old state, i.e., the new state
+ # points to the old state.
+
+ old_pdu = new_fake_pdu_entry("A", "test", "mem", "x", None, 10)
+ new_pdu = new_fake_pdu_entry("B", "test", "mem", "x", "A", 5)
+
+ self.persistence.get_unresolved_state_tree.return_value = (
+ ReturnType([new_pdu, old_pdu], [old_pdu])
+ )
+
+ is_new = yield self.state.handle_new_state(new_pdu)
+
+ self.assertTrue(is_new)
+
+ self.persistence.get_unresolved_state_tree.assert_called_once_with(
+ new_pdu
+ )
+
+ self.assertEqual(1, self.persistence.update_current_state.call_count)
+
+ self.assertFalse(self.replication.get_pdu.called)
+
+ @defer.inlineCallbacks
+ def test_power_level_fail(self):
+ # We try to update the state based on an outdated state, and have a
+ # too low power level.
+
+ old_pdu_1 = new_fake_pdu_entry("A", "test", "mem", "x", None, 10)
+ old_pdu_2 = new_fake_pdu_entry("B", "test", "mem", "x", None, 10)
+ new_pdu = new_fake_pdu_entry("C", "test", "mem", "x", "A", 5)
+
+ self.persistence.get_unresolved_state_tree.return_value = (
+ ReturnType([new_pdu, old_pdu_1], [old_pdu_2, old_pdu_1])
+ )
+
+ is_new = yield self.state.handle_new_state(new_pdu)
+
+ self.assertFalse(is_new)
+
+ self.persistence.get_unresolved_state_tree.assert_called_once_with(
+ new_pdu
+ )
+
+ self.assertEqual(0, self.persistence.update_current_state.call_count)
+
+ self.assertFalse(self.replication.get_pdu.called)
+
+ @defer.inlineCallbacks
+ def test_power_level_succeed(self):
+ # We try to update the state based on an outdated state, but have
+ # sufficient power level to force the update.
+
+ old_pdu_1 = new_fake_pdu_entry("A", "test", "mem", "x", None, 10)
+ old_pdu_2 = new_fake_pdu_entry("B", "test", "mem", "x", None, 10)
+ new_pdu = new_fake_pdu_entry("C", "test", "mem", "x", "A", 15)
+
+ self.persistence.get_unresolved_state_tree.return_value = (
+ ReturnType([new_pdu, old_pdu_1], [old_pdu_2, old_pdu_1])
+ )
+
+ is_new = yield self.state.handle_new_state(new_pdu)
+
+ self.assertTrue(is_new)
+
+ self.persistence.get_unresolved_state_tree.assert_called_once_with(
+ new_pdu
+ )
+
+ self.assertEqual(1, self.persistence.update_current_state.call_count)
+
+ self.assertFalse(self.replication.get_pdu.called)
+
+ @defer.inlineCallbacks
+ def test_power_level_equal_same_len(self):
+ # We try to update the state based on an outdated state, the power
+ # levels are the same and so are the branch lengths
+
+ old_pdu_1 = new_fake_pdu_entry("A", "test", "mem", "x", None, 10)
+ old_pdu_2 = new_fake_pdu_entry("B", "test", "mem", "x", None, 10)
+ new_pdu = new_fake_pdu_entry("C", "test", "mem", "x", "A", 10)
+
+ self.persistence.get_unresolved_state_tree.return_value = (
+ ReturnType([new_pdu, old_pdu_1], [old_pdu_2, old_pdu_1])
+ )
+
+ is_new = yield self.state.handle_new_state(new_pdu)
+
+ self.assertTrue(is_new)
+
+ self.persistence.get_unresolved_state_tree.assert_called_once_with(
+ new_pdu
+ )
+
+ self.assertEqual(1, self.persistence.update_current_state.call_count)
+
+ self.assertFalse(self.replication.get_pdu.called)
+
+ @defer.inlineCallbacks
+ def test_power_level_equal_diff_len(self):
+ # We try to update the state based on an outdated state, the power
+ # levels are the same but the branch length of the new one is longer.
+
+ old_pdu_1 = new_fake_pdu_entry("A", "test", "mem", "x", None, 10)
+ old_pdu_2 = new_fake_pdu_entry("B", "test", "mem", "x", None, 10)
+ old_pdu_3 = new_fake_pdu_entry("C", "test", "mem", "x", "A", 10)
+ new_pdu = new_fake_pdu_entry("D", "test", "mem", "x", "C", 10)
+
+ self.persistence.get_unresolved_state_tree.return_value = (
+ ReturnType([new_pdu, old_pdu_3, old_pdu_1], [old_pdu_2, old_pdu_1])
+ )
+
+ is_new = yield self.state.handle_new_state(new_pdu)
+
+ self.assertTrue(is_new)
+
+ self.persistence.get_unresolved_state_tree.assert_called_once_with(
+ new_pdu
+ )
+
+ self.assertEqual(1, self.persistence.update_current_state.call_count)
+
+ self.assertFalse(self.replication.get_pdu.called)
+
+ @defer.inlineCallbacks
+ def test_missing_pdu(self):
+ # We try to update state against a PDU we haven't yet seen,
+ # triggering a get_pdu request
+
+ # The pdu we haven't seen
+ old_pdu_1 = new_fake_pdu_entry("A", "test", "mem", "x", None, 10)
+
+ old_pdu_2 = new_fake_pdu_entry("B", "test", "mem", "x", None, 10)
+ new_pdu = new_fake_pdu_entry("C", "test", "mem", "x", "A", 20)
+
+ # The return_value of `get_unresolved_state_tree`, which changes after
+ # the call to get_pdu
+ tree_to_return = [ReturnType([new_pdu], [old_pdu_2])]
+
+ def return_tree(p):
+ return tree_to_return[0]
+
+ def set_return_tree(*args, **kwargs):
+ tree_to_return[0] = ReturnType(
+ [new_pdu, old_pdu_1], [old_pdu_2, old_pdu_1]
+ )
+
+ self.persistence.get_unresolved_state_tree.side_effect = return_tree
+
+ self.replication.get_pdu.side_effect = set_return_tree
+
+ is_new = yield self.state.handle_new_state(new_pdu)
+
+ self.assertTrue(is_new)
+
+ self.persistence.get_unresolved_state_tree.assert_called_with(
+ new_pdu
+ )
+
+ self.assertEquals(
+ 2, self.persistence.get_unresolved_state_tree.call_count
+ )
+
+ self.assertEqual(1, self.persistence.update_current_state.call_count)
+
+ @defer.inlineCallbacks
+ def test_new_event(self):
+ event = Mock()
+
+ state_pdu = new_fake_pdu_entry("C", "test", "mem", "x", "A", 20)
+
+ tup = ("pdu_id", "origin.com", 5)
+ pdus = [tup]
+
+ self.persistence.get_latest_pdus_in_context.return_value = pdus
+ self.persistence.get_current_state.return_value = state_pdu
+
+ yield self.state.handle_new_event(event)
+
+ self.assertLess(tup[2], event.depth)
+
+ self.assertEquals(1, len(event.prev_events))
+
+ prev_id = event.prev_events[0]
+
+ self.assertEqual(encode_event_id(tup[0], tup[1]), prev_id)
+
+ self.assertEqual(
+ encode_event_id(state_pdu.pdu_id, state_pdu.origin),
+ event.prev_state
+ )
+
+
+def new_fake_pdu_entry(pdu_id, context, pdu_type, state_key, prev_state_id,
+ power_level):
+ new_pdu = PduEntry(
+ pdu_id=pdu_id,
+ pdu_type=pdu_type,
+ state_key=state_key,
+ power_level=power_level,
+ prev_state_id=prev_state_id,
+ origin="example.com",
+ context="context",
+ ts=1405353060021,
+ depth=0,
+ content_json="{}",
+ unrecognized_keys="{}",
+ outlier=True,
+ is_state=True,
+ prev_state_origin="example.com",
+ have_processed=True,
+ )
+
+ return new_pdu
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