2 files changed, 79 insertions, 0 deletions
diff --git a/tests/storage/test_background_update.py b/tests/storage/test_background_update.py
new file mode 100644
index 0000000000..29289fa9b4
--- /dev/null
+++ b/tests/storage/test_background_update.py
@@ -0,0 +1,76 @@
+from tests import unittest
+from twisted.internet import defer
+
+from synapse.api.constants import EventTypes
+from synapse.types import UserID, RoomID, RoomAlias
+
+from tests.utils import setup_test_homeserver
+
+from mock import Mock
+
+class BackgroundUpdateTestCase(unittest.TestCase):
+
+    @defer.inlineCallbacks
+    def setUp(self):
+        hs = yield setup_test_homeserver()
+        self.store = hs.get_datastore()
+        self.clock = hs.get_clock()
+
+        self.update_handler = Mock()
+
+        yield self.store.register_background_update_handler(
+            "test_update", self.update_handler
+        )
+
+    @defer.inlineCallbacks
+    def test_do_background_update(self):
+        desired_count = 1000;
+        duration_ms = 42;
+
+        @defer.inlineCallbacks
+        def update(progress, count):
+            self.clock.advance_time_msec(count * duration_ms)
+            progress = {"my_key": progress["my_key"] + 1}
+            yield self.store.runInteraction(
+                "update_progress",
+                self.store._background_update_progress_txn,
+                "test_update",
+                progress,
+            )
+            defer.returnValue(count)
+
+        self.update_handler.side_effect = update
+
+        yield self.store.start_background_update("test_update", {"my_key": 1})
+
+        self.update_handler.reset_mock()
+        result = yield self.store.do_background_update(
+            duration_ms * desired_count
+        )
+        self.assertIsNotNone(result)
+        self.update_handler.assert_called_once_with(
+            {"my_key": 1}, self.store.DEFAULT_BACKGROUND_BATCH_SIZE
+        )
+
+        @defer.inlineCallbacks
+        def update(progress, count):
+            yield self.store._end_background_update("test_update")
+            defer.returnValue(count)
+
+        self.update_handler.side_effect = update
+
+        self.update_handler.reset_mock()
+        result = yield self.store.do_background_update(
+            duration_ms * desired_count
+        )
+        self.assertIsNotNone(result)
+        self.update_handler.assert_called_once_with(
+            {"my_key": 2}, desired_count
+        )
+
+        self.update_handler.reset_mock()
+        result = yield self.store.do_background_update(
+            duration_ms * desired_count
+        )
+        self.assertIsNone(result)
+        self.assertFalse(self.update_handler.called)
diff --git a/tests/utils.py b/tests/utils.py
index ca2c33cf8e..91040c2efd 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -243,6 +243,9 @@ class MockClock(object):
             else:
                 self.timers.append(t)
 
+    def advance_time_msec(self, ms):
+        self.advance_time(ms / 1000.)
+
 
 class SQLiteMemoryDbPool(ConnectionPool, object):
     def __init__(self):