Improve labeled chest caching interactions

tests/test_sneak_placement.py

@@ -0,0 +1,40 @@
+import unittest
+from munch import Munch
+
+from minecraft.networking.modern import ClientTickEnd, UseItemOnBlockPacket
+from mosfet.game import Game
+from mosfet.protocol.modern import PlayerInputPacket
+
+
+class FakeConnection:
+    def __init__(self):
+        self.packets = []
+
+    def write_packet(self, packet, force=False):
+        self.packets.append((packet, force))
+
+
+class SneakPlacementTests(unittest.TestCase):
+    def test_sneaking_wraps_block_placement_and_is_released(self):
+        connection = FakeConnection()
+        game = Game.__new__(Game)
+        game.g = Munch(connection=connection)
+        game.sequence = 0
+
+        game.place_block((3, 64, 7), 1, sneaking=True)
+
+        packets = [packet for packet, _force in connection.packets]
+        self.assertEqual(len(packets), 6)
+        self.assertIsInstance(packets[0], PlayerInputPacket)
+        self.assertEqual(packets[0].flags, 0x20)
+        self.assertIsInstance(packets[1], ClientTickEnd)
+        self.assertIsInstance(packets[2], UseItemOnBlockPacket)
+        self.assertEqual(packets[2].location, (3, 64, 7))
+        self.assertIsInstance(packets[3], ClientTickEnd)
+        self.assertIsInstance(packets[4], PlayerInputPacket)
+        self.assertEqual(packets[4].flags, 0)
+        self.assertIsInstance(packets[5], ClientTickEnd)
+
+
+if __name__ == '__main__':
+    unittest.main()