diff --git a/minode/tests/test_structure.py b/minode/tests/test_structure.py
index 5d476d7..5488c53 100644
--- a/minode/tests/test_structure.py
+++ b/minode/tests/test_structure.py
@@ -1,9 +1,10 @@
 """Tests for structures"""
 import unittest
 import struct
+import time
 from binascii import unhexlify
 
-from minode import structure
+from minode import message, proofofwork, shared, structure
 
 
 # host pregenerated by pybitmessage.protocol.encodeHost()
@@ -13,6 +14,12 @@ sample_addr_data = unhexlify(
     '0000000060f420b3000000010000000000000001'
     '260753000201300000000000000057ae1f90')
 
+# data for an object with expires_time 1697063939
+# structure.Object(
+#     b'\x00' * 8, expires_time, 42, 1, 2, b'HELLO').to_bytes()
+sample_object_data = unhexlify(
+    '000000000000000000000000652724030000002a010248454c4c4f')
+
 
 class TestStructure(unittest.TestCase):
     """Testing structures serializing and deserializing"""
@@ -85,3 +92,33 @@ class TestStructure(unittest.TestCase):
 
         addr = structure.NetAddr(1, '2607:5300:201:3000::57ae', 8080, 1)
         self.assertEqual(addr.to_bytes()[8:], sample_addr_data[8:])
+
+    def test_object(self):
+        """Create and check objects"""
+        obj = structure.Object.from_message(
+            message.Message(b'object', sample_object_data))
+        self.assertEqual(obj.object_type, 42)
+        self.assertEqual(obj.stream_number, 2)
+        self.assertEqual(obj.expires_time, 1697063939)
+        self.assertEqual(obj.object_payload, b'HELLO')
+
+        obj = structure.Object(
+            b'\x00' * 8, int(time.time() + 3000000), 42, 1, 1, b'HELLO')
+        self.assertFalse(obj.is_valid())
+        obj.expires_time = int(time.time() - 11000)
+        self.assertFalse(obj.is_valid())
+
+        obj = structure.Object(
+            b'\x00' * 8, int(time.time() + 300), 42, 1, 2, b'HELLO')
+        vector = obj.vector
+        proofofwork._worker(obj)  # pylint: disable=protected-access
+        obj = shared.objects.popitem()[1]
+        self.assertNotEqual(obj.vector, vector)
+        self.assertFalse(obj.is_expired())
+        self.assertFalse(obj.is_valid())
+        shared.stream = 2
+        self.assertTrue(obj.is_valid())
+
+        obj.object_payload = \
+            b'TIGER, tiger, burning bright. In the forests of the night'
+        self.assertFalse(obj.is_valid())