diff --git a/packages/valory/skills/decision_maker_abci/tests/states/test_order_subscription.py b/packages/valory/skills/decision_maker_abci/tests/states/test_order_subscription.py
new file mode 100644
index 000000000..feb38e7fc
--- /dev/null
+++ b/packages/valory/skills/decision_maker_abci/tests/states/test_order_subscription.py
@@ -0,0 +1,101 @@
+# -*- coding: utf-8 -*-
+# ------------------------------------------------------------------------------
+#
+#   Copyright 2023-2024 Valory AG
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# ------------------------------------------------------------------------------
+
+import pytest
+from unittest.mock import MagicMock, patch
+from enum import Enum
+
+from packages.valory.skills.decision_maker_abci.states.base import Event
+from packages.valory.skills.decision_maker_abci.states.order_subscription import SubscriptionRound
+from packages.valory.skills.abstract_round_abci.base import BaseSynchronizedData
+
+# Dummy values for testing
+class MockSynchronizedData(BaseSynchronizedData):
+    def __init__(self, db):
+        super().__init__(db=db)
+        self.agreement_id = "dummy_agreement_id"
+
+    def update(self, **kwargs):
+        """Mock the update method to simulate updating agreement_id."""
+        updated_data = self.__class__(self.db.copy())
+        updated_data.__dict__.update(kwargs)
+        return updated_data
+
+@pytest.fixture
+def setup_subscription_round():
+    """Fixture to set up a basic SubscriptionRound instance."""
+    mock_synchronized_data = MockSynchronizedData(db={})
+    round_instance = SubscriptionRound(synchronized_data=mock_synchronized_data, context=MagicMock())
+    return round_instance
+
+def test_threshold_reached_with_error(setup_subscription_round):
+    """Test when the threshold is reached and the transaction is an error."""
+    round_instance = setup_subscription_round
+    with patch.object(SubscriptionRound, 'threshold_reached', new_callable=MagicMock(return_value=True)):
+        with patch.object(SubscriptionRound, 'most_voted_payload_values', new_callable=MagicMock(return_value=[None, round_instance.ERROR_PAYLOAD])):
+            result = round_instance.end_block()
+
+            assert result == (round_instance.synchronized_data, Event.SUBSCRIPTION_ERROR)
+
+def test_threshold_reached_with_no_tx(setup_subscription_round):
+    """Test when the threshold is reached and there's no transaction."""
+    round_instance = setup_subscription_round
+    with patch.object(SubscriptionRound, 'threshold_reached', new_callable=MagicMock(return_value=True)):
+        with patch.object(SubscriptionRound, 'most_voted_payload_values', new_callable=MagicMock(return_value=[None, round_instance.NO_TX_PAYLOAD])):
+            result = round_instance.end_block()
+
+            assert result == (round_instance.synchronized_data, Event.NO_SUBSCRIPTION)
+
+def test_threshold_reached_with_mock_tx(setup_subscription_round):
+    """Test when the threshold is reached and benchmarking mode is enabled."""
+    round_instance = setup_subscription_round
+    round_instance.context.benchmarking_mode.enabled = True
+    with patch.object(SubscriptionRound, 'threshold_reached', new_callable=MagicMock(return_value=True)):
+        with patch.object(SubscriptionRound, 'most_voted_payload_values', new_callable=MagicMock(return_value=[None, "mock_tx_hash"])):
+            result = round_instance.end_block()
+
+            assert result == (round_instance.synchronized_data, Event.MOCK_TX)
+
+def test_end_block_updates_sync_data(setup_subscription_round):
+    """Test if the agreement_id is correctly updated in synchronized data."""
+    round_instance = setup_subscription_round
+    
+    # Patch the `most_voted_payload_values` to return a list with the new agreement ID
+    with patch.object(SubscriptionRound, 'most_voted_payload_values', new_callable=MagicMock(return_value=[None, None, None, "new_agreement_id"])):
+        
+        # Call the `end_block` method to trigger the update
+        result = round_instance.end_block()
+
+        # Check the updated synchronized_data object returned by end_block
+        sync_data, event = result
+        
+        # Assert that the agreement_id was updated to the new_agreement_id
+        assert sync_data.agreement_id == "new_agreement_id"
+        assert event is not None
+
+def test_no_update_when_threshold_not_reached(setup_subscription_round):
+    """Test when the threshold is not reached, there should be no changes."""
+    round_instance = setup_subscription_round
+    with patch.object(SubscriptionRound, 'threshold_reached', new_callable=MagicMock(return_value=False)):
+        with patch("packages.valory.skills.decision_maker_abci.states.order_subscription.SubscriptionRound.end_block",
+                   return_value=None) as mock_super:
+            result = round_instance.end_block()
+
+        assert result is None
+        mock_super.assert_called_once()