diff --git a/etl/hubspot/tests/test_hubspot_deal_differ.py b/etl/hubspot/tests/test_hubspot_deal_differ.py
index e57007684..a241c5189 100644
--- a/etl/hubspot/tests/test_hubspot_deal_differ.py
+++ b/etl/hubspot/tests/test_hubspot_deal_differ.py
@@ -746,6 +746,32 @@ def test_abri_tenant_data_fetch__non_abri_deal__returns_false() -> None:
     assert result is False
 
 
+def test_abri_tenant_data_fetch__commencement_date_already_set__returns_false() -> None:
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date=datetime(2026, 7, 1, tzinfo=timezone.utc),
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        project_code="Abri Condition",
+        expected_commencement_date="2026-08-01",
+    )
+
+    # Act
+    result = HubspotDealDiffer.check_for_abri_tenant_data_fetch(
+        new_deal=new_deal,
+        new_project=None,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is False
+
+
 # =======================
 # DB UPDATE TRIGGER TESTS
 # =======================