feat: add tests for deal stage rollback and forward transitions for owner and member roles

tests/services/test_deal_service.py

@@ -163,6 +163,57 @@ async def test_stage_rollback_allowed_for_admin(session: AsyncSession) -> None:
     assert updated.stage == DealStage.PROPOSAL
 
 
+@pytest.mark.asyncio
+async def test_stage_rollback_allowed_for_owner(session: AsyncSession) -> None:
+    context, contact, repo = await _persist_base(session, role=OrganizationRole.OWNER)
+    service = DealService(repository=repo)
+
+    deal = await service.create_deal(
+        DealCreate(
+            organization_id=context.organization_id,
+            contact_id=contact.id,
+            owner_id=context.user_id,
+            title="Owner Rollback",
+            amount=Decimal("2500"),
+        ),
+        context=context,
+    )
+    deal.stage = DealStage.CLOSED
+
+    updated = await service.update_deal(
+        deal,
+        DealUpdateData(stage=DealStage.NEGOTIATION),
+        context=context,
+    )
+
+    assert updated.stage == DealStage.NEGOTIATION
+
+
+@pytest.mark.asyncio
+async def test_stage_forward_allowed_for_member(session: AsyncSession) -> None:
+    context, contact, repo = await _persist_base(session, role=OrganizationRole.MEMBER)
+    service = DealService(repository=repo)
+
+    deal = await service.create_deal(
+        DealCreate(
+            organization_id=context.organization_id,
+            contact_id=contact.id,
+            owner_id=context.user_id,
+            title="Forward Move",
+            amount=Decimal("1000"),
+        ),
+        context=context,
+    )
+
+    updated = await service.update_deal(
+        deal,
+        DealUpdateData(stage=DealStage.PROPOSAL),
+        context=context,
+    )
+
+    assert updated.stage == DealStage.PROPOSAL
+
+
 @pytest.mark.asyncio
 async def test_status_won_requires_positive_amount(session: AsyncSession) -> None:
     context, contact, repo = await _persist_base(session)