test: add failing cases for vehicle recharge apply withdraw

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_pl_vehicle_recharge_workflow.py

@@ -353,3 +353,112 @@ def test_approve_forbidden_on_disburse_node(monkeypatch):
             db, "t1", _user("u-fin", "财务"), "apply-1", opinion="ok"
         )
     assert exc.value.status_code == 400
+
+
+def test_withdraw_in_approval_to_draft_keeps_round_and_approvals(monkeypatch):
+    from app.services import pl_vehicle_recharge_service as svc
+
+    db = _make_session()
+    _seed_vehicle(db)
+    wf_id, node_gm, _node_fin = _seed_workflow(db)
+    db.add(
+        PlVehicleRechargeApply(
+            id="a-wd",
+            apply_no="SXSQWD001",
+            license_plate="鄂A00001",
+            recharge_type="etc",
+            apply_date=date.today(),
+            applicant_id="u-applicant",
+            status="in_approval",
+            wf_id=wf_id,
+            current_node=node_gm,
+            approval_round=1,
+            tenant_no="t1",
+            create_dept_id="d1",
+        )
+    )
+    db.add(
+        PlVehicleRechargeApproval(
+            id="ap1",
+            apply_id="a-wd",
+            node_id=node_gm,
+            node_name="总经理审批",
+            approval_round=1,
+            approval_status="approved",
+            approver_id="u-gm",
+            approver_name="总经理",
+            approval_time=datetime.now(),
+            tenant_no="t1",
+            create_dept_id="d1",
+        )
+    )
+    db.commit()
+    _patch_scope(monkeypatch, svc)
+
+    out = svc.withdraw_apply(db, "t1", _user("u-applicant"), "a-wd")
+    assert out.status == "draft"
+    assert out.currentNode in (None, "")
+    row = db.query(PlVehicleRechargeApply).filter_by(id="a-wd").one()
+    assert row.status == "draft"
+    assert row.current_node is None
+    assert row.approval_round == 1
+    assert (
+        db.query(PlVehicleRechargeApproval)
+        .filter_by(apply_id="a-wd", del_flag=0)
+        .count()
+        == 1
+    )
+
+
+def test_withdraw_rejects_non_applicant(monkeypatch):
+    from fastapi import HTTPException
+    from app.services import pl_vehicle_recharge_service as svc
+
+    db = _make_session()
+    _seed_vehicle(db)
+    db.add(
+        PlVehicleRechargeApply(
+            id="a-wd2",
+            apply_no="SXSQWD002",
+            license_plate="鄂A00001",
+            recharge_type="etc",
+            apply_date=date.today(),
+            applicant_id="u-applicant",
+            status="in_approval",
+            tenant_no="t1",
+            create_dept_id="d1",
+        )
+    )
+    db.commit()
+    _patch_scope(monkeypatch, svc)
+
+    with pytest.raises(HTTPException) as ei:
+        svc.withdraw_apply(db, "t1", _user("u-other"), "a-wd2")
+    assert ei.value.status_code == 403
+
+
+def test_withdraw_rejects_non_in_approval(monkeypatch):
+    from fastapi import HTTPException
+    from app.services import pl_vehicle_recharge_service as svc
+
+    db = _make_session()
+    _seed_vehicle(db)
+    db.add(
+        PlVehicleRechargeApply(
+            id="a-wd3",
+            apply_no="SXSQWD003",
+            license_plate="鄂A00001",
+            recharge_type="etc",
+            apply_date=date.today(),
+            applicant_id="u-applicant",
+            status="draft",
+            tenant_no="t1",
+            create_dept_id="d1",
+        )
+    )
+    db.commit()
+    _patch_scope(monkeypatch, svc)
+
+    with pytest.raises(HTTPException) as ei:
+        svc.withdraw_apply(db, "t1", _user("u-applicant"), "a-wd3")
+    assert ei.value.status_code == 400