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Tests for the WO MCP server (issue #12).
Covers:
- list_fault_records: happy path, transformer filter, status filter (with na=False guard)
- get_fault_record: known ID, missing ID
- create_work_order: happy path, invalid priority
- list_work_orders: session filtering by transformer/status/priority
- update_work_order: status, priority, assignee, notes; invalid WO ID, invalid status
- estimate_downtime: all four severities, invalid severity
WO response contract for harness authors (see also #12):
- work_order_id format: "WO-{8 hex chars uppercase}", e.g. "WO-A1B2C3D4"
- created_at is UTC ISO-8601 with trailing "Z"
- assigned_technician is null until explicitly set via update_work_order
- notes is a list; each entry has "timestamp" and "text" keys
- _work_orders is session-scoped (in-memory); each test run gets a fresh session
only if the module is re-imported — tests within one run share state, so we
use unique transformer IDs per test to avoid cross-contamination.
"""
import sys
from pathlib import Path
import pytest
sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
import mcp_servers.wo_server.server as wo_mod
from mcp_servers.wo_server.server import (
create_work_order,
estimate_downtime,
get_fault_record,
list_fault_records,
list_work_orders,
update_work_order,
)
@pytest.fixture(autouse=True)
def clear_work_orders():
"""Reset the in-memory WO store before each test."""
wo_mod._work_orders.clear()
yield
wo_mod._work_orders.clear()
# ---------------------------------------------------------------------------
# list_fault_records
# ---------------------------------------------------------------------------
def test_list_fault_records_returns_list():
result = list_fault_records()
assert isinstance(result, list)
assert len(result) > 0
def test_list_fault_records_default_limit():
result = list_fault_records()
assert len(result) <= 20
def test_list_fault_records_transformer_filter():
result = list_fault_records(transformer_id="T-018")
assert isinstance(result, list)
assert all(r["transformer_id"] == "T-018" for r in result)
def test_list_fault_records_status_filter():
result = list_fault_records(maintenance_status="Completed")
assert isinstance(result, list)
# All returned records should match (case-insensitive)
assert all(r["maintenance_status"].lower() == "completed" for r in result)
def test_list_fault_records_status_filter_no_crash_on_na():
# Should not raise even if maintenance_status has NaN values in real data
result = list_fault_records(maintenance_status="Scheduled")
assert isinstance(result, list)
def test_list_fault_records_limit():
result = list_fault_records(limit=5)
assert len(result) <= 5
def test_list_fault_records_limit_capped():
result = list_fault_records(limit=9999)
assert len(result) <= 100
# ---------------------------------------------------------------------------
# get_fault_record
# ---------------------------------------------------------------------------
def test_get_fault_record_known():
records = list_fault_records(limit=1)
assert len(records) > 0
fault_id = records[0]["fault_id"]
result = get_fault_record(fault_id)
assert "error" not in result
assert result["fault_id"] == fault_id
def test_get_fault_record_missing():
result = get_fault_record("F-NONEXISTENT-999")
assert "error" in result
# ---------------------------------------------------------------------------
# create_work_order
# ---------------------------------------------------------------------------
def test_create_work_order_happy_path():
result = create_work_order("T-001", "Test fault description")
assert "error" not in result
for key in (
"work_order_id",
"transformer_id",
"issue_description",
"priority",
"fault_type",
"status",
"estimated_downtime_hours",
"created_at",
"assigned_technician",
):
assert key in result, f"Missing field: {key}"
assert result["transformer_id"] == "T-001"
assert result["status"] == "open"
assert result["assigned_technician"] is None
assert result["work_order_id"].startswith("WO-")
def test_create_work_order_default_priority():
result = create_work_order("T-002", "Default priority test")
assert result["priority"] == "medium"
def test_create_work_order_critical_priority():
result = create_work_order("T-003", "Critical fault", priority="critical")
assert result["priority"] == "critical"
# Typical downtime for critical is 72 hours
assert result["estimated_downtime_hours"] == 72
def test_create_work_order_invalid_priority():
result = create_work_order("T-004", "Bad priority", priority="urgent")
assert "error" in result
def test_create_work_order_custom_downtime():
result = create_work_order("T-005", "Custom downtime", estimated_downtime_hours=10)
assert result["estimated_downtime_hours"] == 10
# ---------------------------------------------------------------------------
# list_work_orders
# ---------------------------------------------------------------------------
def test_list_work_orders_empty():
result = list_work_orders()
assert result == []
def test_list_work_orders_after_create():
create_work_order("T-010", "WO list test")
result = list_work_orders()
assert len(result) == 1
def test_list_work_orders_filter_transformer():
create_work_order("T-011", "WO A")
create_work_order("T-012", "WO B")
result = list_work_orders(transformer_id="T-011")
assert len(result) == 1
assert result[0]["transformer_id"] == "T-011"
def test_list_work_orders_filter_status():
wo = create_work_order("T-013", "Status filter test")
wo_id = wo["work_order_id"]
update_work_order(wo_id, status="in_progress")
open_wos = list_work_orders(status="open")
in_progress = list_work_orders(status="in_progress")
assert all(w["status"] == "open" for w in open_wos)
assert all(w["status"] == "in_progress" for w in in_progress)
# ---------------------------------------------------------------------------
# update_work_order
# ---------------------------------------------------------------------------
def test_update_work_order_status():
wo = create_work_order("T-020", "Update status test")
wo_id = wo["work_order_id"]
result = update_work_order(wo_id, status="resolved")
assert result["status"] == "resolved"
def test_update_work_order_assign_technician():
wo = create_work_order("T-014", "Assign tech test")
wo_id = wo["work_order_id"]
result = update_work_order(wo_id, assigned_technician="TEC-02")
assert result["assigned_technician"] == "TEC-02"
def test_update_work_order_add_note():
wo = create_work_order("T-015", "Note test")
wo_id = wo["work_order_id"]
result = update_work_order(wo_id, note="Inspection completed")
assert len(result["notes"]) == 1
assert result["notes"][0]["text"] == "Inspection completed"
assert "timestamp" in result["notes"][0]
def test_update_work_order_invalid_status():
wo = create_work_order("T-016", "Invalid status test")
result = update_work_order(wo["work_order_id"], status="in_flight")
assert "error" in result
def test_update_work_order_missing_id():
result = update_work_order("WO-DOESNOTEXIST", status="open")
assert "error" in result
# ---------------------------------------------------------------------------
# estimate_downtime
# ---------------------------------------------------------------------------
@pytest.mark.parametrize(
"severity,expected_typical",
[
("low", 4),
("medium", 8),
("high", 24),
("critical", 72),
],
)
def test_estimate_downtime_severities(severity, expected_typical):
result = estimate_downtime("T-018", severity=severity)
assert "error" not in result
assert result["estimated_typical_hours"] == expected_typical
assert result["estimated_min_hours"] <= result["estimated_typical_hours"]
assert result["estimated_typical_hours"] <= result["estimated_max_hours"]
def test_estimate_downtime_invalid_severity():
result = estimate_downtime("T-018", severity="extreme")
assert "error" in result
def test_estimate_downtime_records_fault_type():
result = estimate_downtime("T-018", severity="high", fault_type="Arc Discharge")
assert result["fault_type"] == "Arc Discharge"
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