test: add maintenance-service-factory unit tests

Author: phoenix-server

test/unit/factories/maintenance-service-factory.spec.ts

@@ -0,0 +1,10 @@
+import { expect } from 'chai'
+
+import { MaintenanceService } from '../../../src/services/maintenance-service'
+import { createMaintenanceService } from '../../../src/factories/maintenance-service-factory'
+
+describe('createMaintenanceService', () => {
+  it('returns a MaintenanceService', () => {
+    expect(createMaintenanceService()).to.be.an.instanceOf(MaintenanceService)
+  })
+})