import { Injectable } from '@angular/core'; @Injectable() export class MockLogger { output: { log: any[], error: any[], warn: any[] } = { log: [], error: [], warn: [] }; log(value: any, ...rest: any[]) { this.output.log.push([value, ...rest]); } error(value: any, ...rest: any[]) { this.output.error.push([value, ...rest]); } warn(value: any, ...rest: any[]) { this.output.warn.push([value, ...rest]); } }