CreateSpiedClass.ts

export type Spied<T> = {
	[K in keyof T]: T[K] extends Function ? jasmine.Spy : T[K] extends object ? Spied<T[K]> : T[K];
};

export function spyOnClass<T, U1 extends unknown[]>(type: new (...tArg1: U1) => T, ...arg1: U1) {
	let spyOnFunctions = function <W>(obj: W): Spied<W> {
		Object.keys(obj).forEach(p => {
			if (!!obj && !arg1.some(a => obj[p] === a)) {
				if (obj[p] instanceof Function) {
					spyOn(obj, p as keyof W);
				}
				else if (!!obj[p] && typeof obj[p] === 'object') {
					obj[p] = spyOnFunctions(obj[p]);
				}
			}
		});
		return obj as Spied<W>;
	};
	let ctor = new type(...arg1 as U1);
	
	return spyOnFunctions(ctor);
};