Reaktive Status-Proxy-Abfangung in Unit-Test-Harnesses

import { reactive, isReactive } from 'vue';
 
export function createMutationTracker(targetState) {
  const mutations = [];
  if (!isReactive(targetState)) {
    throw new TypeError('Target state must be reactive');
  }
 
  const spyProxy = new Proxy(targetState, {
    set(target, property, value, receiver) {
      mutations.push({ property, oldValue: target[property], newValue: value });
      return Reflect.set(target, property, value, receiver);
    }
  });
 
  return { spyProxy, getMutations: () => [...mutations] };
}