Vue.js Vue testutils 如何测试 router.push()

在我的组件中，我有一个方法可以执行一个router.push()

import router from "@/router";
// ...
export default {
  // ...
  methods: {
    closeAlert: function() {
      if (this.msgTypeContactForm == "success") {
        router.push("/home");
      } else {
        return;
      }
    },
    // ....
  }
}

我想测试一下...

我写了以下规格..

it("should ... go to home page", async () => {
    // given
    const $route = {
      name: "home"
    },
    options = {
      ...
      mocks: {
        $route
      }
    };
    wrapper = mount(ContactForm, options);
    const closeBtn = wrapper.find(".v-alert__dismissible");
    closeBtn.trigger("click");
    await wrapper.vm.$nextTick();
    expect(alert.attributes().style).toBe("display: none;")
    // router path '/home' to be called ?
  });

1-我出错了

console.error node_modules/@vue/test-utils/dist/vue-test-utils.js:15
[vue-test-utils]: could not overwrite property $route, this is usually caused by a plugin that has added the property asa read-only value

2-如何编写expect()以确保已调用此/主路由

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