如何在vue3组件测试中修改pinia中state的值，并影响到组件？

Question

使用vue-test-utils对使用pinia的组件进行测试，需要对pinia所存state的值进行修改，但试了很多方法都没有效果。原组件和store文件如下：

// HelloWorld.vue
<template>
    <h1>{{ title }}</h1>
</template>

<script>
import { useTestStore } from "@/stores/test";
import { mapState } from "pinia";

export default {
    name: "HelloWorld",
    
    computed: {
        ...mapState(useTestStore, ["title"]),
    },
};
</script>

// @/stores/test.js
import { defineStore } from "pinia";

export const useTestStore = defineStore("test", {
    state: () => {
        return { title: "hhhhh" };
    },
});

已经试过下面的方法：

1. 在测试代码中引入组件内用到的store，并直接进行修改，但改动无法影响到组件；

   // test.spec.js
   import { mount } from "@vue/test-utils";
   import { createTestingPinia } from "@pinia/testing";
   import HelloWorld from "@/components/HelloWorld.vue";
   import { useTestStore } from "@/stores/test";
   
   test("pinia in component test", () => {
    const wrapper = mount(HelloWorld, {
        global: {
            plugins: [createTestingPinia()],
        },
    });
    const store = useTestStore();
    store.title = "xxxxx";
   
    console.log(wrapper.text()) //仍然是"hhhhh";
   });

2. 使用createTestingPinia参数中的initialState，企图覆盖原store的内容，但是同样没有任何效果；

   // test.spec.js
   import { mount } from "@vue/test-utils";
   import { createTestingPinia } from "@pinia/testing";
   import HelloWorld from "@/components/HelloWorld.vue";
   
   test("pinia in component test", () => {
    const wrapper = mount(HelloWorld, {
        global: {
            plugins: [createTestingPinia({ initialState: { title: "xxxxx" } })],
        },
    });
    console.log(wrapper.text()) //仍然是"hhhhh";
   });

3. 在测试代码中对传入mount函数参数中global.plugins的TestingPinia对象进行操作，但是同样无效；

   // test.spec.js
   import { mount } from "@vue/test-utils";
   import { createTestingPinia } from "@pinia/testing";
   import HelloWorld from "@/components/HelloWorld.vue";
   
   test("pinia in component test", () => {
    const pinia = createTestingPinia();
    pinia.state.value.title = "xxxxx";
    const wrapper = mount(HelloWorld, {
        global: {
            plugins: [pinia],
        },
    });
    console.log(wrapper.text()) //仍然是"hhhhh";
   });
   

4. 使用mount函数参数中的global.mocks，把组件内使用到的state用mocks模拟，但这一方法仅对组件里使用setup传入的state有效，而使用mapState传入的则一样没有效果。

   // test.spec.js
   import { mount } from "@vue/test-utils";
   import { createTestingPinia } from "@pinia/testing";
   import HelloWorld from "@/components/HelloWorld.vue";
   
   test("pinia in component test", () => {
    const wrapper = mount(HelloWorld, {
        global: {
            plugins: [createTestingPinia()],
            mocks: { title: "xxxxx" },
        },
    });
    console.log(wrapper.text()) 
    //仍然是"hhhhh"，
    //但如果组件内的state是通过setup传入的，则是"xxxxx";
   });
   

请问对于使用mapState传入state的组件，有什么可行的方法做到在测试中改变组件内的state值吗？还是说我的测试思路错了？

Answer 1

已经使用jest.mock()解决。

import { mount } from "@vue/test-utils";
import { createPinia } from "pinia";
import HelloWorld from "@/components/HelloWorld.vue";

jest.mock("@/stores/test", () => {
    const { defineStore } = require("pinia");
    const useTestStore = defineStore("test", { state: () => ({ title: "xxxxx" }) });
    return { useTestStore };
});

test("pinia in component test", () => {
    const wrapper = mount(HelloWorld, {
        global: { plugins: [createPinia()] },
    });
    expect(wrapper.text()).toBe("xxxxx");
});