@posva/pinia runs unit tests properly, but throws jest warnings and ts errors

Reproduction

yarn add @posva/pinia

test.spec.ts

it("calls a function from store", () => {
    // eslint-disable-next-line
    // @ts-ignore <--- by the way, the typescript error happens here: global does not exist on type...
    const wrapper = shallowMount(App, {  global: { plugins: [createTestingPinia()] } });

    // defined outside
    const store = useStore();

    wrapper.vm.$router.onReady(async () => {
      expect(store.fetchList).toHaveBeenCalled();
      // test succeeded
    });
  });

Warnings from @vue/test-utils

[Vue warn]: Injection "Symbol(pinia)" not found

TS error for global property:

Object literal may only specify known properties, and 'global' does not exist in type 'FunctionalComponentShallowMountOptions<Vue>'

Steps to reproduce the behavior

1. Define a store using defineStore
2. Define an action in actions
3. Create a testing file test.spec.ts
4. Write a test similar to above using Vue 2 environment that is described above
5. See the warning/ts-error

Expected behavior

No TS error, no jest warnings

Actual behavior

TS throws an error on using global prop within shallowMount method from @vue/test-utils Jest throws warnings [Vue warn]: Injection "Symbol(pinia)" not found

Additional information

Env:

“@pinia/testing”: “0.0.2”, “pinia”: “0.5.4”, “vue”: “2.6.14”,

[posva]

Oh well, that’s pretty neat it just works! The type issue needs to be fixed #630, it shouldn’t be a necessary step for users. Ideally without any extra type file, mixing Vue 3 and Vue 2 types together, if that’s not an issue for TypeScript. If that’s not possible, having a separate file for Vue 2 types would be enough pinia/vue-2-types. I will still have to think about it but I’m open to proposals

[posva]

Currently, @pinia/testing only officialy supports Vue 3. For Vue 2, You need pinia@2 (it works with Vue 2 but devtools need an upstream fix) and to adapt your tests to use the vue-test-utils for Vue 2 too.

I added this to my list of things to document for the testing pinia but I haven’t even tested it yet so it might require some changes to @pinia/testing. Based on https://vue-test-utils.vuejs.org/api/options.html#other-options, you probably need

localVue.use(PiniaPlugin)
const pinia = createTestingPinia()
const wrapper = mount(Component, {localVue, pinia})

Feel free to PR if you find anything missing/broken.