chore(tests): Add GitHub Actions for Vue 2 compatibility

.github/workflows/vue-2.yml

@@ -0,0 +1,17 @@
+on:
+  - pull_request
+  - push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: yarn
+      - run: yarn install --frozen-lockfile
+      - run: yarn add --dev vue@2 vuex@3 @vue/test-utils@1
+      - run: yarn test
+      - uses: codecov/codecov-action@v3

tests/index.spec.js

@@ -2,8 +2,21 @@
 const { Store } = require('../src')
 const Helper = require('./Helper')
 const { mount } = require('@vue/test-utils')
+const Vue = require('vue')
 const { mapState } = require('vuex')
 
+/**
+ * @param {{ store: Store }} options
+ */
+function vue2CompatibleMocks ({ store }) {
+  const mocks = { $store: store }
+  if (Vue.version < '3') {
+    return { mocks }
+  }
+
+  return { global: { mocks } }
+}
+
 describe('Store Mock', () => {
   it('work with no args', () => {
     expect(() => {
@@ -70,11 +83,10 @@ describe('Store Mock', () => {
         'module/nested/mmGetter': 3,
       },
     })
-    const mocks = { $store: store }
     /** @type {import('@vue/test-utils').Wrapper} */
     let wrapper
     beforeEach(() => {
-      wrapper = mount(Helper, { global: { mocks } })
+      wrapper = mount(Helper, vue2CompatibleMocks({ store }))
     })
 
     it('correctly maps state', () => {
@@ -120,7 +132,7 @@ describe('Store Mock', () => {
           render: () => null,
           computed: mapState('nonExistent', ['a']),
         },
-        { global: { mocks } },
+        vue2CompatibleMocks({ store }),
       )
       expect(() => {
         // eslint-disable-next-line no-unused-expressions