test: add vue suspense test (vitest-dev#290)

test/vue/components/AsyncComp.vue

@@ -0,0 +1,9 @@
+<script setup lang="ts">
+const props = defineProps<{ promise: Promise<void> }>()
+
+await props.promise
+</script>
+
+<template>
+  <div>resolved</div>
+</template>

test/vue/components/AsyncWrapper.vue

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+<script setup lang="ts">
+import AsyncComp from './AsyncComp.vue'
+
+defineProps<{ promise: Promise<void> }>()
+</script>
+
+<template>
+  <Suspense>
+    <AsyncComp :promise="promise" />
+    <template #fallback>
+      fallback
+    </template>
+  </Suspense>
+</template>

test/vue/test/async.test.ts

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+import { nextTick } from 'vue'
+import { flushPromises, mount } from '@vue/test-utils'
+import AsyncWrapper from '../components/AsyncWrapper.vue'
+
+test('async component with suspense', async() => {
+  expect(AsyncWrapper).toBeTruthy()
+
+  let resolve: Function
+  // eslint-disable-next-line promise/param-names
+  const promise = new Promise(_resolve => resolve = _resolve)
+  const wrapper = mount(AsyncWrapper, {
+    props: {
+      promise,
+    },
+  })
+
+  await nextTick()
+
+  expect(wrapper.text()).toContain('fallback')
+
+  resolve()
+
+  await flushPromises()
+  await nextTick()
+  await nextTick()
+
+  const text = wrapper.text()
+  expect(text).toContain('resolved')
+})

test/vue/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "target": "esnext"
+  }
+}