test: add vitest plugin snap test for async factory loading

Author: fengmk2

packages/cli/snap-tests/vite-plugins-async-test/my-vitest-plugin.ts

@@ -0,0 +1,14 @@
+export default function myVitestPlugin() {
+  return {
+    name: 'my-vitest-plugin',
+    config() {
+      return {
+        test: {
+          env: {
+            MY_VITEST_PLUGIN_LOADED: '1',
+          },
+        },
+      };
+    },
+  };
+}

packages/cli/snap-tests/vite-plugins-async-test/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "vite-plugins-async-test",
+  "private": true
+}

packages/cli/snap-tests/vite-plugins-async-test/snap.txt

@@ -0,0 +1,10 @@
+> vp test # async plugins factory should load vitest plugin with configureVitest hook
+ RUN  <cwd>
+
+ ✓ src/index.test.ts (1 test) <variable>ms
+
+ Test Files  1 passed (1)
+      Tests  1 passed (1)
+   Start at  <date>
+   Duration  <variable>ms (transform <variable>ms, setup <variable>ms, import <variable>ms, tests <variable>ms, environment <variable>ms)
+

packages/cli/snap-tests/vite-plugins-async-test/src/index.test.ts

@@ -0,0 +1,5 @@
+import { expect, test } from '@voidzero-dev/vite-plus-test';
+
+test('async plugin factory should load vitest plugin', () => {
+  expect(process.env.MY_VITEST_PLUGIN_LOADED).toBe('1');
+});

packages/cli/snap-tests/vite-plugins-async-test/steps.json

@@ -0,0 +1,5 @@
+{
+  "commands": [
+    "vp test # async plugins factory should load vitest plugin with configureVitest hook"
+  ]
+}

packages/cli/snap-tests/vite-plugins-async-test/vite.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from 'vite-plus';
+
+export default defineConfig({
+  plugins: async () => {
+    const { default: myVitestPlugin } = await import('./my-vitest-plugin');
+    return [myVitestPlugin()];
+  },
+});