test: add trailing slash to base

packages/vite/src/node/__tests__/utils.spec.ts

@@ -1,4 +1,5 @@
 import fs from 'node:fs'
+import path from 'node:path'
 import { describe, expect, test } from 'vitest'
 import {
   asyncFlatten,
@@ -9,6 +10,7 @@ import {
   isFileReadable,
   isWindows,
   posToNumber,
+  processSrcSetSync,
   resolveHostname,
   shouldServe
 } from '../utils'
@@ -270,3 +272,15 @@ describe('isFileReadable', () => {
     })
   }
 })
+
+describe('processSrcSetSync', () => {
+  test('replace srcset with base url /base/', async () => {
+    const devBase = '/base/'
+    expect(
+      processSrcSetSync(
+        './nested/asset.png 1x, ./nested/asset.png 2x',
+        ({ url }) => path.posix.join(devBase, url)
+      )
+    ).toBe('/base/nested/asset.png 1x, /base/nested/asset.png 2x')
+  })
+})