test: simplify playground/json/__tests__/ssr (#18701)

Author: hi-ogawa

packages/vite/src/node/ssr/__tests__/fixtures/json/test.json

@@ -0,0 +1,3 @@
+{
+  "hello": "this is json"
+}

packages/vite/src/node/ssr/__tests__/ssrLoadModule.spec.ts

@@ -1,5 +1,6 @@
 import { fileURLToPath } from 'node:url'
 import path from 'node:path'
+import fs from 'node:fs'
 import { stripVTControlCharacters } from 'node:util'
 import { expect, test } from 'vitest'
 import { createServer } from '../../server'
@@ -212,3 +213,27 @@ test('parse error', async () => {
     expect.unreachable()
   }
 })
+
+test('json', async () => {
+  const server = await createDevServer()
+  const mod = await server.ssrLoadModule('/fixtures/json/test.json')
+  expect(mod).toMatchInlineSnapshot(`
+    {
+      "default": {
+        "hello": "this is json",
+      },
+      "hello": "this is json",
+    }
+  `)
+
+  const source = fs.readFileSync(
+    path.join(root, 'fixtures/json/test.json'),
+    'utf-8',
+  )
+  const json = await server.ssrTransform(
+    `export default ${source}`,
+    null,
+    '/test.json',
+  )
+  expect(json?.code.length).toMatchInlineSnapshot(`61`)
+})

playground/json/__tests__/ssr/json-ssr.spec.ts

@@ -7,10 +7,7 @@
     "dev": "vite",
     "build": "vite build",
     "debug": "node --inspect-brk ../../packages/vite/bin/vite",
-    "preview": "vite preview",
-    "dev:ssr": "node server",
-    "serve:ssr": "NODE_ENV=production node server",
-    "debug:ssr": "node --inspect-brk server"
+    "preview": "vite preview"
   },
   "devDependencies": {
     "@vitejs/test-json-module": "file:./json-module",