Simplify dual tests

tests/package.json

@@ -3,7 +3,9 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "test": "playwright test"
+    "test": "pnpm test:dev && pnpm test:build",
+    "test:dev": "playwright test",
+    "test:build": "TEST_BUILD=true playwright test"
   },
   "devDependencies": {
     "@playwright/test": "^1.26.1",

tests/playground-vite-svelte/playground-vite-svelte.spec.js

@@ -1,20 +1,9 @@
 import { test, expect } from '@playwright/test'
-import { setupDevServer, setupPreviewServer } from '../testUtils.js'
+import { setup } from '../testUtils.js'
 
-test.describe('dev', () => {
-  setupDevServer()
+setup()
 
-  test('render the page', async ({ page }) => {
-    await page.goto('/')
-    expect(await page.locator('h1').textContent()).toBe('Svelte')
-  })
-})
-
-test.describe('build', () => {
-  setupPreviewServer()
-
-  test('render the page', async ({ page }) => {
-    await page.goto('/')
-    expect(await page.locator('h1').textContent()).toBe('Svelte')
-  })
+test('render the page', async ({ page }) => {
+  await page.goto('/')
+  expect(await page.locator('h1').textContent()).toBe('Svelte')
 })

tests/playground-vite-vue/playground-vite-vue.spec.js

@@ -1,20 +1,9 @@
 import { test, expect } from '@playwright/test'
-import { setupDevServer, setupPreviewServer } from '../testUtils.js'
+import { setup } from '../testUtils.js'
 
-test.describe('dev', () => {
-  setupDevServer()
+setup()
 
-  test('render the page', async ({ page }) => {
-    await page.goto('/')
-    expect(await page.locator('h1').textContent()).toBe('Vue')
-  })
-})
-
-test.describe('build', () => {
-  setupPreviewServer()
-
-  test('render the page', async ({ page }) => {
-    await page.goto('/')
-    expect(await page.locator('h1').textContent()).toBe('Vue')
-  })
+test('render the page', async ({ page }) => {
+  await page.goto('/')
+  expect(await page.locator('h1').textContent()).toBe('Vue')
 })

tests/testUtils.js

@@ -6,7 +6,18 @@ import treeKill from 'tree-kill'
 
 const killPid = promisify(treeKill)
 
-export function setupDevServer() {
+export const isDev = !process.env.TEST_BUILD
+export const isBuild = !!process.env.TEST_BUILD
+
+export function setup() {
+  if (isDev) {
+    setupDevServer()
+  } else {
+    setupPreviewServer()
+  }
+}
+
+function setupDevServer() {
   /** @type {import('execa').ExecaChildProcess<string>} */
   let cp
 
@@ -23,7 +34,7 @@ export function setupDevServer() {
   })
 }
 
-export function setupPreviewServer() {
+function setupPreviewServer() {
   /** @type {import('execa').ExecaChildProcess<string>} */
   let cp