refactor: add a svelte4 version of tests

tests/components/ct-svelte4/.gitignore

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+/node_modules/
+/public/build/
+/public/tests/
+
+.DS_Store

tests/components/ct-svelte4/README.md

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+*Psst — looking for a more complete solution? Check out [SvelteKit](https://kit.svelte.dev), the official framework for building web applications of all sizes, with a beautiful development experience and flexible filesystem-based routing.*
+
+*Looking for a shareable component template instead? You can [use SvelteKit for that as well](https://kit.svelte.dev/docs#packaging) or the older [sveltejs/component-template](https://github.com/sveltejs/component-template)*
+
+---
+
+# svelte app
+
+This is a project template for [Svelte](https://svelte.dev) apps. It lives at https://github.com/sveltejs/template.
+
+To create a new project based on this template using [degit](https://github.com/Rich-Harris/degit):
+
+```bash
+npx degit sveltejs/template svelte-app
+cd svelte-app
+```
+
+*Note that you will need to have [Node.js](https://nodejs.org) installed.*
+
+
+## Get started
+
+Install the dependencies...
+
+```bash
+cd svelte-app
+npm install
+```
+
+...then start [Rollup](https://rollupjs.org):
+
+```bash
+npm run dev
+```
+
+Navigate to [localhost:8080](http://localhost:8080). You should see your app running. Edit a component file in `src`, save it, and reload the page to see your changes.
+
+By default, the server will only respond to requests from localhost. To allow connections from other computers, edit the `sirv` commands in package.json to include the option `--host 0.0.0.0`.
+
+If you're using [Visual Studio Code](https://code.visualstudio.com/) we recommend installing the official extension [Svelte for VS Code](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode). If you are using other editors you may need to install a plugin in order to get syntax highlighting and intellisense.
+
+## Building and running in production mode
+
+To create an optimised version of the app:
+
+```bash
+npm run build
+```
+
+You can run the newly built app with `npm run start`. This uses [sirv](https://github.com/lukeed/sirv), which is included in your package.json's `dependencies` so that the app will work when you deploy to platforms like [Heroku](https://heroku.com).
+
+
+## Single-page app mode
+
+By default, sirv will only respond to requests that match files in `public`. This is to maximise compatibility with static fileservers, allowing you to deploy your app anywhere.
+
+If you're building a single-page app (SPA) with multiple routes, sirv needs to be able to respond to requests for *any* path. You can make it so by editing the `"start"` command in package.json:
+
+```js
+"start": "sirv public --single"
+```
+
+## Using TypeScript
+
+This template comes with a script to set up a TypeScript development environment, you can run it immediately after cloning the template with:
+
+```bash
+node scripts/setupTypeScript.js
+```
+
+Or remove the script via:
+
+```bash
+rm scripts/setupTypeScript.js
+```
+
+If you want to use `baseUrl` or `path` aliases within your `tsconfig`, you need to set up `@rollup/plugin-alias` to tell Rollup to resolve the aliases. For more info, see [this StackOverflow question](https://stackoverflow.com/questions/63427935/setup-tsconfig-path-in-svelte).
+
+## Deploying to the web
+
+### With [Vercel](https://vercel.com)
+
+Install `vercel` if you haven't already:
+
+```bash
+npm install -g vercel
+```
+
+Then, from within your project folder:
+
+```bash
+cd public
+vercel deploy --name my-project
+```
+
+### With [surge](https://surge.sh/)
+
+Install `surge` if you haven't already:
+
+```bash
+npm install -g surge
+```
+
+Then, from within your project folder:
+
+```bash
+npm run build
+surge public my-project.surge.sh
+```

tests/components/ct-svelte4/package.json

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+{
+  "name": "ct-svelte",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "build": "rollup -c",
+    "dev": "rollup -c -w",
+    "start": "sirv public --no-clear",
+    "typecheck": "tsc --noEmit"
+  },
+  "devDependencies": {
+    "@rollup/plugin-commonjs": "^17.0.0",
+    "@rollup/plugin-node-resolve": "^11.0.0",
+    "rollup": "^2.3.4",
+    "rollup-plugin-css-only": "^3.1.0",
+    "rollup-plugin-livereload": "^2.0.0",
+    "rollup-plugin-svelte": "^7.0.0",
+    "rollup-plugin-terser": "^7.0.0",
+    "sirv-cli": "^2.0.0"
+  },
+  "dependencies": {
+    "svelte": "^5.19.9"
+  }
+}

tests/components/ct-svelte4/playwright.config.ts

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+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { defineConfig, devices } from '@playwright/experimental-ct-svelte';
+import { resolve } from 'path';
+
+export default defineConfig({
+  testDir: 'tests',
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  reporter: process.env.CI ? 'html' : 'line',
+  use: {
+    trace: 'on-first-retry',
+    ctViteConfig: {
+      resolve: {
+        alias: {
+          '@': resolve(__dirname, './src'),
+        }
+      }
+    }
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+    {
+      name: 'firefox',
+      use: { ...devices['Desktop Firefox'] },
+    },
+    {
+      name: 'webkit',
+      use: { ...devices['Desktop Safari'] },
+    },
+  ],
+});

tests/components/ct-svelte4/playwright/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" href="/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Svelte Test</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="./index.ts"></script>
+  </body>
+</html>

tests/components/ct-svelte4/playwright/index.ts

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+// @ts-check
+import '../src/assets/index.css';
+import { beforeMount, afterMount } from '@playwright/experimental-ct-svelte/hooks';
+
+export type HooksConfig = {
+  route: string;
+}
+
+beforeMount<HooksConfig>(async ({ hooksConfig }) => {
+  console.log(`Before mount: ${JSON.stringify(hooksConfig)}`);
+});
+
+afterMount<HooksConfig>(async () => {
+  console.log(`After mount`);
+});

tests/components/ct-svelte4/public/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset='utf-8'>
+  <meta name='viewport' content='width=device-width,initial-scale=1'>
+
+  <title>Svelte app</title>
+
+  <link rel='icon' type='image/png' href='/favicon.png'>
+  <link rel='stylesheet' href='/build/bundle.css'>
+
+  <script defer src='/build/bundle.js'></script>
+</head>
+
+<body>
+</body>
+</html>

tests/components/ct-svelte4/rollup.config.js

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+import svelte from 'rollup-plugin-svelte';
+import commonjs from '@rollup/plugin-commonjs';
+import resolve from '@rollup/plugin-node-resolve';
+import livereload from 'rollup-plugin-livereload';
+import { terser } from 'rollup-plugin-terser';
+import css from 'rollup-plugin-css-only';
+
+const production = !process.env.ROLLUP_WATCH;
+
+function serve() {
+  let server;
+
+  function toExit() {
+    if (server) server.kill(0);
+  }
+
+  return {
+    writeBundle() {
+      if (server) return;
+      server = require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
+        stdio: ['ignore', 'inherit', 'inherit'],
+        shell: true
+      });
+
+      process.on('SIGTERM', toExit);
+      process.on('exit', toExit);
+    }
+  };
+}
+
+const prod = {
+  input: 'src/main.js',
+  output: {
+    sourcemap: true,
+    format: 'iife',
+    name: 'app',
+    file: 'public/build/bundle.js'
+  },
+  plugins: [
+    svelte({
+      compilerOptions: {
+        // enable run-time checks when not in production
+        dev: !production
+      }
+    }),
+    // we'll extract any component CSS out into
+    // a separate file - better for performance
+    css({ output: 'bundle.css' }),
+
+    // If you have external dependencies installed from
+    // npm, you'll most likely need these plugins. In
+    // some cases you'll need additional configuration -
+    // consult the documentation for details:
+    // https://github.com/rollup/plugins/tree/master/packages/commonjs
+    resolve({
+      browser: true,
+      dedupe: ['svelte']
+    }),
+    commonjs(),
+
+    // In dev mode, call `npm run start` once
+    // the bundle has been generated
+    !production && serve(),
+
+    // Watch the `public` directory and refresh the
+    // browser on changes when not in production
+    !production && livereload('public'),
+
+    // If we're building for production (npm run build
+    // instead of npm run dev), minify
+    production && terser()
+  ],
+  watch: {
+    clearScreen: false
+  }
+};
+
+const test = {
+  input: 'src/tests.js',
+  output: {
+    sourcemap: true,
+    format: 'iife',
+    name: 'app',
+    file: 'public/tests/bundle.js'
+  },
+  plugins: [
+    svelte({
+      compilerOptions: {
+        // enable run-time checks when not in production
+        dev: !production
+      }
+    }),
+    // we'll extract any component CSS out into
+    // a separate file - better for performance
+    css({ output: 'bundle.css' }),
+
+    // If you have external dependencies installed from
+    // npm, you'll most likely need these plugins. In
+    // some cases you'll need additional configuration -
+    // consult the documentation for details:
+    // https://github.com/rollup/plugins/tree/master/packages/commonjs
+    resolve({
+      browser: true,
+      dedupe: ['svelte']
+    }),
+    commonjs(),
+
+    // Watch the `public` directory and refresh the
+    // browser on changes when not in production
+    !production && livereload('public'),
+
+    // If we're building for production (npm run build
+    // instead of npm run dev), minify
+    production && terser()
+  ],
+  watch: {
+    clearScreen: false
+  },
+};
+
+export default [ prod, test ];