chore: React Test Library experiments app (#1447)

* chore: React Test Library experiments app

* chore: fix lint

* chore: fix tests

Author: mdjastrzebski

.eslintignore

@@ -1,2 +1,3 @@
 flow-typed/
 build/
+experiments-rtl/

experiments-rtl/.babelrc

@@ -0,0 +1,8 @@
+{
+  "presets": [
+    "@babel/preset-typescript",
+    "@babel/preset-react",
+    "@babel/preset-env"
+  ],
+  "plugins": []
+}

experiments-rtl/.eslintrc.json

@@ -0,0 +1,3 @@
+{
+  "extends": "next/core-web-vitals"
+}

experiments-rtl/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

experiments-rtl/README.md

@@ -0,0 +1,34 @@
+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

experiments-rtl/jest-setup.js

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+import "@testing-library/jest-dom";

experiments-rtl/jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  testEnvironment: "jsdom",
+  setupFilesAfterEnv: ["<rootDir>/jest-setup.js"],
+};

experiments-rtl/next.config.js

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+/** @type {import('next').NextConfig} */
+const nextConfig = {}
+
+module.exports = nextConfig

experiments-rtl/package.json

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+{
+  "name": "react-testing-library-experiments",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "test": "jest",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "@types/node": "20.4.9",
+    "@types/react": "18.2.19",
+    "@types/react-dom": "18.2.7",
+    "autoprefixer": "10.4.14",
+    "eslint": "8.46.0",
+    "eslint-config-next": "13.4.13",
+    "next": "13.4.13",
+    "postcss": "8.4.27",
+    "react": "18.2.0",
+    "react-dom": "18.2.0",
+    "tailwindcss": "3.3.3",
+    "typescript": "5.1.6"
+  },
+  "devDependencies": {
+    "@babel/preset-env": "^7.22.10",
+    "@babel/preset-react": "^7.22.5",
+    "@babel/preset-typescript": "^7.22.5",
+    "@testing-library/jest-dom": "^5.17.0",
+    "@testing-library/react": "^14.0.0",
+    "@testing-library/user-event": "^14.4.3",
+    "@types/jest": "^29.5.3",
+    "jest": "^29.6.2",
+    "jest-environment-jsdom": "^29.6.2",
+    "prettier": "^3.0.1"
+  }
+}

experiments-rtl/postcss.config.js

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+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}

experiments-rtl/public/next.svg

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+import * as React from "react";
+import { render, screen, fireEvent } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+
+test("userEvent.click()", async () => {
+  const handleClick = jest.fn();
+
+  render(
+    <button onClick={handleClick} disabled={false}>
+      Click
+    </button>
+  );
+
+  const button = screen.getByText("Click");
+  await userEvent.click(button);
+  expect(handleClick).toHaveBeenCalledTimes(1);
+});
+
+test("fireEvent.click()", () => {
+  const handleClick = jest.fn();
+
+  render(
+    <button onClick={handleClick} disabled={false}>
+      Click
+    </button>
+  );
+
+  const button = screen.getByText("Click");
+  fireEvent.click(button);
+  expect(handleClick).toHaveBeenCalledTimes(1);
+});

experiments-rtl/public/vercel.svg

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+import * as React from "react";
+import { render, screen, fireEvent } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+
+interface ManagedInputProps {
+  defaultValue?: string;
+  disabled?: boolean;
+}
+
+function ManagedInput({ defaultValue, ...props }: ManagedInputProps) {
+  const [value, setValue] = React.useState(defaultValue ?? "");
+
+  return (
+    <input
+      type="text"
+      value={value}
+      onChange={(e) => setValue(e.currentTarget.value)}
+      {...props}
+    />
+  );
+}
+
+test("userEvent.type()", async () => {
+  render(
+    <ManagedInput data-testid="input" defaultValue="Hello" disabled={false} />
+  );
+
+  const input = screen.getByTestId("input");
+  await userEvent.type(input, " World");
+  expect(input).toHaveValue("Hello World");
+});
+
+test("userEvent.clear()", async () => {
+  render(
+    <ManagedInput data-testid="input" defaultValue="Hello" disabled={false} />
+  );
+
+  const input = screen.getByTestId("input");
+  await userEvent.clear(input);
+  expect(input).toHaveValue("");
+});
+
+test("fireEvent.change()", () => {
+  render(
+    <ManagedInput data-testid="input" defaultValue="Hello" disabled={false} />
+  );
+
+  const input = screen.getByTestId("input");
+  fireEvent.change(input, { target: { value: "World" } });
+  expect(input).toHaveValue("World");
+});

experiments-rtl/src/app/__tests__/click.test.tsx

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+:root {
+  --foreground-rgb: 0, 0, 0;
+  --background-start-rgb: 214, 219, 220;
+  --background-end-rgb: 255, 255, 255;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --foreground-rgb: 255, 255, 255;
+    --background-start-rgb: 0, 0, 0;
+    --background-end-rgb: 0, 0, 0;
+  }
+}
+
+body {
+  color: rgb(var(--foreground-rgb));
+  background: linear-gradient(
+      to bottom,
+      transparent,
+      rgb(var(--background-end-rgb))
+    )
+    rgb(var(--background-start-rgb));
+}

experiments-rtl/src/app/__tests__/managed-text-input.test.tsx

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+import './globals.css'
+import type { Metadata } from 'next'
+import { Inter } from 'next/font/google'
+
+const inter = Inter({ subsets: ['latin'] })
+
+export const metadata: Metadata = {
+  title: 'Create Next App',
+  description: 'Generated by create next app',
+}
+
+export default function RootLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return (
+    <html lang="en">
+      <body className={inter.className}>{children}</body>
+    </html>
+  )
+}