test: add testing

.github/workflows/run-tests.yaml

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+name: Run Tests
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "20"
+      - name: Install dependencies
+        run: npm install
+      - name: Run tests
+        run: npm run test

jest.config.ts

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+/**
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+import type { Config } from "jest";
+import nextJest from "next/jest.js";
+import { pathsToModuleNameMapper } from "ts-jest";
+import { compilerOptions } from "./tsconfig.json";
+
+const createJestConfig = nextJest({
+  // Provide the path to your Next.js app to load next.config.js and .env files in your test environment
+  dir: "./",
+});
+
+const config: Config = {
+  testEnvironment: "jsdom",
+  coverageProvider: "v8",
+  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths, {
+    prefix: "<rootDir>/",
+  }),
+  setupFilesAfterEnv: ["<rootDir>/jest.setup.ts"],
+};
+
+export default createJestConfig(config);

jest.setup.ts

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+import "@testing-library/jest-dom";
+import ResizeObserver from "resize-observer-polyfill";
+global.ResizeObserver = ResizeObserver;