{"id":49926,"date":"2024-01-03T18:41:17","date_gmt":"2024-01-03T09:41:17","guid":{"rendered":"https:\/\/kinsta.com\/jp\/?p=49926&#038;preview=true&#038;preview_id=49926"},"modified":"2024-01-04T22:12:22","modified_gmt":"2024-01-04T13:12:22","slug":"jest","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/jest\/","title":{"rendered":"Jest\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30c6\u30b9\u30c8\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p><a href=\"https:\/\/kinsta.com\/jp\/blog\/performance-testing-tools\/\">\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30c6\u30b9\u30c8<\/a>\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u3067\u907f\u3051\u3066\u901a\u308c\u307e\u305b\u3093\u3002\u958b\u767a\u306e\u521d\u671f\u6bb5\u968e\u3067\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3001\u4fee\u6b63\u3059\u308b\u3053\u3068\u3067\u3001\u5fa9\u5143\u529b\u306e\u3042\u308b\u8cea\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>JavaScript\u306e\u30c6\u30b9\u30c8\u30c4\u30fc\u30eb\u306f\u591a\u6570\u3042\u308a\u307e\u3059\u304c\u3001\u4e2d\u3067\u3082Jest\u306f\u4eba\u6c17\u306e\u9ad8\u3044\u9078\u629e\u80a2\u3067\u3059\u3002Meta\u793e\u306e\u88fd\u54c1\u3067\u3042\u308bJest\u306b\u306f\u3001JavaScript\u30a2\u30d7\u30ea\u3068JavaScript\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u69cb\u7bc9\u3055\u308c\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5411\u3051\u306e\u5e83\u7bc4\u306a\u30c6\u30b9\u30c8\u6a5f\u80fd\u304c\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Jest\u306e\u6982\u8981\u3068\u4e3b\u306a\u6a5f\u80fd\u3001\u305d\u3057\u3066\u958b\u767a\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306bJest\u3092\u7d71\u5408\u3059\u308b\u65b9\u6cd5\u3092\u6398\u308a\u4e0b\u3052\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc>\n<h2>Jest\u3068\u306f<\/h2>\n<p><a href=\"https:\/\/jestjs.io\/\" target=\"_blank\" rel=\"noopener noreferrer\">Jest<\/a>\u306f\u67d4\u8edf\u306a\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3001\u4f7f\u3044\u65b9\u3082\u7c21\u5358\u3067\u3059\u3002JavaScript\u3092\u30c6\u30b9\u30c8\u3059\u308b\u30b3\u30a2\u6a5f\u80fd\u306b\u52a0\u3048\u3066\u3001Babel\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/vite-vs-webpack\/\">webpack\u3001Vite<\/a>\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/rollup-vs-webpack-vs-parcel\/\">Parcel<\/a>\u3001\u307e\u305f\u306f<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-typescript\/\">TypeScript<\/a>\u30d9\u30fc\u30b9\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306e\u8a2d\u5b9a\u3084\u30d7\u30e9\u30b0\u30a4\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u591a\u304f\u306e\u958b\u767a\u8005\u304cJest\u3092\u63a1\u7528\u3057\u3066\u304a\u308a\u3001\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306b\u3088\u3063\u3066\u69cb\u7bc9\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u884c\u308f\u308c\u3066\u3044\u308b\u6570\u3005\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3082\u9b45\u529b\u3067\u3059\u3002\u4f55\u3068\u8a00\u3063\u3066\u3082\u3001Jest\u306e\u4f7f\u3044\u3084\u3059\u3055\u306f\u4ed6\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u4e00\u7dda\u3092\u753b\u3057\u3066\u304a\u308a\u3001JavaScript\u306e\u30c6\u30b9\u30c8\u306b\u8a2d\u5b9a\u3084\u30d7\u30e9\u30b0\u30a4\u30f3\u306f\u3044\u308a\u307e\u305b\u3093\u3002<a href=\"https:\/\/kinsta.com\/jp\/topics\/javascript-frameworks\/\">JavaScript\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af<\/a>\u3092\u30c6\u30b9\u30c8\u3059\u308b\u5834\u5408\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3088\u308a\u9ad8\u5ea6\u306a\u30c6\u30b9\u30c8\u3092\u5b9f\u65bd\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>JavaScript\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067Jest\u3092\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u65e2\u5b58\u306eJavaScript\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067Jest\u3092\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u524d\u63d0\u6761\u4ef6<\/h3>\n<p>\u3053\u308c\u304b\u3089\u3054\u7d39\u4ecb\u3059\u308b\u624b\u9806\u3067\u306f\u3001\u4ee5\u4e0b\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u524d\u63d0\u3068\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><a href=\"https:\/\/nodejs.org\/en\/download\" target=\"_blank\" rel=\"noopener noreferrer\">Node.js<\/a><\/li>\n<li>npm\uff08Node.js\u306e\u4e00\u90e8\uff09\u307e\u305f\u306f<a href=\"https:\/\/classic.yarnpkg.com\/lang\/en\/docs\/install\/#windows-stable\" target=\"_blank\" rel=\"noopener noreferrer\">yarn<\/a><\/li>\n<li>Jest\u306e<a href=\"https:\/\/www.npmjs.com\/package\/jest\" target=\"_blank\" rel=\"noopener noreferrer\">npm\u30d1\u30c3\u30b1\u30fc\u30b8<\/a><\/li>\n<\/ul>\n<h3>Jest\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h3>\n<ol start=\"1\">\n<li>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u307e\u3060\u304a\u6301\u3061\u3067\u306a\u3044\u5834\u5408\u306f\u3001<a href=\"https:\/\/github.com\/VirtuaCreative\/kinsta-jest-javascript\" target=\"_blank\" rel=\"noopener noreferrer\">\u3053\u3061\u3089\u306e\u30ea\u30dd\u30b8\u30c8\u30ea<\/a>\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ol>\n<p><a href=\"https:\/\/github.com\/VirtuaCreative\/kinsta-jest-javascript\/tree\/starter-files\" target=\"_blank\" rel=\"noopener noreferrer\"><code>starter-files<\/code><\/a>\u30d6\u30e9\u30f3\u30c1\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30d3\u30eb\u30c9\u3059\u308b\u305f\u3081\u306e\u57fa\u76e4\u3068\u306a\u308a\u307e\u3059\u3002<a href=\"https:\/\/github.com\/VirtuaCreative\/kinsta-jest-javascript\/tree\/main\"><code>main<\/code><\/a>\u30d6\u30e9\u30f3\u30c1\u3067\u30b3\u30fc\u30c9\u5168\u4f53\u3092\u8868\u793a\u3057\u3001\u30b3\u30fc\u30c9\u3092\u7167\u3089\u3057\u5408\u308f\u305b\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ol start=\"2\">\n<li>\u30bf\u30fc\u30df\u30ca\u30eb\u3067\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u79fb\u52d5\u3057\u3001\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3067Jest\u3092<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-npm\/\">npm<\/a>\u3067\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-bash\">npm install --save-dev jest<\/code><\/pre>\n<p><code>--save-dev<\/code>\u306f\u3001<code>devDependencies<\/code>\u306e\u4e0b\u306b\u958b\u767a\u306b\u5fc5\u8981\u306a\u4f9d\u5b58\u95a2\u4fc2\u3092\u542b\u3080\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3088\u3046npm\u306b\u6307\u793a\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<h3>Jest\u306e\u8a2d\u5b9a<\/h3>\n<p>Jest\u306f\u57fa\u672c\u7684\u306b\u8a2d\u5b9a\u306a\u3057\u3067\u52d5\u4f5c\u3057\u307e\u3059\u304c\u3001<strong>package.json<\/strong>\u30d5\u30a1\u30a4\u30eb\u3068\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\uff08<strong>jest.config.js<\/strong>\uff09\u3092\u4f7f\u3063\u3066\u6a5f\u80fd\u3092\u5f37\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h4>package.json\u30d5\u30a1\u30a4\u30eb\u3067\u306e\u8a2d\u5b9a<\/h4>\n<p><strong>package.json<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6301\u3064<code>jest<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-json\">{\n  \u2026\n  \"jest\": {\n    \"displayName\": \"Ecommerce\",\n    \"globals\": {\n      \"PROJECT_NAME\": \"Ecommerce TD\"\n    },\n    \"bail\": 20,\n    \"verbose\": true\n  },\n}<\/code><\/pre>\n<p>\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u30c6\u30b9\u30c8\u3092\u884c\u3046\u969b\u3001Jest\u304c\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u691c\u7d22\u3057\u3066\u8a2d\u5b9a\u3092\u9069\u7528\u3057\u307e\u3059\u3002<a href=\"https:\/\/jestjs.io\/docs\/configuration\" target=\"_blank\" rel=\"noopener noreferrer\">Jest\u306e\u8a2d\u5b9a\u306b\u95a2\u3059\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a>\u306b\u8a73\u7d30\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ul>\n<li><code>displayName<\/code>\u2500\u30e9\u30d9\u30eb\u3068\u3057\u3066\u30c6\u30b9\u30c8\u7d50\u679c\u306b\u8ffd\u52a0\u3055\u308c\u308b<\/li>\n<li><code>globals<\/code>\u2500\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u3092\u4fdd\u6301\u3057\u3001\u30c6\u30b9\u30c8\u74b0\u5883\u3067\u5229\u7528\u53ef\u80fd\u306a\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3092\u5b9a\u7fa9<\/li>\n<li><code>bail<\/code>\u2500\u8a2d\u5b9a\u3057\u305f\u56de\u6570\u306e\u5931\u6557\u306e\u5f8c\u306b\u5b9f\u884c\u3092\u505c\u6b62\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u3059\u3079\u3066\u306e\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3057\u3066\u7d50\u679c\u306b\u30a8\u30e9\u30fc\u304c\u8868\u793a\u3055\u308c\u308b\uff09<\/li>\n<li><code>verbose<\/code>\u2500<code>true<\/code>\u306b\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u30c6\u30b9\u30c8\u5b9f\u884c\u4e2d\u306b\u500b\u3005\u306e\u30c6\u30b9\u30c8\u30ec\u30dd\u30fc\u30c8\u3092\u8868\u793a<\/li>\n<\/ul>\n<h4>jest.config.js\u30d5\u30a1\u30a4\u30eb\u3067\u306e\u8a2d\u5b9a<\/h4>\n<p><strong>jest.config.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u3067\u8a2d\u5b9a\u3092\u884c\u3046\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002Jest\u3067\u306f\u3001\u62e1\u5f35\u5b50<strong>.ts<\/strong>\u3001<strong>.mjs<\/strong>\u3001<strong>.cjs<\/strong>\u3001<strong>.json<\/strong>\u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u969b\u3001Jest\u304c\u3053\u308c\u3089\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u63a2\u3057\u3001\u898b\u3064\u304b\u3063\u305f\u30d5\u30a1\u30a4\u30eb\u306e\u8a2d\u5b9a\u3092\u9069\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001<strong>jest.config.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u3067\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8a2d\u5b9a\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">const config = {\n  displayName: \"Ecommerce\",\n  globals: {\n    \"PROJECT_NAME\": \"Ecommerce TD\"\n  },\n  bail: 20,\n  verbose: true\n}\n\nmodule.exports = config;<\/code><\/pre>\n<p>\u4e0a\u306e\u30b3\u30fc\u30c9\u306f\u3001\u524d\u306e\u4f8b\u3068\u540c\u3058\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6301\u3064Jest\u8a2d\u5b9a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30a8\u30af\u30b9\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n<p>JSON\u3067\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u53ef\u80fd\u306a\u8a2d\u5b9a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u542b\u3080\u30ab\u30b9\u30bf\u30e0\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u7528\u3057\u3001 \u305d\u306e\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u3092\u30c6\u30b9\u30c8\u5b9f\u884c\u6642\u306b<code>--config<\/code>\u3078\u6e21\u3059\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h3>\u57fa\u672c\u7684\u306a\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306e\u4f5c\u6210<\/h3>\n<p>Jest\u306e\u8a2d\u5b9a\u3092\u7d42\u3048\u305f\u3089\u3001\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002Jest\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u30ec\u30d3\u30e5\u30fc\u304a\u3088\u3073\u5b9f\u884c\u3057\u3001\u7d50\u679c\u3092\u8868\u793a\u3057\u307e\u3059\u3002\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306f\u901a\u5e38\u3001\u8b58\u5225\u3057\u3084\u3059\u3044\u3088\u3046\u3001<strong>[\u540d\u524d].test.js<\/strong>\u3084<strong>[\u540d\u524d]-test.js<\/strong> \u306e\u3088\u3046\u306a\u5f62\u5f0f\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3068\u3057\u3066\u3001\u6b21\u306e\u3088\u3046\u306a<strong>string-format.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">function truncate(\n  str,\n  count,\n  withEllipsis = true\n) {\n  if (str.length &lt; = count)\n    return str\n\n  const substring = str.substr(0, count)\n\n  if (!withEllipsis)\n    return substring\n\n  return substring + '...'\n}\n\nmodule.exports = { truncate }<\/code><\/pre>\n<p><code>truncate()<\/code>\u306f\u3001\u6587\u5b57\u5217\u3092\u7279\u5b9a\u306e\u9577\u3055\u306b\u30ab\u30c3\u30c8\u3057\u3001\u7701\u7565\u8a18\u53f7\u3092\u8ffd\u52a0\u3059\u308b\u95a2\u6570\u3067\u3059\u3002<\/p>\n<h4>\u30c6\u30b9\u30c8\u306e\u8a18\u8ff0<\/h4>\n<ol start=\"1\">\n<li>\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u300c<strong>string-format.test.js<\/strong>\u300d\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<ol start=\"1\">\n<li>\u8b58\u5225\u3057\u3084\u3059\u3044\u3088\u3046\u3001<strong>string-format.test.js<\/strong>\u306f\u3001<strong>string-format.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u3068\u540c\u3058\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3001\u307e\u305f\u306f\u7279\u5b9a\u306e\u30c6\u30b9\u30c8\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u7f6e\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u5185\u306e\u3069\u3053\u306b\u3042\u3063\u3066\u3082\u554f\u984c\u306a\u304f\u3001\u69d8\u3005\u306a\u30b7\u30ca\u30ea\u30aa\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30c6\u30b9\u30c8\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>string-format.test.js<\/strong>\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u57fa\u672c\u7684\u306a\u30c6\u30b9\u30c8\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">const { truncate } = require('.\/string-format')\n\ntest('truncates a string correctly', () = &gt; {\n  expect(truncate(\"I am going home\", 6)).toBe('I am g...')\n})<\/code><\/pre>\n<p>\u4e0a\u306e\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306b\u306f\u3001<code>truncates a string correctly<\/code>\uff08\u6587\u5b57\u5217\u3092\u9069\u5207\u306b\u77ed\u304f\u3059\u308b\uff09\u3092\u542b\u307e\u308c\u3066\u304a\u308a\u3001<code>expect<\/code>\u95a2\u6570\u3067\u5024\u304c\u671f\u5f85\u3055\u308c\u308b\u7d50\u679c\u3068\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<p><code>expect<\/code>\u3078\u306e\u5f15\u6570\u3068\u3057\u3066\u3001<code>truncate(\"I am going home\", 6)<\/code>\u3092\u6e21\u3057\u307e\u3059\u3002 \u307e\u305f\u3001<code>truncate<\/code>\u3092\u5f15\u6570<code>\"I am going home\"<\/code>\u304a\u3088\u3073<code>6<\/code>\u3067\u547c\u3073\u51fa\u3057\u3001\u8fd4\u3055\u308c\u305f\u5024\u3092\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002<code>expect<\/code>\u306e\u547c\u3073\u51fa\u3057\u306b\u3088\u3063\u3066\u3001\u671f\u5f85\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u8fd4\u3055\u308c\u3001Matcher\uff08\u30de\u30c3\u30c1\u30e3\u30fc\uff09\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u63d0\u4f9b\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001<code>\"I am g\u2026\"<\/code>\u3092\u5f15\u6570\u3068\u3057\u3066\u6301\u3064<code>toBe<\/code>\u30de\u30c3\u30c1\u30e3\u30fc\u306f\u3001\u671f\u5f85\u3059\u308b\u5024\u3068\u5b9f\u969b\u306e\u5024\u304c\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<h4>\u30c6\u30b9\u30c8\u306e\u5b9f\u884c<\/h4>\n<p>\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u306b\u306f\u3001<code>jest<\/code>\u30b3\u30de\u30f3\u30c9\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<ol start=\"1\">\n<li><strong>package.json<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u306e<code>test<\/code>\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-json\">\"scripts\": {\n  \"test\": \"jest\"\n}<\/code><\/pre>\n<ol start=\"2\">\n<li><code>npm run test<\/code>\u3001<code>npm test<\/code>\u3001<code>npm t<\/code>\u3092\u30bf\u30fc\u30df\u30ca\u30eb\u3067\u5b9f\u884c\u3059\u308b\u3068\u3001Jest\u304c\u8d77\u52d5\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure style=\"width: 927px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-string-format-test.png\" alt=\"string-format.test.js\u306e\u30c6\u30b9\u30c8\u7d50\u679c\u4f8b\" width=\"927\" height=\"275\"><figcaption class=\"wp-caption-text\">string-format.test.js\u306e\u30c6\u30b9\u30c8\u7d50\u679c\u4f8b<\/figcaption><\/figure>\n<p>1\u3064\u306e\u30c6\u30b9\u30c8\u30b9\u30a4\u30fc\u30c8\uff08<strong>string-format.test.js<\/strong>\u30d5\u30a1\u30a4\u30eb\uff09\u3001\u6b63\u5e38\u306b\u5b9f\u884c\u3055\u308c\u305f1\u3064\u306e\u30c6\u30b9\u30c8\uff08<code>\"truncates a string correctly\"<\/code>\uff09\u3001\u304a\u3088\u3073\u8a2d\u5b9a\u3067\u5b9a\u7fa9\u3057\u305f<code>displayName<\/code>\uff08<code>Ecommerce<\/code>\uff09\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<ol start=\"3\">\n<li><strong>string-format.js<\/strong>\u3067\u4f59\u5206\u306a\u30d4\u30ea\u30aa\u30c9\u3092\u8ffd\u52a0\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u30c6\u30b9\u30c8\u306b\u5931\u6557\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<figure style=\"width: 1100px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-test-truncate-failed.png\" alt=\"TRUNCATE\u306e\u5165\u529b\u30df\u30b9\u306b\u3088\u308b\u30c6\u30b9\u30c8\u7d50\u679c\u306e\u5931\u6557\u4f8b\" width=\"1100\" height=\"612\"><figcaption class=\"wp-caption-text\">TRUNCATE\u306e\u5165\u529b\u30df\u30b9\u306b\u3088\u308b\u30c6\u30b9\u30c8\u7d50\u679c\u306e\u5931\u6557\u4f8b<\/figcaption><\/figure>\n<p>\u3053\u308c\u306f\u3001<code>truncate<\/code>\u95a2\u6570\u306b\u8aa4\u308a\u304c\u3042\u308b\u304b\u3001\u30c6\u30b9\u30c8\u306e\u66f4\u65b0\u304c\u5fc5\u8981\u306a\u5909\u66f4\u304c\u884c\u308f\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u5506\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>Jest\u3067\u30c6\u30b9\u30c8\u3092\u8a18\u8ff0\u3059\u308b\u65b9\u6cd5<\/h2>\n<h3>Jest\u306e\u30c6\u30b9\u30c8\u69cb\u6587<\/h3>\n<p>Jest\u306e\u69cb\u6587\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30e1\u30bd\u30c3\u30c9\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3042\u308a\u307e\u3059\u3002\u4e3b\u306a\u95a2\u6570\u306b\u306f\u3001<code>describe<\/code>\u3001<code>test<\/code>\u3001<code>expect<\/code>\u3001\u305d\u3057\u3066\u30de\u30c3\u30c1\u30e3\u30fc\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><code>describe<\/code>\u2500\u95a2\u9023\u3059\u308b\u30c6\u30b9\u30c8\u3092\u30d5\u30a1\u30a4\u30eb\u306b\u30b0\u30eb\u30fc\u30d7\u5316<\/li>\n<li><code>test<\/code>\u2500\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\uff08<code>it<\/code>\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\u3067\u3001\u30c6\u30b9\u30c8\u3057\u305f\u3044\u5024\u306e\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u304c\u542b\u307e\u308c\u308b\uff09<\/li>\n<li><code>expect<\/code>\u2500\u3055\u307e\u3056\u307e\u306a\u5024\u306b\u5bfe\u3059\u308b\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u5ba3\u8a00\uff08\u3055\u307e\u3056\u307e\u306a\u5f62\u5f0f\u306e\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u306b\u5bfe\u5fdc\u3059\u308b\u30de\u30c3\u30c1\u30e3\u30fc\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u63d0\u4f9b\uff09<\/li>\n<li>\u30de\u30c3\u30c1\u30e3\u30fc\u2500\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3067\u5024\u3092\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3002\u5024\u3084\u771f\u507d\u5024\u306e\u7b49\u4fa1\u6027\u3001\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u7b49\u4fa1\u6027\uff08\u914d\u5217\u306b\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306a\u3069\uff09\u3092\u78ba\u8a8d\u3067\u304d\u308b\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u95a2\u6570\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u5177\u4f53\u7684\u306b\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n<ol start=\"1\">\n<li><strong>string-format.test.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u306e\u30c6\u30b9\u30c8\u3092\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">describe(\"all string formats work as expected\", () = &gt; {\n  test(\"truncates a string correctly\", () = &gt; {\n    expect(\n      truncate(\"I am going home\", 6)\n    ).toBe(\"I am g...\")\n  })\n})<\/code><\/pre>\n<ol start=\"2\">\n<li>\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<figure style=\"width: 993px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-test-truncate-string.png\" alt=\"describe\u30e9\u30d9\u30eb\u304c\u8868\u793a\u3055\u308c\u305f\u30c6\u30b9\u30c8\u306e\u6210\u529f\u4f8b\" width=\"993\" height=\"292\"><figcaption class=\"wp-caption-text\">describe\u30e9\u30d9\u30eb\u304c\u8868\u793a\u3055\u308c\u305f\u30c6\u30b9\u30c8\u306e\u6210\u529f\u4f8b<\/figcaption><\/figure>\n<p>\u4e0a\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u3067\u306f\u3001<code>describe<\/code>\u306e\u30e9\u30d9\u30eb\u304c\u30d6\u30ed\u30c3\u30af\u3092\u4f5c\u6210\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<code>describe<\/code>\u306f\u5fc5\u9808\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u3088\u308a\u591a\u304f\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u6301\u3064\u30d5\u30a1\u30a4\u30eb\u306b\u30c6\u30b9\u30c8\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u3068\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<h3>\u30c6\u30b9\u30c8\u3092Test Suite\u3067\u307e\u3068\u3081\u308b<\/h3>\n<p>Jest\u306e\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306b\u306f\u3001<code>test<\/code>\u95a2\u6570\u3001<code>expect<\/code>\u95a2\u6570\u3001\u30de\u30c3\u30c1\u30e3\u30fc\u3067\u69cb\u6210\u3055\u308c\u3001\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306e\u96c6\u307e\u308a\u306fTest Suite\uff08\u30c6\u30b9\u30c8\u30b9\u30a4\u30fc\u30c8\uff09\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u5148\u307b\u3069\u306e\u4f8b\u3067\u306f\u3001<strong>string-format.test.js<\/strong>\u306f<strong>string-format.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u3092\u30c6\u30b9\u30c8\u3059\u308b1\u3064\u306e\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u304b\u3089\u69cb\u6210\u3055\u308c\u308b\u30c6\u30b9\u30c8\u30b9\u30a4\u30fc\u30c8\u3067\u3059\u3002<\/p>\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u3001<strong>file-operations.js<\/strong>\u3001<strong>api-logger.js<\/strong>\u3001<strong>number-format.js<\/strong>\u306a\u3069\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308b\u3068\u3057\u305f\u3089\u3001\u305d\u308c\u305e\u308c<strong>file-operations.test.js<\/strong>\u3001<strong>api-logger.test.js<\/strong>\u3001<strong>number-format.test.js<\/strong>\u306e\u3088\u3046\u306a\u30c6\u30b9\u30c8\u30b9\u30a4\u30fc\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30de\u30c3\u30c1\u30e3\u30fc\u3092\u4f7f\u3063\u3066\u30b7\u30f3\u30d7\u30eb\u306a\u30b7\u30f3\u30d7\u30eb\u306a\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u66f8\u304f<\/h3>\n<p>\u5148\u306b<code>toBe<\/code>\u30de\u30c3\u30c1\u30e3\u30fc\u306b\u3064\u3044\u3066\u89e6\u308c\u307e\u3057\u305f\u304c\u3001<a href=\"https:\/\/jestjs.io\/docs\/expect#matchers\" target=\"_blank\" rel=\"noopener noreferrer\">Jest\u306e\u30de\u30c3\u30c1\u30e3\u30fc<\/a>\u3092\u4f7f\u7528\u3057\u305f\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><code>toEqual<\/code>\u2500\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u518d\u5e30\u7684\u306b\u7b49\u3057\u3044\u304b\uff08\u300c\u6df1\u3044\u300d\u7b49\u4fa1\u6027\u3068\u3082\uff09\u3092\u691c\u8a3c<\/li>\n<li><code>toBeTruthy<\/code>\u2500\u771f\u507d\u5024\u306e\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u3067\u5024\u304c\u771f\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c<\/li>\n<li><code>toBeFalsy<\/code>\u2500\u771f\u507d\u5024\u306e\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u5024\u304c\u507d\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c<\/li>\n<li><code>toContain<\/code>\u2500\u914d\u5217\u304c\u5024\u3092\u542b\u3080\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c<\/li>\n<li><code>toThrow<\/code>\u2500\u547c\u3073\u51fa\u3055\u308c\u305f\u95a2\u6570\u304c\u30a8\u30e9\u30fc\u3092\u6295\u3052\u308b\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c<\/li>\n<li><code>stringContaining<\/code>\u2500\u6587\u5b57\u5217\u304c\u90e8\u5206\u6587\u5b57\u5217\u3092\u542b\u3080\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c<\/li>\n<\/ul>\n<p>\u3044\u304f\u3064\u304b\u5177\u4f53\u4f8b\u3092\u6319\u3052\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u95a2\u6570\u3084\u30b3\u30fc\u30c9\u304c\u7279\u5b9a\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u5024\u3092\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059\u3053\u3068\u3092\u30c6\u30b9\u30c8\u3057\u305f\u3044\u3068\u3057\u307e\u3059\u3002<\/p>\n<ol start=\"1\">\n<li>\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u8fd4\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u671f\u5f85\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u7b49\u3057\u3044\u3053\u3068\u3092\u691c\u8a3c\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">expect({\n  name: \"Joe\",\n  age: 40\n}).toBe({\n  name: \"Joe\",\n  age: 40\n})<\/code><\/pre>\n<p>\u4e0a\u3067\u306f<code>toBe<\/code>\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u3053\u306e\u30de\u30c3\u30c1\u30e3\u30fc\u306f\u6df1\u3044\u7b49\u4fa1\u6027\u3092\u691c\u8a3c\u3057\u306a\u3044\u305f\u3081\u3001\u30c6\u30b9\u30c8\u306b\u5931\u6557\u3057\u307e\u3059\u3002<\/p>\n<ol start=\"2\">\n<li>\u6df1\u3044\u7b49\u4fa1\u6027\u306e\u78ba\u8a8d\u306b\u306f\u3001<code>toEqual<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">expect({\n  name: \"Joe\",\n  age: 40\n}).toEqual({\n  name: \"Joe\",\n  age: 40\n})<\/code><\/pre>\n<p>\u3053\u306e\u5834\u5408\u306f\u3001\u4e21\u65b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6df1\u304f\u7b49\u3057\u3044\u3001\u3064\u307e\u308a\u4e00\u81f4\u3059\u308b\u305f\u3081\u30d1\u30b9\u3057\u307e\u3059\u3002<\/p>\n<ol start=\"3\">\n<li>\u5b9a\u7fa9\u3055\u308c\u305f\u914d\u5217\u306b\u7279\u5b9a\u306e\u8981\u7d20\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c6\u30b9\u30c8\u3059\u308b\u306b\u306f\u3001\u5225\u306e\u30de\u30c3\u30c1\u30e3\u30fc\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">expect([\"orange\", \"pear\", \"apple\"]).toContain(\"mango\")<\/code><\/pre>\n<p><code>toContain<\/code>\u306f\u3001<code>[\"orange\", \"pear\", \"apple\"]<\/code>\u914d\u5217\u306b\u671f\u5f85\u5024\u3067\u3042\u308b<code>\"mango\"<\/code>\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u914d\u5217\u306b\u306f\u542b\u307e\u308c\u306a\u3044\u305f\u3081\u3001\u30c6\u30b9\u30c8\u306b\u5931\u6557\u3057\u307e\u3059\u3002<\/p>\n<ol start=\"4\">\n<li>\u540c\u69d8\u306e\u30c6\u30b9\u30c8\u306b\u5909\u6570\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">const fruits = [\"orange\", \"pear\", \"apple\"];\nconst expectedFruit = \"mango\";\n\nexpect(fruits).toContain(expectedFruit)<\/code><\/pre>\n<h3>\u975e\u540c\u671f\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8<\/h3>\n<p>\u3053\u3053\u307e\u3067\u306f\u540c\u671f\u30b3\u30fc\u30c9\u3001\u3064\u307e\u308a\u30b3\u30fc\u30c9\u304c\u6b21\u306e\u884c\u3092\u5b9f\u884c\u3059\u308b\u524d\u306b\u5024\u3092\u8fd4\u3059\u30b3\u30fc\u30c9\u3092\u30c6\u30b9\u30c8\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u304d\u307e\u3057\u305f\u3002Jest\u3067\u306f\u3001<code>async<\/code>\u3001<code>await<\/code>\u3001Promises \u3092\u4f7f\u7528\u3057\u3066\u975e\u540c\u671f\u30b3\u30fc\u30c9\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001<strong> apis.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u306f<a href=\"https:\/\/kinsta.com\/jp\/blog\/javascript-http-request\/\" target=\"_blank\" rel=\"noopener noreferrer\">API\u30ea\u30af\u30a8\u30b9\u30c8<\/a>\u3092\u884c\u3046\u95a2\u6570\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">function getTodos() {\n  return fetch('https:\/\/jsonplaceholder.typicode.com\/todos\/1')\n}\n<\/code><\/pre>\n<p><code>getTodos<\/code>\u306f\u3001<code>GET<\/code>\u30ea\u30af\u30a8\u30b9\u30c8\u3092<code>https:\/\/jsonplaceholder.typicode.com\/todos\/1<\/code>\u306b\u9001\u308a\u307e\u3059\u3002<\/p>\n<ol start=\"1\">\n<li><a href=\"https:\/\/jsonplaceholder.typicode.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u507d\u306eAPI<\/a>\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067<strong>apis.test.js<\/strong>\u3068\u3044\u3046\u540d\u524d\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u3066\u307f\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">const { getTodos } = require('.\/apis')\n\ntest(\"gets a todo object with the right properties\", () = &gt; {\n  return getTodos()\n    .then((response) = &gt; {\n      return response.json()\n    })\n    .then((data) = &gt; {\n      expect(data).toHaveProperty('userId')\n      expect(data).toHaveProperty('id')\n      expect(data).toHaveProperty('title')\n      expect(data).toHaveProperty('completed')\n      expect(data).toHaveProperty('description')\n    })\n})<\/code><\/pre>\n<p>\u3053\u306e\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306f\u3001<code>todo<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3059\u308b<code>getTodos<\/code>\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002Promise\u3092\u89e3\u6c7a\u3059\u308b\u3068\u3001<code>.then<\/code>\u95a2\u6570\u3092\u4f7f\u3063\u3066\u89e3\u6c7a\u3055\u308c\u305f\u5024\u304c\u53d6\u5f97\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5024\u3067\u3001\u30ec\u30b9\u30dd\u30f3\u30b9\u3092JSON\u5f62\u5f0f\u306b\u5909\u63db\u3059\u308b\u5225\u306ePromise\u3001<code>response.json()<\/code>\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u5225\u306e<code>.then<\/code>\u95a2\u6570\u304c\u3001<code>expect<\/code>\u3068\u30de\u30c3\u30c1\u30e3\u30fc\u3092\u542b\u3080JSON\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3002\u3053\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u306f\u3001JSON\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b<code>userId<\/code>\u3001<code>id<\/code>\u3001<code>title<\/code>\u3001<code>completed<\/code>\u3001<code>description<\/code>\u306e5\u3064\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<ol start=\"2\">\n<li>\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<figure style=\"width: 1197px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-test-apis-failed.png\" alt=\"\u975e\u540c\u671f\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8\u7d50\u679c\u306e\u5931\u6557\u4f8b\" width=\"1197\" height=\"794\"><figcaption class=\"wp-caption-text\">\u975e\u540c\u671f\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8\u7d50\u679c\u306e\u5931\u6557\u4f8b<\/figcaption><\/figure>\n<p>\u4e0a\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u304b\u3089\u5206\u304b\u308b\u901a\u308a\u3001<code>getTodos()<\/code>\u306e\u30c6\u30b9\u30c8\u306f\u5931\u6557\u3057\u307e\u3059\u3002<code>description<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u671f\u5f85\u3057\u3066\u3044\u305f\u3082\u306e\u306e\u3001API\u304c\u305d\u308c\u3092\u8fd4\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u3053\u306e\u5834\u5408\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u305d\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u305d\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u542b\u3081\u308b\u3088\u3046\u306bAPI\u7ba1\u7406\u306e\u62c5\u5f53\u8005\u306b\u4f9d\u983c\u3059\u308b\u304b\u3001API\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u6e80\u305f\u3059\u3088\u3046\u306b\u30c6\u30b9\u30c8\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002<\/p>\n<ol start=\"3\">\n<li><code>description<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u524a\u9664\u3057\u3001\u30c6\u30b9\u30c8\u3092\u518d\u5b9f\u884c\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<figure style=\"width: 1198px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-test-async.png\" alt=\"\u975e\u540c\u671f\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8\u304c\u30d1\u30b9\u3057\u305f\u3053\u3068\u3092\u793a\u3059\u30c6\u30b9\u30c8\u7d50\u679c\" width=\"1198\" height=\"397\"><figcaption class=\"wp-caption-text\">\u975e\u540c\u671f\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8\u304c\u30d1\u30b9\u3057\u305f\u3053\u3068\u3092\u793a\u3059\u30c6\u30b9\u30c8\u7d50\u679c<\/figcaption><\/figure>\n<p>\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u306f\u3001\u3059\u3079\u3066\u304c\u30c6\u30b9\u30c8\u306b\u5408\u683c\u3057\u305f\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<ol start=\"4\">\n<li>\u5f93\u6765\u306ePromise\u51e6\u7406\u3067\u306f\u306a\u304f\u3001<code>async\/await<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">test(\"gets a todo object with the right properties\", async () = &gt; {\n  const response = await getTodos()\n  const data = await response.json()\n\n  expect(data).toHaveProperty(\"userId\")\n  expect(data).toHaveProperty(\"id\")\n  expect(data).toHaveProperty(\"title\")\n  expect(data).toHaveProperty(\"completed\")\n})<\/code><\/pre>\n<p>\u4e0a\u306e\u4f8b\u3067\u306f\u3001<code>asyncg<\/code>\u304c\u95a2\u6570\u306e\u524d\u306b\u304d\u3066\u3044\u307e\u3059\u3002<code>getTodos()<\/code>\u306e\u524d\u306b<code>await<\/code>\u3092\u4f7f\u3044\u3001<code>response.json()<\/code>\u306e\u524d\u306b<code>await<\/code>\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>Jest\u306e\u9ad8\u5ea6\u306a\u6a5f\u80fd<\/h2>\n<h3>\u30e2\u30c3\u30af\u95a2\u6570\u3068\u30e2\u30b8\u30e5\u30fc\u30eb<\/h3>\n<p>\u30c6\u30b9\u30c8\u3092\u66f8\u304f\u969b\u3001\u5916\u90e8\u4f9d\u5b58\u95a2\u4fc2\u3092\u30c6\u30b9\u30c8\u3057\u305f\u3044\u5834\u5408\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u307e\u305f\u5834\u5408\u306b\u3088\u3063\u3066\u306f\uff08\u7279\u306b\u5358\u4f53\u30c6\u30b9\u30c8\u3067\u306f\uff09\u3001\u5916\u90e8\u304b\u3089\u306e\u5f71\u97ff\u3092\u6392\u9664\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3053\u3068\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u306f\u3001Jest\u3067\u95a2\u6570\u3084\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30e2\u30c3\u30af\u3059\u308b\u3053\u3068\u3067\u3001 \u30c6\u30b9\u30c8\u3092\u3088\u308a\u3046\u307e\u304f\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol start=\"1\">\n<li>\u4f8b\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u542b\u3080<strong>functions.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">function multipleCalls(count, callback) {\n  if (count &lt; 0) return;\n\n  for (let counter = 1; counter &lt;= count; counter++) {\n    callback()\n  }\n}<\/code><\/pre>\n<p><code>multipleCalls<\/code>\u95a2\u6570\u306f\u3001<code>count<\/code>\u306e\u5024\u306b\u57fa\u3065\u3044\u3066\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u95a2\u6570\u306f\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\uff08\u5916\u90e8\u4f9d\u5b58\u95a2\u4fc2\uff09\u306b\u4f9d\u5b58\u3057\u3001<code>multipleCalls<\/code>\u304c\u5916\u90e8\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u6b63\u3057\u304f\u5b9f\u884c\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u76ee\u7684\u3067\u3059\u3002<\/p>\n<ol start=\"2\">\n<li>\u6b21\u306e\u30b3\u30fc\u30c9\u3067\u5916\u90e8\u4f9d\u5b58\u95a2\u4fc2\u3092\u30e2\u30c3\u30af\u3057\u3001<strong>functions.test.js<\/strong>\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3067\u4f9d\u5b58\u95a2\u4fc2\u306e\u72b6\u614b\u3092\u8ffd\u8de1\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">const { multipleCalls } = require('.\/functions')\n\ntest(\"functions are called multiple times correctly\", () =&gt; {\n  const mockFunction = jest.fn()\n\n  multipleCalls(5, mockFunction)\n\n  expect(\n    mockFunction.mock.calls.length\n  ).toBe(5)\n})<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001<code>jest<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e<code>fn<\/code>\u30e1\u30bd\u30c3\u30c9\u304c\u30e2\u30c3\u30af\u95a2\u6570\u3092\u4f5c\u6210\u3057\u3001<code>5<\/code>\u3068\u30e2\u30c3\u30af\u95a2\u6570\u3092\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u305f\u5f8c\u3001<code>multipleCalls<\/code>\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001<code>mockFunction<\/code>\u304c5\u56de\u547c\u3073\u51fa\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3082\u306e\u3067\u3001<code>mock<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306f\u3001\u30b3\u30fc\u30c9\u304c\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u65b9\u6cd5\u3068\u8fd4\u3055\u308c\u308b\u5024\u306b\u95a2\u3059\u308b\u60c5\u5831\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n<ol start=\"3\">\n<li>\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ol>\n<figure style=\"width: 1191px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-test-multiplecalls.png\" alt=\"\u30e2\u30c3\u30af\u95a2\u6570\u3092\u4f7f\u3063\u305f\u30c6\u30b9\u30c8\u7d50\u679c\u306e\u6210\u529f\u4f8b\" width=\"1191\" height=\"465\"><figcaption class=\"wp-caption-text\">\u30e2\u30c3\u30af\u95a2\u6570\u3092\u4f7f\u3063\u305f\u30c6\u30b9\u30c8\u7d50\u679c\u306e\u6210\u529f\u4f8b<\/figcaption><\/figure>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001<code>mockFunction<\/code>\u30925\u56de\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30e2\u30c3\u30af\u95a2\u6570\u306f\u5916\u90e8\u4f9d\u5b58\u95a2\u4fc2\u3092\u6a21\u5023\u3057\u3066\u304a\u308a\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u672c\u756a\u74b0\u5883\u3067<code>multipleCalls<\/code>\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u5916\u90e8\u4f9d\u5b58\u95a2\u4fc2\u304c\u4f55\u3067\u3042\u308b\u304b\u306f\u91cd\u8981\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306f\u3001\u3042\u304f\u307e\u3067<code>multipleCalls<\/code>\u304c\u671f\u5f85\u901a\u308a\u306b\u52d5\u4f5c\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002<\/p>\n<ol start=\"4\">\n<li>\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30e2\u30c3\u30af\u3059\u308b\u306b\u306f\u3001<code>mock<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u3092\u6e21\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">const {\n  truncate,\n} = require(\".\/string-format\")\n\njest.mock(\".\/string-format.js\")<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001<strong>string-format.js<\/strong>\u304c\u30a8\u30af\u30b9\u30dd\u30fc\u30c8\u3059\u308b\u3059\u3079\u3066\u306e\u95a2\u6570\u3092\u6a21\u5023\u3057\u3001\u305d\u308c\u3089\u3092\u547c\u3073\u51fa\u3059\u983b\u5ea6\u3092\u8ffd\u8de1\u3057\u307e\u3059\u3002\u30e2\u30b8\u30e5\u30fc\u30eb\u306e<code>truncate<\/code>\u304c\u30e2\u30c3\u30af\u95a2\u6570\u306b\u306a\u308a\u3001\u305d\u306e\u95a2\u6570\u306f\u5143\u306e\u30ed\u30b8\u30c3\u30af\u3092\u5931\u3044\u307e\u3059\u3002<code>truncate.mock.calls.length<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3001\u30c6\u30b9\u30c8\u3067<code>truncate<\/code>\u304c\u4f55\u56de\u5b9f\u884c\u3055\u308c\u305f\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u3001\u307e\u305f\u306f\u30b3\u30fc\u30c9\u304c\u52d5\u4f5c\u3057\u306a\u3044\u5834\u5408\u306f\u3001<a href=\"https:\/\/github.com\/VirtuaCreative\/kinsta-jest-javascript\/tree\/main\" target=\"_blank\" rel=\"noopener noreferrer\">\u5b9f\u88c5\u306e\u5b8c\u5168\u7248<\/a>\u3092\u53c2\u7167\u3057\u6bd4\u8f03\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>Jest\u3068React Testing Library\u3092\u4f7f\u3063\u3066React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30c6\u30b9\u30c8\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u307e\u3060\u304a\u6301\u3061\u3067\u306a\u3044\u5834\u5408\u306b\u306f\u3001<a href=\"https:\/\/github.com\/VirtuaCreative\/kinsta-jest-react\" target=\"_blank\" rel=\"noopener noreferrer\">React\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b8\u30a7\u30af\u30c8<\/a>\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<a href=\"https:\/\/github.com\/VirtuaCreative\/kinsta-jest-react\/tree\/starter-files\" target=\"_blank\" rel=\"noopener noreferrer\"><code>starter-files<\/code><\/a>\u30d6\u30e9\u30f3\u30c1\u306f\u3001\u624b\u9806\u306b\u5f93\u3044\u306a\u304c\u3089\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u306e\u306b\u4fbf\u5229\u3067\u3059\u3002\u307e\u305f\u3001<a href=\"https:\/\/github.com\/VirtuaCreative\/kinsta-jest-react\/tree\/main\/\" target=\"_blank\" rel=\"noopener noreferrer\"><code>main<\/code><\/a>\u30d6\u30e9\u30f3\u30c1\u3067\u30b3\u30fc\u30c9\u5168\u4f53\u3092\u8868\u793a\u3057\u3001\u30b3\u30fc\u30c9\u3092\u7167\u3089\u3057\u5408\u308f\u305b\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>Jest\u3092\u4f7f\u3063\u3066\u3001<a href=\"https:\/\/kinsta.com\/jp\/topics\/react\/\">React<\/a>\u306a\u3069\u306eJavaScript\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<a href=\"https:\/\/create-react-app.dev\/\" target=\"_blank\" rel=\"noopener noreferrer\">Create React App<\/a>\u3067React\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3068\u3001React Testing Library\u3068Jest\u304c\u81ea\u52d5\u7684\u306b\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u307e\u3059\u3002Create React App\u3092\u4f7f\u308f\u305a\u306bReact\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u306f\u3001Babel\u3068<a href=\"https:\/\/github.com\/kentcdodds\/react-testing-library\" target=\"_blank\" rel=\"noopener noreferrer\">React\u30c6\u30b9\u30c8\u30e9\u30a4\u30d6\u30e9\u30ea<\/a>\u3092\u4f7f\u3063\u3066\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u3001Jest\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u304f\u3060\u3055\u3044\u3002<code>starter-app<\/code>\u30d6\u30e9\u30f3\u30c1\u3092\u8907\u88fd\u3059\u308c\u3070\u3001\u4f9d\u5b58\u95a2\u4fc2\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u308a\u3001\u8a2d\u5b9a\u3092\u884c\u3063\u305f\u308a\u3059\u308b\u624b\u9593\u3092\u7701\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol start=\"1\">\n<li>\u4e0a\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3067\u5fc5\u8981\u306a\u4f9d\u5b58\u95a2\u4fc2\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-bash\">npm install --save-dev babel-jest @babel\/preset-env @babel\/preset-react react-testing-library<\/code><\/pre>\n<p>React Testing Library\u306e\u4ee3\u308f\u308a\u306b<a href=\"https:\/\/www.npmjs.com\/package\/enzyme\" target=\"_blank\" rel=\"noopener noreferrer\">Enzyme<\/a>\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<ol start=\"2\">\n<li><strong>babel.config.js<\/strong>\u3067Babel\u306e\u8a2d\u5b9a\u3092\u66f4\u65b0\u3059\u308b\u304b\u3001\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">module.exports = {\n  presets: [\n    '@babel\/preset-env',\n      ['@babel\/preset-react', {runtime: 'automatic'}],\n  ],\n};<\/code><\/pre>\n<ol start=\"3\">\n<li>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u6301\u3064<strong>src\/SubmitButton.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">import React, { useState } from 'react'\n\nexport default function SubmitButton(props) {\n  const {id, label, onSubmit} = props\n  const [isLoading, setisLoading] = useState(false)\n\n  const submit = () =&gt; {\n    setisLoading(true)\n    onSubmit()\n  }\n\n  return <button disabled=\"disabled\" data-testid=\"{id}\"><\/button><\/code><\/pre>\n<p><code>SubmitButton<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u3001\u4ee5\u4e0b3\u3064\u306eprops\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><code>id<\/code>\u2500\u30dc\u30bf\u30f3\u306e\u8b58\u5225\u5b50<\/li>\n<li><code>label<\/code>\u2500 \u30dc\u30bf\u30f3\u306b\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u30c6\u30ad\u30b9\u30c8<\/li>\n<li><code>onSubmit<\/code>\u2500\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u3068\u304d\u306b\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u95a2\u6570<\/li>\n<\/ul>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001<code>data-testid<\/code>\u5c5e\u6027\u306b<code>id<\/code>\u3092\u5272\u308a\u5f53\u3066\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u3053\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f<code>isLoading<\/code>\u306e\u72b6\u614b\u3092\u8ffd\u8de1\u3057\u3001\u8ab0\u304b\u304c\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u305f\u969b\u306b<code>true<\/code>\u306b\u66f4\u65b0\u3057\u307e\u3059\u3002<\/p>\n<ol start=\"4\">\n<li>\u3053\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30c6\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<strong>SubmitButton.test.js<\/strong>\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u8cbc\u308a\u4ed8\u3051\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-js\">import {fireEvent, render, screen} from \"@testing-library\/react\"\nimport \"@testing-library\/jest-dom\"\nimport SubmitButton from \".\/SubmitButton\"\n\ntest(\"SubmitButton becomes disabled after click\", () =&gt; {\n  const submitMock = jest.fn()\n\n  render(\n    &lt;SubmitButton\n      id=\"submit-details\"\n      label=\"Submit\"\n      onSubmit={submitMock}\n    \/ &gt;\n  )\n\n  expect(screen.getByTestId(\"submit-details\")).not.toBeDisabled()\n\n  fireEvent.submit(screen.getByTestId(\"submit-details\"))\n\n  expect(screen.getByTestId(\"submit-details\")).toBeDisabled()\n})<\/code><\/pre>\n<p>\u4e0a\u306e\u30b3\u30fc\u30c9\u306f\u3001<code>SubmitButton<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3001<code>screen.getByTestId<\/code>\u30af\u30a8\u30ea\u3092\u4f7f\u3063\u3066<code>data-testid<\/code>\u5c5e\u6027\u306b\u3088\u308aDOM\u30ce\u30fc\u30c9\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n<p>\u6700\u521d\u306e<code>expect<\/code>\u306f<code>getByTestId(\"submit-details\")<\/code>\u3067\u3001<code>not<\/code>\u4fee\u98fe\u5b50\u3068<code>toBeDisabled<\/code>\u30de\u30c3\u30c1\u30e3\u30fc\uff08<code>react-testing-library<\/code>\u63d0\u4f9b\uff09\u3092\u4f7f\u3063\u3066\u3001\u30dc\u30bf\u30f3\u304c\u7121\u52b9\u3067\u306a\u3044\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u30de\u30c3\u30c1\u30e3\u30fc\u3067<code>not<\/code>\u4fee\u98fe\u5b50\u3092\u4f7f\u7528\u3057\u3001\u30de\u30c3\u30c1\u30e3\u30fc\u306e\u53cd\u5bfe\u3092\u30a2\u30b5\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u4e0a\u3067<code>submit<\/code>\u30a4\u30d9\u30f3\u30c8\u3092\u767a\u751f\u3055\u305b\u3001\u30dc\u30bf\u30f3\u304c\u7121\u52b9\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<a href=\"https:\/\/github.com\/testing-library\/jest-dom#custom-matchers\" target=\"_blank\" rel=\"noopener noreferrer\">\u305d\u306e\u4ed6\u306e\u30ab\u30b9\u30bf\u30e0\u30de\u30c3\u30c1\u30e3\u30fc\u306f\u3053\u3061\u3089<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<ol start=\"5\">\n<li>\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<code>starter-files<\/code>\u30d6\u30e9\u30f3\u30c1\u3092\u8907\u88fd\u3059\u308b\u5834\u5408\u306f\u3001\u30c6\u30b9\u30c8\u306e\u524d\u306b<code>npm install<\/code>\u3092\u5b9f\u884c\u3057\u3001 \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u3059\u3079\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<figure style=\"width: 941px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-test-truncate-react.png\" alt=\"React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30c6\u30b9\u30c8\u304c\u30d1\u30b9\u3057\u305f\u3053\u3068\u3092\u793a\u3059\u30c6\u30b9\u30c8\u7d50\u679c\" width=\"941\" height=\"353\"><figcaption class=\"wp-caption-text\">React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30c6\u30b9\u30c8\u304c\u30d1\u30b9\u3057\u305f\u3053\u3068\u3092\u793a\u3059\u30c6\u30b9\u30c8\u7d50\u679c<\/figcaption><\/figure>\n<h3>\u30ab\u30d0\u30ec\u30c3\u30b8\u30ec\u30dd\u30fc\u30c8\u306e\u53d6\u5f97<\/h3>\n<p>Jest\u3067\u306f\u30ab\u30d0\u30ec\u30c3\u30b8\u30ec\u30dd\u30fc\u30c8\u3082\u53d6\u5f97\u3067\u304d\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u3069\u306e\u90e8\u5206\u3092\u30c6\u30b9\u30c8\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol start=\"1\">\n<li><code>--coverage<\/code>\u30aa\u30d7\u30b7\u30e7\u30f3\u3092Jest\u306b\u6e21\u3057\u307e\u3059\u3002<strong>package.json<\/strong>\uff08JavaScript\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u5185\uff09\u306eJest\u30b9\u30af\u30ea\u30d7\u30c8\u3067\u6307\u5b9a\u3057\u3001Jest\u30b3\u30de\u30f3\u30c9\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-json\">\"scripts\": {\n  \"test\": \"jest --coverage\"\n}<\/code><\/pre>\n<ol start=\"2\">\n<li><code>npm run test<\/code>\u3067\u30b3\u30fc\u30c9\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30ec\u30dd\u30fc\u30c8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ol>\n<figure style=\"width: 1183px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-test-coverage-report.png\" alt=\"\u30ab\u30d0\u30ec\u30c3\u30b8\u30ec\u30dd\u30fc\u30c8\u4f8b\" width=\"1183\" height=\"631\"><figcaption class=\"wp-caption-text\">\u30ab\u30d0\u30ec\u30c3\u30b8\u30ec\u30dd\u30fc\u30c8\u4f8b<\/figcaption><\/figure>\n<p>\u4e0a\u306e\u30ec\u30dd\u30fc\u30c8\u3067\u306f\u3001<strong>SubmitButton.js<\/strong>\u3068<strong>string-format.js<\/strong>\u306e\u95a2\u6570\u3092\u3059\u3079\u3066\u30c6\u30b9\u30c8\u3057\u305f\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001<strong>string-format.js<\/strong>\u306e\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3068\u884c\u306f\u30c6\u30b9\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3001<strong>string-format.js<\/strong>\u3067\u7db2\u7f85\u3055\u308c\u3066\u3044\u306a\u3044\u884c\u304c7\u884c\u306812\u884c\u3067\u3042\u308b\u3053\u3068\u3082\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>7\u884c\u76ee\u3001<code>truncate<\/code> \u95a2\u6570\u306e<code>return str<\/code>\u306f\u3001<code>if (str.length &lt;= count)<\/code>\u304c<code>false<\/code>\u3092\u8fd4\u3059\u305f\u3081\u3001\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>12\u884c\u76ee\u3001<code>truncate<\/code> \u95a2\u6570\u306e<code>return substring<\/code>\u306f\u3001<code>if (!withEllipsis)<\/code>\u304c<code>false<\/code>\u3092\u8fd4\u3059\u305f\u3081\u3001\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n<h2>\u958b\u767a\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306bJest\u3092\u7d71\u5408\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u958b\u767a\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306bJest\u3092\u7d71\u5408\u3057\u3001\u958b\u767a\u4f5c\u696d\u3092\u52b9\u7387\u5316\u3059\u308b\u65b9\u6cd5\u3082\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u30a6\u30a9\u30c3\u30c1\u30e2\u30fc\u30c9\u3067\u30c6\u30b9\u30c8\u3092\u5b9f\u884c<\/h3>\n<p>\u30a6\u30a9\u30c3\u30c1\u30e2\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30b3\u30fc\u30c9\u306e\u66f4\u65b0\u6642\u306b\u81ea\u52d5\u7684\u306b\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol start=\"1\">\n<li>\u30a6\u30a9\u30c3\u30c1\u30e2\u30fc\u30c9\u3092\u6709\u52b9\u306b\u3059\u308b\u306b\u306f\u3001<strong>package.json<\/strong>\uff08JavaScript \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\uff09\u306b<code>--watchAll<\/code>\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u8ffd\u52a0\u3057\u3066\u3001Jest\u30b3\u30de\u30f3\u30c9\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-json\">\"scripts\": {\n  \"test\": \"jest --coverage --watchAll\"\n}<\/code><\/pre>\n<ol start=\"2\">\n<li><code>npm run test<\/code>\u3092\u5b9f\u884c\u3057\u3001\u30a6\u30a9\u30c3\u30c1\u30e2\u30fc\u30c9\u3067Jest\u3092\u8d77\u52d5\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<figure style=\"width: 1197px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-watch-mode.png\" alt=\"\u30a6\u30a9\u30c3\u30c1\u30e2\u30fc\u30c9\u3067Jest\u3092\u5b9f\u884c\" width=\"1197\" height=\"730\"><figcaption class=\"wp-caption-text\">\u30a6\u30a9\u30c3\u30c1\u30e2\u30fc\u30c9\u3067Jest\u3092\u5b9f\u884c<\/figcaption><\/figure>\n<p>\u3053\u308c\u3067\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u5909\u66f4\u3059\u308b\u305f\u3073\u306b\u3001\u30c6\u30b9\u30c8\u304c\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30d3\u30eb\u30c9\u3059\u308b\u305f\u3073\u306b\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30b3\u30df\u30c3\u30c8\u524d\u306b\u30d5\u30c3\u30af\u3092\u8a2d\u5b9a<\/h3>\n<p>Git\u74b0\u5883\u3067\u306f\u3001\u7279\u5b9a\u306e\u30a4\u30d9\u30f3\u30c8\uff08pull\u3084push\u3001commit\u306a\u3069\uff09\u304c\u767a\u751f\u3059\u308b\u305f\u3073\u306b\u30d5\u30c3\u30af\u304c\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u30b3\u30df\u30c3\u30c8\u524d\u306b\u30d5\u30c3\u30af\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30df\u30c3\u30c8\u524d\u30a4\u30d9\u30f3\u30c8\uff08\u30b3\u30df\u30c3\u30c8\u3059\u308b\u524d\u306b\u30b3\u30fc\u30c9\u304c\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u30a4\u30d9\u30f3\u30c8\uff09\u306b\u5bfe\u3057\u3066\u5b9f\u884c\u3059\u308b\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30b3\u30df\u30c3\u30c8\u306f\u3001\u30b9\u30af\u30ea\u30d7\u30c8\u304c\u30a8\u30e9\u30fc\u3092\u6295\u3052\u306a\u3044\u5834\u5408\u306b\u306e\u307f\u6210\u529f\u3057\u307e\u3059\u3002<\/p>\n<p>pre-commit\u306e\u524d\u306bJest\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30df\u30c3\u30c8\u524d\u306b\u30c6\u30b9\u30c8\u304c\u5931\u6557\u3059\u308b\u306e\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/www.npmjs.com\/package\/ghooks\" target=\"_blank\" rel=\"noopener noreferrer\">ghooks<\/a>\u306a\u3069\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b<a href=\"https:\/\/kinsta.com\/jp\/blog\/git-hooks\/\">Git\u30d5\u30c3\u30af<\/a>\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<ol start=\"1\">\n<li><code>devDependencies<\/code>\u306b<code>ghooks<\/code>\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-bash\">npm install ghooks --save-dev<\/code><\/pre>\n<ol start=\"2\">\n<li><strong>package.json<\/strong>\u30d5\u30a1\u30a4\u30eb\u306e\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\uff08JavaScript\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u5185\uff09\u306b<code>configs<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n<li><code>configs<\/code>\u306e\u4e0b\u306b<code>ghooks<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<ol start=\"4\">\n<li>\u30ad\u30fc\u304c<code>pre-commit<\/code>\u3067\u3001\u5024\u304c<code>jest<\/code>\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-json\">{\n  \u2026\n  \"config\": {\n    \"ghooks\": {\n      \"pre-commit\": \"jest\"\n    }\n  },\n}<\/code><\/pre>\n<ol start=\"5\">\n<li>\u30b3\u30fc\u30c9\u3092\u30b3\u30df\u30c3\u30c8\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308apre-commit\u30d5\u30c3\u30af\u304c\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u3001Jest\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<figure style=\"width: 1183px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2023\/08\/jest-test-pre-commit.png\" alt=\"ghooks\u3092\u4f7f\u3063\u3066\u30b3\u30df\u30c3\u30c8\u524d\u306bJest\u3092\u5b9f\u884c\" width=\"1183\" height=\"803\"><figcaption class=\"wp-caption-text\">ghooks\u3092\u4f7f\u3063\u3066\u30b3\u30df\u30c3\u30c8\u524d\u306bJest\u3092\u5b9f\u884c<\/figcaption><\/figure>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>Jest\u3092\u958b\u767a\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306b\u7d71\u5408\u3057\u3001\u66f4\u65b0\u3059\u308b\u305f\u3073\u306b\u81ea\u52d5\u7684\u306b\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3067\u306f\u3001\u7d99\u7d9a\u7684\u306a\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001\u5909\u66f4\u3092\u672c\u756a\u74b0\u5883\u306b\u53cd\u6620\u3059\u308b\u524d\u306b\u3001\u30b3\u30fc\u30c9\u306e\u554f\u984c\u3092\u901f\u3084\u304b\u306b\u4fee\u6b63\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/sevalla.com\/application-hosting\/\">Kinsta\u306e\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b5\u30fc\u30d0\u30fc<\/a>\u306a\u3089\u3001Google Cloud Platform\u306e\u30d7\u30ec\u30df\u30a2\u30e0\u30c6\u30a3\u30a2\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3068C2\u30de\u30b7\u30f3\u4e0a\u306b\u69cb\u7bc9\u3055\u308c\u305f\u3001\u9ad8\u901f\u3067\u30bb\u30ad\u30e5\u30a2\u306a\u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u3067\u30a2\u30d7\u30ea\u3092\u30c7\u30d7\u30ed\u30a4\u53ef\u80fd\u3067\u3059\u3002\u3055\u3089\u306b\u3001\u4e16\u754c27\u7b87\u6240\u306e\u30c7\u30fc\u30bf\u30bb\u30f3\u30bf\u30fc\u3068300\u4ee5\u4e0a\u306ePoP\u3092\u8a87\u308bHTTP\/3\u5bfe\u5fdcCDN\u3082\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u9694\u96e2\u3055\u308c\u305f\u30b3\u30f3\u30c6\u30ca\u6280\u8853\u30012\u3064\u306e\u5f37\u529b\u306a\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3001Cloudflare\u306e\u9ad8\u5ea6\u306aDDoS\u5bfe\u7b56\u306b\u3088\u308a\u3001\u6700\u9ad8\u30ec\u30d9\u30eb\u306e\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3002<a href=\"https:\/\/kinsta.com\/jp\/docs\/kinsta-api\/\">Kinsta API<\/a>\u3067\u30a2\u30d7\u30ea\u3092\u7d71\u5408\u3057\u305f\u308a\u3001\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u3092\u81ea\u52d5\u5316\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Jest\u3092\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3057\u3001Kinsta\u3067\u904b\u7528\u3057\u3066\u3001<a href=\"https:\/\/kinsta.com\/javascript\/\">JavaScript\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/a>\u3092\u6b21\u306e\u30ec\u30d9\u30eb\u306b\u5f15\u304d\u4e0a\u3052\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30c6\u30b9\u30c8\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u3067\u907f\u3051\u3066\u901a &#8230;<\/p>\n","protected":false},"author":290,"featured_media":49927,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[777,778],"class_list":["post-49926","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-javascript-frameworks","topic-javascript-tutorials"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Jest\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30c6\u30b9\u30c8\u3059\u308b\u65b9\u6cd5\uff5cKinsta\u00ae<\/title>\n<meta name=\"description\" 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content=\"\u4eba\u6c17\u306e\u3042\u308bJest\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u6982\u8981\u3068\u6a5f\u80fd\u3001\u305d\u3057\u3066\u958b\u767a\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306b\u53d6\u308a\u5165\u308c\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u3054\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kinsta.com\/jp\/blog\/jest\/\" \/>\n<meta property=\"og:site_name\" content=\"Kinsta\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-01-03T09:41:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-01-04T13:12:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2023\/09\/jest.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1460\" \/>\n\t<meta property=\"og:image:height\" content=\"730\" 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content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"7\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/jest\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/kinsta.com\/jp\/blog\/jest\/\"},\"author\":{\"name\":\"Marcia 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