{"id":554,"date":"2026-07-12T11:33:56","date_gmt":"2026-07-12T02:33:56","guid":{"rendered":"https:\/\/www.marchboy.xyz\/wordpress\/archives\/554"},"modified":"2026-07-12T12:06:56","modified_gmt":"2026-07-12T03:06:56","slug":"%e3%83%86%e3%82%b9%e3%83%88%e3%83%95%e3%83%ac%e3%83%bc%e3%83%a0%e3%83%af%e3%83%bc%e3%82%afjest%e3%81%a8%e3%81%af","status":"publish","type":"post","link":"https:\/\/www.marchboy.xyz\/wordpress\/archives\/554","title":{"rendered":"\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30afJest\u3068\u306f"},"content":{"rendered":"<h2>Jest\u3068\u306f\u4f55\u304b<\/h2>\n<p>Jest\u306fFacebook\uff08\u73feMeta\uff09\u304c\u958b\u767a\u3057\u305fJavaScript\u5411\u3051\u306e\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3059\u3002\u4e3b\u306bReact\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30c6\u30b9\u30c8\u3067\u5229\u7528\u3055\u308c\u307e\u3059\u304c\u3001Node.js\u3084Vue\u3001Angular\u306a\u3069\u5e45\u5e83\u3044\u74b0\u5883\u3067\u3082\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u4e3b\u306a\u7279\u5fb4<\/h3>\n<ul>\n<li><strong>Zero configuration<\/strong>\uff1a\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306a\u3057\u3067\u5373\u5ea7\u306b\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u30c6\u30b9\u30c8<\/strong>\uff1aUI\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u51fa\u529b\u3092\u4fdd\u5b58\u3057\u3001\u5909\u66f4\u304c\u3042\u3063\u305f\u5834\u5408\u306b\u691c\u77e5\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u30e2\u30c3\u30af\u6a5f\u80fd<\/strong>\uff1a\u95a2\u6570\u3084\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u7c21\u5358\u306b\u30e2\u30c3\u30af\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u9ad8\u901f\u306a\u30c6\u30b9\u30c8\u5b9f\u884c<\/strong>\uff1a\u30c6\u30b9\u30c8\u306e\u4e26\u5217\u5b9f\u884c\u3084\u30ad\u30e3\u30c3\u30b7\u30e5\u6a5f\u69cb\u306b\u3088\u308a\u9ad8\u901f\u306b\u52d5\u4f5c\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3068\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306bJest\u3092\u5c0e\u5165\u3059\u308b\u306b\u306fnpm\u307e\u305f\u306fyarn\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code>npm install --save-dev jest\n# \u307e\u305f\u306f\nyarn add --dev jest<\/code><\/pre>\n<p>\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u5f8c\u3001<strong>package.json<\/strong>\u306b\u30c6\u30b9\u30c8\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n<pre><code>{\n  \\\"scripts\\\": {\n    \\\"test\\\": \\\"jest\\\"\n  }\n}<\/code><\/pre>\n<p>\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306f\u901a\u5e38<code>*.test.js<\/code>\u307e\u305f\u306f<code>*.spec.js<\/code>\u3068\u3044\u3046\u540d\u524d\u3067\u4f5c\u6210\u3057\u3001<code>__tests__<\/code>\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u7f6e\u304d\u307e\u3059\u3002<\/p>\n<h3>\u7c21\u5358\u306a\u30c6\u30b9\u30c8\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u306f\u95a2\u6570<code>sum<\/code>\u306e\u30c6\u30b9\u30c8\u4f8b\u3067\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ sum.js\nfunction sum(a, b) {\n  return a + b;\n}\nmodule.exports = sum;<\/code><\/pre><\/div>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ sum.test.js\nconst sum = require(&#39;.\/sum&#39;);\n\ntest(&#39;adds 1 + 2 to equal 3&#39;, () =&gt; {\n  expect(sum(1, 2)).toBe(3);\n});<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b3\u30de\u30f3\u30c9<code>npm test<\/code>\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001Jest\u304c\u81ea\u52d5\u7684\u306b\u30c6\u30b9\u30c8\u3092\u691c\u51fa\u3057\u3001\u7d50\u679c\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>$ npm test\n\n&gt; jest-demo@1.0.0 test\n&gt; jest\n\n PASS  .\/sum.test.js\n  \u2713 adds 1 + 2 to equal 3 (3 ms)\n\nTest Suites: 1 passed, 1 total\nTests:       1 passed, 1 total\nSnapshots:   0 total\nTime:        0.384 s\nRan all test suites.<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u4f8b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u51fa\u529b\u3092\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u3068\u3057\u3066\u4fdd\u5b58\u3057\u3001\u5c06\u6765\u7684\u306a\u5909\u66f4\u3092\u691c\u51fa\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ Button.js\nimport React from &#39;react&#39;;\n\nexport default function Button({ label }) {\n  return &lt;button&gt;{label}&lt;\/button&gt;;\n}<\/code><\/pre><\/div>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ Button.test.js\nimport React from &#39;react&#39;;\nimport renderer from &#39;react-test-renderer&#39;;\nimport Button from &#39;.\/Button&#39;;\n\ntest(&#39;Button renders correctly&#39;, () =&gt; {\n  const tree = renderer\n    .create(&lt;Button label=&quot;Click me&quot; \/&gt;)\n    .toJSON();\n  expect(tree).toMatchSnapshot();\n});<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u521d\u56de\u5b9f\u884c\u6642\u306b\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u304c<code>__snapshots__<\/code>\u30d5\u30a9\u30eb\u30c0\u306b\u4fdd\u5b58\u3055\u308c\u3001\u4ee5\u964d\u306e\u5b9f\u884c\u3067\u5dee\u5206\u304c\u3042\u308c\u3070\u30c6\u30b9\u30c8\u304c\u5931\u6557\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Jest\u306f\u8a2d\u5b9a\u304c\u7c21\u5358\u3067\u3001\u30e2\u30c3\u30af\u30fb\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u30fb\u4e26\u5217\u5b9f\u884c\u306a\u3069\u8c4a\u5bcc\u306a\u6a5f\u80fd\u3092\u5099\u3048\u305f\u5f37\u529b\u306a\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3059\u3002JavaScript\/TypeScript\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u30c6\u30b9\u30c8\u3092\u5c0e\u5165\u3057\u305f\u3044\u5834\u5408\u3001\u307e\u305a\u306fJest\u3092\u8a66\u3057\u3066\u307f\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jest\u3068\u306f\u4f55\u304b Jest\u306fFacebook\uff08\u73feMeta\uff09\u304c\u958b\u767a\u3057\u305fJavaScript\u5411\u3051\u306e\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3059\u3002\u4e3b\u306bReact\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30c6\u30b9\u30c8\u3067\u5229\u7528\u3055\u308c\u307e\u3059\u304c\u3001Node.js\u3084Vue\u3001Angular\u306a\u3069\u5e45 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-554","post","type-post","status-publish","format-standard","hentry","category-web"],"_links":{"self":[{"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/posts\/554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/comments?post=554"}],"version-history":[{"count":7,"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/posts\/554\/revisions"}],"predecessor-version":[{"id":561,"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/posts\/554\/revisions\/561"}],"wp:attachment":[{"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/media?parent=554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/categories?post=554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.marchboy.xyz\/wordpress\/wp-json\/wp\/v2\/tags?post=554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}