{"id":11087,"date":"2020-06-12T17:17:59","date_gmt":"2020-06-12T08:17:59","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=11087"},"modified":"2023-09-25T23:14:37","modified_gmt":"2023-09-25T14:14:37","slug":"%e3%80%90javascript%e3%80%91%e3%80%8cjest%e3%80%8d%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=11087","title":{"rendered":"\u3010JavaScript\u3011\u300cjest\u300d\u3001\u30e2\u30c3\u30af\u5316\u306a\u3069"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">jest\u3068\u306f\uff1f<\/h2>\n\n\n\n<ul>\n<li>\u8fd1\u5e74\u6700\u3082\u30dd\u30d4\u30e5\u30e9\u30fc\u306aJavaScript\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3059\u3002<\/li>\n\n\n\n<li>facebook\u304c\u4f5c\u3063\u3066\u304a\u308aReact\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u5143\u3005\u306fFacebook\u306e\u793e\u5185\u306e\u307f\u3067\u4f7f\u308f\u308c\u3044\u307e\u3057\u305f\u304c2013\u5e74\u306b\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u5316\u3055\u308c\u307e\u3057\u305f\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Jest\u306e\u7279\u5fb4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u30bc\u30ed\u30b3\u30f3\u30d5\u30a3\u30b0<\/h3>\n\n\n\n<p>\u7d30\u304b\u3044\u8a2d\u5b9a\u3092\u884c\u3046\u3053\u3068\u306a\u304f\u52d5\u4f5c\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8<\/h3>\n\n\n\n<p>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8ffd\u8de1\u3059\u308b\u30c6\u30b9\u30c8\u304c\u7c21\u5358\u306b\u66f8\u3051\u308b\u3002\u8907\u96d1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3084UI\u306e\u72b6\u614b\u3092\u30c6\u30b9\u30c8\u3059\u308b\u306e\u306f\u57fa\u672c\u96e3\u3057\u3044\u304c\u3053\u306e\u6a5f\u80fd\u3092\u4f7f\u3048\u3070\u7c21\u5358\u306b\u30c6\u30b9\u30c8\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<p>\u4e00\u5ea6\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u3092\u53d6\u5f97\u3059\u308c\u3070\u4ee5\u964d\u306e\u5909\u66f4\u3092\u8ffd\u8de1\u3001\u78ba\u8a8d\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u72ec\u7acb\u7684<\/h3>\n\n\n\n<p>\u72ec\u7acb\u3057\u3066\u8907\u6570\u306e\u30c6\u30b9\u30c8\u3092\u4e26\u5217\u5b9f\u884c\u3057\u3066\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u512a\u308c\u305fAPI<\/h3>\n\n\n\n<p>\u30c6\u30b9\u30c8\u30c4\u30fc\u30eb\u304cAPI\u3068\u3057\u3066\u6574\u7406\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6ce8\u610f\u70b9<\/h2>\n\n\n\n<p>ES6\u306b\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u306e\u3067babel\u3068\u4e00\u7dd2\u306b\u5c0e\u5165\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b9f\u969b\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u306e\u30c6\u30b9\u30c8\u3092\u7528\u3044\u305f\u30c6\u30b9\u30c8\u306f\u3067\u304d\u306a\u3044\u3002<\/h3>\n\n\n\n<p>jsdom\u3068\u3044\u3046node\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u4eee\u60f3\u7684\u306a\u30d6\u30e9\u30a6\u30b6\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30d6\u30e9\u30a6\u30b6\u74b0\u5883\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30c8\u3057\u307e\u3059\u304c\u3001\u5b9f\u969b\u306e\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067\u306e\u30c6\u30b9\u30c8\u306f\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u306a\u306e\u3067\u7279\u5b9a\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u306e\u307f\u767a\u751f\u3059\u308b\u3088\u3046\u306a\u30d0\u30b0\u306e\u691c\u77e5\u306f\u3067\u304d\u306a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ed6\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u306e\u6bd4\u8f03<\/h2>\n\n\n\n<p>2018\u5e74\u3054\u308d\u307e\u3067\u306f\u3053\u308c\u3089\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068Github\u30b9\u30bf\u30fc\u6570\u306f\u5927\u5dee\u306a\u304b\u3063\u305f\u304c\u30012018\u5e74\u4ee5\u964d\u304b\u3089Jest\u304c\u6025\u4e0a\u6607\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u3089\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e2\u500d\u7a0b\u5ea6\u306e\u30b9\u30bf\u30fc\u6570\u306b\u306a\u3063\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mocha<\/h3>\n\n\n\n<ul>\n<li>\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u3057\u3066\u306f\u6700\u5c0f\u9650\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b<\/li>\n\n\n\n<li>\u305d\u306e\u4ed6\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u67d4\u8edf\u306a\u8a2d\u5b9a\u304c\u53ef\u80fd\u3060\u304c\u3001\u8a2d\u5b9a\u304c\u8907\u96d1\u306b\u306a\u308b\u3053\u3068\u304c\u591a\u3044\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">jasmine<\/h3>\n\n\n\n<ul>\n<li>Angular\u306e\u6a19\u6e96\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af<\/li>\n\n\n\n<li>\u57fa\u672c\u6a5f\u80fd\u306a\u5099\u308f\u3063\u3066\u3044\u308b\u304c\u3001Jest\u306b\u6bd4\u3079\u3066\u4e00\u90e8\u9ad8\u5ea6\u306a\u6a5f\u80fd\uff08\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u6a5f\u80fd\u306a\u3069\uff09\u304c\u5099\u308f\u3063\u3066\u3044\u306a\u3044\u3002<\/li>\n\n\n\n<li>\u5b9f\u884c\u901f\u5ea6\u304c\u9045\u3044\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">typescript\u306e\u5834\u5408<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>npm i -D jest @types\/jest ts-jest<\/code><\/pre>\n\n\n\n<p>typescript\u306e\u30b3\u30fc\u30c9\u3092\u30c6\u30b9\u30c8\u3059\u308b\u5834\u5408\u306fts-jest\u3068\u3044\u3046\u30d1\u30c3\u30b1\u30fc\u30b8\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u8a2d\u5b9a<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">typescript\u306e\u5834\u5408<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>npx ts-jest config:init<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8a18\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u300cjest.config.js\u300d\u3068\u3044\u3046\u30d5\u30a1\u30a4\u30eb\u304c\u81ea\u52d5\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">jest.config.js<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\/** @type {import('ts-jest').JestConfigWithTsJest} *\/\r\nmodule.exports = {\r\n  preset: 'ts-jest',\r\n  testEnvironment: 'node',\r\n};<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">preset<\/h4>\n\n\n\n<p>\u4e00\u9023\u306e\u8a2d\u5b9a\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u3067\u3059\u3002ts-jest\u3067\u3042\u308c\u3070TypeScript\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306e\u4e00\u9023\u306e\u8a2d\u5b9a\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">testEnvironment<\/h4>\n\n\n\n<p>Jest\u304c\u3069\u306e\u74b0\u5883\u3067\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002node\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308c\u3070node-js\u74b0\u5883\u3067\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u914d\u7f6e\u5834\u6240<\/h2>\n\n\n\n<p><span style=\"color: #ff0000;\"><strong>\u300c__tests__\u300d<\/strong><\/span>\u3068\u3044\u3046\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u914d\u7f6e\u3059\u308b\u3053\u3068\u3092\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30c6\u30b9\u30c8\u5b9f\u884c(\u30c6\u30b9\u30c8\u30e9\u30f3\u30ca\u30fc\u3068\u3057\u3066\u306e\u6a5f\u80fd)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u5168\u3066\u306e\u30c6\u30b9\u30c8\u3092\u5b9f\u884c<\/h3>\n\n\n\n<p>package.json\u306escript\u306b\u5b9a\u7fa9\u3057\u3066\u304a\u304f\u306e\u304c\u666e\u901a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">jest<\/pre>\n\n\n\n<p>or<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">npm test<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u7279\u5b9a\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u6307\u5b9a\u3057\u3066\u5b9f\u884c\uff08\u500b\u5225\u5b9f\u884c\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">jest \u30d5\u30a1\u30a4\u30eb\u306e\u30d5\u30eb\u30d1\u30b9<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u6307\u5b9a\u3057\u3066\u5b9f\u884c<\/h3>\n\n\n\n<p>\u30d5\u30eb\u30d1\u30b9\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u3068\u9055\u3044\u3001<span style=\"color: #ff0000;\"><strong>\u30d5\u30a1\u30a4\u30eb\u540d\u306b\u5408\u81f4\u3059\u308b\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308c\u3070\u5168\u3066\u5b9f\u884c\u3057\u307e\u3059\u3002<\/strong><\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">jest \u30d5\u30a1\u30a4\u30eb\u540d<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u30c6\u30b9\u30c8\u7d50\u679c<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"408\" height=\"217\" src=\"http:\/\/www.code-magagine.com\/wp-content\/uploads\/2023\/09\/image-27.png\" alt=\"\" class=\"wp-image-23133\" srcset=\"http:\/\/www.code-magagine.com\/wp-content\/uploads\/2023\/09\/image-27.png 408w, http:\/\/www.code-magagine.com\/wp-content\/uploads\/2023\/09\/image-27-300x160.png 300w\" sizes=\"(max-width: 408px) 100vw, 408px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Test Suites<\/h3>\n\n\n\n<p>\u6210\u529f\u3057\u305f\u30c6\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306e\u6570\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tests<\/h3>\n\n\n\n<p>\u30c6\u30b9\u30c8\u95a2\u6570\u3082\u3057\u304f\u306fit\u306e\u6570\u306e\u5408\u8a08\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SnapShots<\/h3>\n\n\n\n<p>Jest\u306e\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u30c6\u30b9\u30c8\u3092\u4f7f\u3063\u305f\u5408\u8a08\u6570\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Time<\/h3>\n\n\n\n<p>\u30c6\u30b9\u30c8\u5168\u4f53\u306e\u5b9f\u884c\u6642\u9593\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u6a5f\u80fd<\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">test case<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u671f\u5f85\u5024\u3068\u7d50\u679c\u3092\u5224\u5b9a\u3059\u308b\u6a5f\u80fd<\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">expect<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306e\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5<\/h2>\n\n\n\n<p>\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u5185\u306bconsole.log\u3092\u57cb\u3081\u8fbc\u3093\u3067\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308c\u3070\u30b3\u30f3\u30bd\u30fc\u30eb\u4e0a\u306b\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u5185\u306e\u5909\u6570\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">console.log(\u5909\u6570);<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3068\u7834\u68c4<\/h2>\n\n\n\n<p>describe\u3092\u5165\u308c\u5b50\u306b\u3057\u3066\u5165\u308c\u5b50\u306b\u306a\u3063\u305f\u306a\u304b\u306b\u305d\u308c\u305e\u308c\u4ed5\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>describe(\"outer\", () => {\n  beforeEach(() => {\n    console.log(\"outer beforeEach\");\n  });\n\n  afterEach(() => {\n    console.log(\"outer afterEach\");\n  });\n\n  beforeAll(() => {\n    console.log(\"outer beforeAll\");\n  });\n\n  afterAll(() => {\n    console.log(\"outer afterAll\");\n  });\n\n  it(\"outer test 1\", () => {\n    console.log(\"outer test 1\");\n  });\n\n\n  describe(\"inner\", () => {\n    beforeEach(() => {\n      console.log(\"inner beforeEach\");\n    });\n\n    afterEach(() => {\n      console.log(\"inner afterEach\");\n    });\n\n    beforeAll(() => {\n      console.log(\"inner beforeAll\");\n    });\n\n    afterAll(() => {\n      console.log(\"inner afterAll\");\n    });\n\n\u3000\u3000\/\/ \u3053\u306eit\u3067\u306fbeforeEach\u306f\u5916\u5074\u3068\u5185\u5074\u3067\u4e8c\u56de\u5b9f\u884c\u3055\u308c\u308b\u3002\n    it(\"inner test 1\", () => {\n      console.log(\"inner test 1\");\n    });\n\n  });\n});\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">beforeEach<\/h3>\n\n\n\n<p>\u5404\u30c6\u30b9\u30c8(it)\u306e\u524d\u306b\u5b9f\u884c\u3055\u308c\u308b\u3002\u306a\u304a\u3001describe\u3092\u5165\u308c\u5b50\u306b\u3057\u305f\u5834\u5408\u306f\u3053\u308c\u3060\u3051\u306f\u5185\u5074\u306edescribe\u306e\u969b\u3082\u5916\u5074\u306edescribe\u306e\u5185\u5bb9\u3082\u4e8c\u91cd\u306b\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u6ce8\u610f\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">afterEach<\/h3>\n\n\n\n<p>\u5404\u30c6\u30b9\u30c8(it)\u306e\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">beforeAll<\/h3>\n\n\n\n<p>\u30d5\u30a1\u30a4\u30eb\u5185\u306e\u5168\u3066\u306e\u30c6\u30b9\u30c8\u306e\u524d\u306b1\u5ea6\u3060\u3051\u5b9f\u884c\u3055\u308c\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">afterEach<\/h3>\n\n\n\n<p>\u30d5\u30a1\u30a4\u30eb\u5185\u306e\u5168\u3066\u306e\u30c6\u30b9\u30c8\u306e\u5f8c\u306b1\u5ea6\u3060\u3051\u5b9f\u884c\u3055\u308c\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30e2\u30c3\u30af\u3068\u30b9\u30d1\u30a4\u306e\u9055\u3044<\/h2>\n\n\n\n<p>\u30e2\u30c3\u30af\u3068\u30b9\u30d1\u30a4\u306e\u9055\u3044\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3060\u3001Jest\u3067\u306f\u30e2\u30c3\u30af\u3068\u30b9\u30d1\u30a4\u306e\u6a5f\u80fd\u304c\u4e00\u90e8\u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d7\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30e2\u30c3\u30af<\/h3>\n\n\n\n<ul>\n<li>\u30c6\u30b9\u30c8\u306e\u4e8b\u524d\u6bb5\u968e\u3067\u6a21\u5023\u3059\u308b\u632f\u308b\u821e\u3044\u3092\u5b9a\u7fa9\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u5b9f\u884c\u6642\u306b\u5b9f\u969b\u306e\u632f\u308b\u821e\u3044\u3068\u30e2\u30c3\u30af\u306e\u632f\u308b\u821e\u3044\u3092\u7f6e\u304d\u63db\u3048\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b9\u30d1\u30a4<\/h3>\n\n\n\n<p>\u30b9\u30d1\u30a4\u3068\u306f\u3001\u65e2\u5b58\u306e\u95a2\u6570\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u3092\u300c\u76e3\u8996\u300d\u3059\u308b\u3082\u306e\u3002\u30b9\u30d1\u30a4\u306e\u5bfe\u8c61\u304c\u300c\u3044\u3064\u30fb\u4f55\u56de\u30fb\u3069\u3093\u306a\u5f15\u6570\u3067\u300d\u547c\u3073\u51fa\u3055\u308c\u305f\u304b\u3092\u691c\u8a3c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<ul>\n<li>\u5b9f\u969b\u306e\u632f\u308b\u821e\u3044\u3092\u76e3\u8996\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u5b9f\u884c\u6642\u306b\u306f\u5b9f\u969b\u306e\u632f\u308b\u821e\u3044\u3092\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u7f6e\u304d\u63db\u3048\u306a\u3044\u3067\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u30e2\u30c3\u30af\u5316<\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">const mockFunc = jest.fn();\nexpect(mockFunc(\"\u3042\")).toBe(undefined);<\/pre>\n\n\n\n<p>\u3061\u306a\u307f\u306b\u3001\u30e2\u30c3\u30af\u95a2\u6570\uff08jest.fn\uff09\u306e\u623b\u308a\u5024\u306f\u4e00\u5f8b\u3067undefined\u306b\u306a\u308b\u306e\u3067\u4e0a\u8a18\u306e\u5b9f\u884c\u7d50\u679c\u306fOK\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30e2\u30c3\u30af\u95a2\u6570\u306e\u884c\u308f\u305b\u305f\u3044\u51e6\u7406\u5185\u5bb9\u3092\u8a2d\u5b9a\u3059\u308b\u3002<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>jest.fn(() => \"\u3044\");<\/code><\/pre>\n\n\n\n<p>\u3082\u3057\u304f\u306f<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">jest.fn().mockImplementation(() =&gt; \"\u3044\");<\/pre>\n\n\n\n<p>\u30e2\u30c3\u30af\u95a2\u6570\u306e\u51e6\u7406\u5185\u5bb9\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3002(\u30c7\u30d5\u30a9\u30eb\u30c8\u306fundefined\u306e\u305f\u3081\uff09<\/p>\n\n\n\n<p>mockImplementation\u3092\u4f7f\u3046\u3053\u3068\u3067\u5f8c\u304b\u3089\u5b9f\u88c5\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30e2\u30c3\u30af\u95a2\u6570\u306e\u623b\u308a\u5024\u3092\u5909\u66f4\u3059\u308b\u3002<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">mockReturnValue<\/h4>\n\n\n\n<p>\u4f55\u5ea6\u5b9f\u884c\u3057\u3066\u3082\u540c\u3058\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const mockFunc = jest.fn().mockReturnValue(\"\u623b\u308a\u5024\")\nexpect(mockFunc()).toBe(\"\u623b\u308a\u5024\") \/\/ \u6210\u529f\u3059\u308b\u3002\nexpect(mockFunc()).toBe(\"\u623b\u308a\u5024\") \/\/ \u6210\u529f\u3059\u308b\u3002<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">mockReturnValueOnce<\/h4>\n\n\n\n<p>Once\u3092\u4ed8\u3051\u308b\u3068\u4e00\u5ea6\u3060\u3051\u3057\u304b\u623b\u308a\u5024\u3092\u8fd4\u3055\u306a\u3044\u8a2d\u5b9a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const mockFunc = jest.fn().mockReturnValueOnce(\"\u623b\u308a\u5024\")\nexpect(mockFunc()).toBe(\"\u623b\u308a\u5024\") \/\/ \u6210\u529f\u3059\u308b\u3002\nexpect(mockFunc()).toBe(\"\u623b\u308a\u5024\") \/\/ \u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002\u4e8c\u5ea6\u76ee\u306e\u547c\u3073\u51fa\u3057\u306e\u623b\u308a\u5024\u306fundefined\u306b\u306a\u308a\u307e\u3059\u3002<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">mockResolvedValue<\/h4>\n\n\n\n<p>\u975e\u540c\u671f\u306e\u623b\u308a\u5024\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>it(\"\u975e\u540c\u671f\", async () => {\n  const mockFunc = jest.fn().mockResolvedValue(\"\u975e\u540c\u671f\u306e\u623b\u308a\u5024\")\n  const result = await mockFunc();\n  expect(result).toBe(\"\u975e\u540c\u671f\u306e\u623b\u308a\u5024\") \/\/ \u6210\u529f\u3059\u308b\u3002\n})<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b58\u5728\u3059\u308b\u95a2\u6570\u3092\u30e2\u30c3\u30af\u5316\u3059\u308b\u3002(spyOn)<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">const spy = jest.spyOn(Math, \"abs\").mockImplementation(() =&gt; 1);<\/pre>\n\n\n\n<p>spyOn\u3092\u4f7f\u3048\u3070\u4e0a\u8a18\u306e\u3088\u3046\u306b\u5b58\u5728\u3059\u308b\u95a2\u6570(Math.abs)\u3082\u30e2\u30c3\u30af\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306bspyOn\u3067\u76e3\u8996\u3057\u305fclass\u3084\u30e1\u30bd\u30c3\u30c9\u306b\u5bfe\u3057\u3066\u7d50\u679c\u3092\u30c6\u30b9\u30c8\u3092\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>export class Calculator {\r\n  sum(a: number, b: number): number {\r\n    return a + b;\r\n  }\r\n}\r\n\r\nit(\"spyon\",()=>{\r\n  const calc = new Calculator();\r\n  const sumSpy = jest.spyOn(calc,\"sum\"); \/\/ spy\u304c\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u95a2\u6570\u306b\u6191\u4f9d\u3059\u308b\u30a4\u30e1\u30fc\u30b8\r\n  calc.sum(2,3);\r\n  expect(sumSpy).toHaveBeenCalledTimes(1);\r\n  expect(sumSpy).toHaveBeenCalledWith(2,3);\n\n  \/\/ \u751f\u6210\u3057\u305fspy\u304c\u4ed6\u306e\u30c6\u30b9\u30c8\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u306a\u3044\u3088\u3046\u306bspy\u3092\u89e3\u9664\u3059\u308b\uff08\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u95a2\u6570\u306b\u623b\u3059\uff09\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002\n  \/\/ \u3082\u3057\u3001\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u304c\u591a\u3044\u5834\u5408\u306fafterEach\u3092\u5229\u7528\u3057\u3066\u81ea\u52d5\u7684\u306b\u6bce\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3067\u89e3\u9664\u3057\u307e\u3059\u3002\r\n  sumSpy.mockRestore();\r\n})<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">jest.fn\u3068spyOn\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">jest.fn\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h4>\n\n\n\n<ul>\n<li>\u5358\u7d14\u306b\u4f55\u3089\u304b\u306e\u975e\u540c\u671f\u51e6\u7406\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u9069\u5f53\u306a\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u3066\u304a\u304d\u305f\u3044\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">spyOn\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h4>\n\n\n\n<p>\u4f55\u304b\u3057\u3089\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u7279\u5b9a\u95a2\u6570\u3060\u3051\u7f6e\u304d\u63db\u3048\u305f\u3044\u5834\u5408\u306fjest.fn\u3088\u308aspyOn\u3067\u660e\u793a\u7684\u306b\u5b9a\u7fa9\u3057\u305f\u65b9\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<ul>\n<li>\u30ed\u30fc\u30ab\u30eb\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u30e1\u30bd\u30c3\u30c9removeItem\u304c\u547c\u3070\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u56de\u6570\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n\n\n\n<li>API\u306erequest\u304c\u547c\u3070\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n\n\n\n<li><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u30e2\u30b8\u30e5\u30fc\u30eb\u5168\u4f53\u306e\u30e2\u30c3\u30af\u5316<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">jest.mock<\/h4>\n\n\n\n<p>describe\u3084it\u306e\u4e2d\u3067\u306f\u306a\u304f\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u3067\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u3060\u30d1\u30b9\u3092\u6e21\u3057\u305f\u3060\u3051\u306e\u521d\u671f\u72b6\u614b\u3067\u306f\u5168\u3066\u306e\u95a2\u6570\u3001\u30e1\u30bd\u30c3\u30c9\u306f\u5b9f\u88c5\u3092\u6301\u305f\u306a\u3044\u30e2\u30c3\u30af\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import fs from \"fs\";\njest.mock(\"fs\"); \/\/ \u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u30d1\u30b9\u3092\u5f15\u6570\u306b\u6307\u5b9a\u3059\u308b\u3002\u3053\u306e\u6642\u70b9\u3067fs\u30e2\u30b8\u30e5\u30fc\u30eb\u306f\u30e2\u30c3\u30af\u5316\u3055\u308c\u308b\u3002\nconst mockFs = jest.mocked(fs);\/\/ TS\u3060\u3068fs\u304c\u30e2\u30b8\u30e5\u30fc\u30eb\u5316\u3055\u308c\u3066\u3044\u308b\u3068\u8a8d\u8b58\u3057\u3066\u304f\u308c\u306a\u3044\u306e\u3067mocked\u3067ts\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306b\u30e9\u30c3\u30d7\u3059\u308b\u3002\r\nmockFs.readFileSync.mockReturnValue(\"\u623b\u308a\u5024\") <\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">mockClear\u3001mockRestore\u3001mockReset<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">mockClear<\/h3>\n\n\n\n<p>mockFn.mock.calls\uff08\u30e2\u30c3\u30af\u304c\u547c\u3070\u308c\u305f\u56de\u6570\uff09\u3001mockFn.mock.instances\u3092\u521d\u671f\u5316\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">mockRestore<\/h3>\n\n\n\n<p>jest.spyOn\u306b\u3088\u3063\u3066\u4f5c\u6210\u3055\u308c\u305f\u30e2\u30c3\u30af\u3092\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u3082\u306e\u3078\u623b\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">mockReset<\/h3>\n\n\n\n<p>mockFn.mock\u3001mockFn.mock.calls\u3001mockFn.mock.instances\u3092\u521d\u671f\u5316\u3059\u308b\u3002\u307e\u305f\u3001mockImplementation\u3001mockReturnValue\u3067\u8a2d\u5b9a\u3057\u305f\u5b9f\u88c5\u3001\u623b\u308a\u5024\u3082\u521d\u671f\u5316<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30de\u30c3\u30c1\u30e3\u30fc<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">.not<\/h3>\n\n\n\n<p>\u691c\u8a3c\u3092\u5426\u5b9a\u3059\u308b\u30de\u30c3\u30c1\u30e3\u30fc\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expect(1+2).not.toBe(4);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">toBe<\/h3>\n\n\n\n<p>string\u3001number\u540c\u58eb\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u306f\u3053\u3061\u3089\u3067\u3082\u826f\u3044\u3002\u4ed5\u7d44\u307f\u7684\u306b\u306fJavaScript\u306eObject.is(===)\u3068\u540c\u7b49\u306e\u6bd4\u8f03\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u306a\u306e\u3067\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540c\u58eb\u306e\u6bd4\u8f03\u306ftoEqual\u3058\u3083\u306a\u3044\u3068\u3067\u304d\u306a\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expect(1+2).toBe(3);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">toEqual<\/h3>\n\n\n\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540c\u58eb\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u306f\u3053\u3061\u3089\u3092\u4f7f\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expect(&#91;1,2,3]).toEqual(&#91;1,2,3]);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">toStrictEqual<\/h3>\n\n\n\n<p>\u7d99\u627f\u5143\u3092\u542b\u3080\u53b3\u5bc6\u306a\u6bd4\u8f03\u3092\u3059\u308b\u3002ES6\u4ee5\u964d\u3067\u5c0e\u5165\u3055\u308c\u305fclass\u69cb\u6587\u306a\u3069\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u4f7f\u3048\u305d\u3046\u3067\u3059\u3002\uff08\u3042\u307e\u308a\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u958b\u767a\u3067\u4f7f\u3046\u6a5f\u4f1a\u306f\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\uff09<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">toBeNull<\/h3>\n\n\n\n<p>null\u306b\u306a\u308b\u304b\u691c\u8a3c\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span id=\"toc6\">toBeTruthy<\/span><\/h3>\n\n\n\n<p>true\u306b\u306a\u308b\u304b\u691c\u8a3c\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span id=\"toc7\">toBeFalsy<\/span><\/h3>\n\n\n\n<p>false\u306b\u306a\u308b\u304b\u691c\u8a3c\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span id=\"toc12\">toMatch<\/span><\/h3>\n\n\n\n<p>\u6b63\u898f\u8868\u73fe\u3067\u30de\u30c3\u30c1\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span id=\"toc13\">toContain<\/span><\/h3>\n\n\n\n<p>\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u306b\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u691c\u8a3c\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">toThrow<\/h3>\n\n\n\n<p>\u4f8b\u5916\u3092throw\u3059\u308b\u304b\u3082\u30c6\u30b9\u30c8\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">toHaveBeenCalled<\/h3>\n\n\n\n<p>\u30e2\u30c3\u30af\u95a2\u6570\u304c\u5b9f\u884c\u3055\u308c\u305f\u304b\u30c6\u30b9\u30c8\u3067\u304d\u307e\u3059\u3002\u6ce8\u610f\u70b9\u3068\u3057\u3066\u306f\u3001\u666e\u901a\u306e\u95a2\u6570\u3060\u3068\u547c\u3073\u51fa\u3057\u306b\u5931\u6557\u3057\u307e\u3059\u3002\u30e2\u30c3\u30af\u95a2\u6570\u304b\u30b9\u30d1\u30a4\u3058\u3083\u306a\u3044\u3068\u30c0\u30e1\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>it(\"\u30e2\u30c3\u30af\u95a2\u6570\u304c\u547c\u3073\u51fa\u3055\u308c\u308b\u304b\",()=>{\r\n    const mockFunc = jest.fn();\r\n    mockFunc();\r\n    expect(mockFunc).toHaveBeenCalled();\r\n  })<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">toHaveBeenCalledtimes<\/h3>\n\n\n\n<p>\u30e2\u30c3\u30af\u95a2\u6570\u304c\u547c\u3070\u308c\u308b\u56de\u6570\u3092\u30c6\u30b9\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>it(\"\u30e2\u30c3\u30af\u95a2\u6570\u304c2\u56de\u547c\u3073\u51fa\u3055\u308c\u308b\u3002\",()=>{\r\n  const mockFunc = jest.fn();\r\n  mockFunc();\r\n  mockFunc();\r\n  expect(mockFunc).toHaveBeenCalledTimes(2);\r\n})<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">toHaveBeenCalledWith<\/h3>\n\n\n\n<p>\u30e2\u30c3\u30af\u95a2\u6570\u306b\u6e21\u3055\u308c\u308b\u5f15\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>it(\"\u30e2\u30c3\u30af\u95a2\u6570\u306b\u6e21\u3055\u308c\u308b\u5f15\u6570\u30c1\u30a7\u30c3\u30af\",()=>{\r\n    const mockFunc = jest.fn();\r\n    mockFunc(\"\u3042\u3042\u3042\");\r\n    expect(mockFunc).toHaveBeenCalledWith(\"\u3042\u3042\u3042\");\r\n  })<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u30c6\u30b9\u30c8\u5bfe\u8c61\u95a2\u6570<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>export function kansu(a: number, b: number) {\r\n  if (b === 0) throw new Error(\"0\u3067\u5272\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\");\r\n  return a\/ b;\r\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>expect(()=>divide(10,0)).toThrow(\"0\u3067\u5272\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\")<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d1\u30e9\u30e1\u30bf\u30e9\u30a4\u30ba\u30c9\u30c6\u30b9\u30c8<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>function sum(a: number, b: number): number {\r\n    return a + b;\r\n}\r\n\r\nit.each`\r\n  a    | b    | expected\r\n  ${2} | ${3} | ${5}\r\n  ${3} | ${-5} | ${-2}\r\n`(\"$a\u3068$b\u3092\u8db3\u3059\u3068$expected\u306b\u306a\u308b\", ({a,b,expected})=>{\r\n    expect(sum(a,b)).toBe(expected)\r\n});<\/code><\/pre>\n\n\n\n<p>\u540c\u3058\u95a2\u6570\u5185\u3067\u5c11\u3057\u5f15\u6570\u3092\u5909\u3048\u3066\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3092\u66f8\u304d\u305f\u304f\u306a\u308b\u30b1\u30fc\u30b9\u306f\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u306f\u30d1\u30e9\u30e1\u30bf\u30e9\u30a4\u30ba\u30c9\u30c6\u30b9\u30c8\u3068\u3044\u3046\u8a18\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u3068\u307e\u3068\u3081\u3066\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u666e\u901a\u306b\u500b\u3005\u306b\u6307\u5b9a\u3059\u308b\u306e\u3068\u540c\u3058\u8a18\u8ff0\u65b9\u6cd5\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"422\" height=\"167\" src=\"http:\/\/www.code-magagine.com\/wp-content\/uploads\/2023\/09\/image-28.png\" alt=\"\" class=\"wp-image-23151\" srcset=\"http:\/\/www.code-magagine.com\/wp-content\/uploads\/2023\/09\/image-28.png 422w, http:\/\/www.code-magagine.com\/wp-content\/uploads\/2023\/09\/image-28-300x119.png 300w\" sizes=\"(max-width: 422px) 100vw, 422px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"jest\u3068\u306f\uff1f Jest\u306e\u7279\u5fb4 \u30bc\u30ed\u30b3\u30f3\u30d5\u30a3\u30b0 \u7d30\u304b\u3044\u8a2d\u5b9a\u3092\u884c\u3046\u3053\u3068\u306a\u304f\u52d5\u4f5c\u3059\u308b\u3002 \u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8 \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8ffd\u8de1\u3059\u308b\u30c6\u30b9\u30c8\u304c\u7c21\u5358\u306b\u66f8\u3051\u308b\u3002\u8907\u96d1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3084UI\u306e\u72b6\u614b\u3092\u30c6\u30b9\u30c8\u3059\u308b\u306e\u306f\u57fa\u672c\u96e3\u3057\u3044\u304c\u3053\u306e\u6a5f\u80fd\u3092 [&hellip;]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/11087"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11087"}],"version-history":[{"count":47,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/11087\/revisions"}],"predecessor-version":[{"id":23190,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/11087\/revisions\/23190"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11087"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11087"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11087"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}