{"id":3496,"date":"2020-06-25T15:29:32","date_gmt":"2020-06-25T07:29:32","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=2393"},"modified":"2020-06-25T15:29:32","modified_gmt":"2020-06-25T07:29:32","slug":"lwc%e6%b5%8b%e8%af%95-%e5%86%99%e4%b8%80%e4%b8%aajest%e6%b5%8b%e8%af%95-2","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3496","title":{"rendered":"\u95ea\u7535Web\u7ec4\u4ef6\u6d4b\u8bd5 &#8211; \u5199\u4e00\u4e2aJest\u6d4b\u8bd5"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"learning-objectives\">\u5b66\u4e60\u76ee\u6807<\/h2>\n<p>\u5b8c\u6210\u672c\u5355\u5143\u540e\uff0c\u60a8\u5c06\u80fd\u591f\uff1a<\/p>\n<ul>\n<li>\u7f16\u5199\u6d4b\u8bd5\u4ee5\u9a8c\u8bc1\u60a8\u7684\u8bbe\u7f6e\u3002<\/li>\n<li>\u7f16\u5199\u5931\u8d25\u7684\u6d4b\u8bd5\uff0c\u7136\u540e\u66f4\u6539\u7ec4\u4ef6\u4ee5\u4f7f\u5176\u901a\u8fc7\u3002<\/li>\n<li>\u8bc6\u522b\u57fa\u672c\u7684Jest\u547d\u4ee4\u3002<\/li>\n<li>\u89e3\u91ca\u751f\u547d\u5468\u671f\u6302\u94a9\u3002<\/li>\n<\/ul>\n<h2 id=\"start-with-a-lightning-web-component\">\u4eceLightning Web\u7ec4\u4ef6\u5f00\u59cb<\/h2>\n<p>\u8981\u6d4b\u8bd5Lightning Web\u7ec4\u4ef6\uff0c\u6211\u4eec\u9996\u5148\u5fc5\u987b\u6709\u4e00\u4e2a\u8981\u6d4b\u8bd5\u7684\u7ec4\u4ef6\u3002<\/p>\n<p><strong>\u521b\u5efa\u4e00\u4e2a\u95ea\u7535Web\u7ec4\u4ef6<\/strong><\/p>\n<ol>\n<li>\u5728Visual Studio Code\u4e2d\uff0c\u901a\u8fc7\u6309<strong>Ctrl + Shift + P<\/strong>\u00a0\uff08Windows\uff09\u6216<strong>Cmd + Shift + P<\/strong>\u00a0\uff08macOS\uff09\u6253\u5f00\u547d\u4ee4\u9762\u677f\u3002<\/li>\n<li>\u8f93\u5165<code>lightning web<\/code>\u3002<\/li>\n<li>\u9009\u62e9<strong>SFDX\uff1a\u521b\u5efaLightning Web\u7ec4\u4ef6<\/strong>\u3002\u4e0d\u8981\u4f7f\u7528<strong>SFDX\uff1a\u521b\u5efa\u95ea\u7535\u7ec4\u4ef6<\/strong>\u3002\uff08\u8fd9\u5c06\u521b\u5efa\u4e00\u4e2aAura\u7ec4\u4ef6\u3002\uff09<\/li>\n<li>\u8f93\u5165<code>unitTest<\/code>\u65b0\u7ec4\u4ef6\u7684\u540d\u79f0\u3002<\/li>\n<li>\u6309<strong>Enter\u952e<\/strong>\u3002<\/li>\n<li>\u518d\u6b21\u6309<strong>Enter<\/strong>\u63a5\u53d7\u9ed8\u8ba4\u503c<code>force-app\/main\/default\/lwc<\/code>\u3002<\/li>\n<\/ol>\n<p>\u8fd9\u5c06\u5728lwc\u76ee\u5f55\u4e2d\u4f7f\u7528\u521d\u59cb\u57fa\u672c\u6587\u4ef6\u521b\u5efaunitTest\u76ee\u5f55\u3002<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"image image-block\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/modules\/test-lightning-web-components\/write-a-jest-test\/images\/c11fcae9b84a0709a4fe72d4c39a6322_2-ac-6954-a-4-b-97-4425-9723-51464027-baf-2.png\" alt=\"test-lwc\u9879\u76ee\u4e2d\u7684unitTest\u76ee\u5f55\u3002\" width=\"281\" height=\"380\" \/><\/p>\n<h2 id=\"write-a-basic-test\">\u7f16\u5199\u57fa\u672c\u6d4b\u8bd5<\/h2>\n<p>\u73a9\u7b11\u6d4b\u8bd5\u7684\u7f16\u5199\uff0c\u4fdd\u5b58\u548c\u8fd0\u884c\u65b9\u5f0f\u4e0e\u4e3aAura Components\u7684\u95ea\u7535\u6d4b\u8bd5\u670d\u52a1\u7f16\u5199\u7684\u8309\u8389\u6216\u6469\u5361\u6d4b\u8bd5\u4e0d\u540c\u3002Jest\u6d4b\u8bd5\u4ec5\u5728\u672c\u5730\u8fdb\u884c\uff0c\u5e76\u4e14\u72ec\u7acb\u4e8eSalesforce\u4fdd\u5b58\u548c\u8fd0\u884c\u3002\u5b9e\u9645\u4e0a\uff0c\u5982\u679c\u5c1d\u8bd5\u5c06Jest\u6d4b\u8bd5\u90e8\u7f72\u5230Salesforce\u7ec4\u7ec7\u4e2d\uff0c\u5219\u4f1a\u51fa\u73b0\u9519\u8bef\u3002\u5c3d\u7ba1\u9488\u5bf9Lightning Web\u7ec4\u4ef6\u7684Jest\u6d4b\u8bd5\u672a\u90e8\u7f72\u5230\u60a8\u7684Salesforce\u7ec4\u7ec7\u4e2d\uff0c\u4f46\u662f\u8bf7\u786e\u4fdd\u5c06\u5b83\u4eec\u4e0e\u7ec4\u4ef6\u672c\u8eab\u4e00\u8d77\u63d0\u4ea4\u5230\u7248\u672c\u63a7\u5236\u3002\u00a0<\/p>\n<p><strong>\u521b\u5efa__tests__\u6587\u4ef6\u5939<\/strong><\/p>\n<p>\u6d4b\u8bd5\u6587\u4ef6\u9700\u8981\u4e0e\u5176\u4ed6\u7ec4\u4ef6\u6587\u4ef6\u5206\u5f00\u3002\u5728\u7ec4\u4ef6\u7684bundle\u6587\u4ef6\u5939\u7684\u9876\u5c42\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a__tests__\u7684\u6587\u4ef6\u5939\u3002\u5c06\u6b64\u7ec4\u4ef6\u7684\u6240\u6709\u6d4b\u8bd5\u4fdd\u5b58\u5728__tests__\u6587\u4ef6\u5939\u4e2d\u3002\u00a0<\/p>\n<ol>\n<li>\u5728Visual Studio Code\u4e2d\uff0c\u53f3\u952e\u5355\u51fb<code>unitTest<\/code>\u76ee\u5f55\uff0c\u7136\u540e\u9009\u62e9\u201c<strong>\u65b0\u5efa\u6587\u4ef6\u5939\u201d<\/strong>\u3002<\/li>\n<li>\u8f93\u5165<code>__tests__<\/code>\u3002<\/li>\n<li>\u6309<strong>Enter\u952e<\/strong>\u3002<\/li>\n<\/ol>\n<p><strong>\u914d\u7f6e.forceignore<\/strong><\/p>\n<p>\u901a\u8fc7\u5c06__tests__\u6587\u4ef6\u5939\u63d0\u4ea4\u5230\u7248\u672c\u63a7\u5236\uff0c\u4e0e\u5176\u4ed6\u56e2\u961f\u6210\u5458\u6216\u7cfb\u7edf\u5171\u4eab\u6d4b\u8bd5\u3002\u5b83\u4eec\u662f\u60a8\u7684\u9879\u76ee\u548c\u6301\u7eed\u96c6\u6210\u8fc7\u7a0b\u7684\u91cd\u8981\u7ec4\u6210\u90e8\u5206\u3002\u4e3a\u4e86\u907f\u514d\u5c06\u5b83\u4eec\u90e8\u7f72\u5230Salesforce\uff0c.forceignore\u6587\u4ef6\u4e3a\u6b64\u8f93\u5165\u4e86\u4e00\u4e2a\u6392\u9664\u9879\u3002\u00a0<\/p>\n<ul>\n<li>\u786e\u4fdd\u60a8\u7684\u9879\u76ee<code>.forceignore<\/code>\u6587\u4ef6\u5305\u542b\u4ee5\u4e0b\u6392\u9664\u9879\u3002\u5982\u679c\u6ca1\u6709\uff0c\u8bf7\u6dfb\u52a0\u5b83\u5e76\u4fdd\u5b58\u6587\u4ef6\u3002\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"># LWC configuration files\n<span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span><span class=\"token operator\">\/<\/span>jsconfig<span class=\"token punctuation\">.<\/span>json\n<span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span><span class=\"token operator\">\/<\/span><span class=\"token punctuation\">.<\/span>eslintrc<span class=\"token punctuation\">.<\/span>json\n# LWC <span class=\"token class-name\">Jest<\/span>\n<span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span><span class=\"token operator\">\/<\/span>__tests__<span class=\"token comment\">\/**<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<\/ul>\n<p><strong>\u521b\u5efaJest\u6d4b\u8bd5\u6587\u4ef6<\/strong><\/p>\n<p>\u6211\u4eec\u7684\u7b2c\u4e00\u4e2a\u6d4b\u8bd5\u5f88\u7b80\u5355\u3002\u6211\u4eec\u6709\u4e00\u4e2a<code>sum()<\/code>\u51fd\u6570\uff0c\u5b83\u5e0c\u671b\u5c06\u4e24\u4e2a\u6570\u5b57\u76f8\u52a0\u5e76\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5b83\u3002<\/p>\n<ol>\n<li>\u5728Visual Studio Code\u4e2d\uff0c\u53f3\u952e\u5355\u51fb<code>__tests__<\/code>\u76ee\u5f55\uff0c\u7136\u540e\u9009\u62e9<strong>New File<\/strong>\u3002<\/li>\n<li>\u8f93\u5165<code>sum.test.js<\/code>\u3002<\/li>\n<li>\u6309<strong>Enter\u952e<\/strong>\u3002<\/li>\n<li>\u5728\u65b0\u7684\u6d4b\u8bd5\u6587\u4ef6\u4e2d\u8f93\u5165\u4ee5\u4e0b\u4ee3\u7801\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> sum <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'..\/sum'<\/span><span class=\"token punctuation\">;<\/span>\n  \n<span class=\"token function\">describe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'sum()'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'should add 1 and 2 returning 3'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4fdd\u5b58\u6587\u4ef6\u3002<\/li>\n<\/ol>\n<h2 id=\"run-the-test\">\u8fd0\u884c\u6d4b\u8bd5<\/h2>\n<ol>\n<li>\u5728Visual Studio Code\u4e2d\uff0c\u9009\u62e9\u201c<strong>\u67e5\u770b\u201d<\/strong>\u00a0\uff0c\u7136\u540e\u9009\u62e9\u201c<strong>\u7ec8\u7aef\u201d<\/strong>\u3002\u8fd9\u5c06\u5728Visual Studio Code\u4e2d\u6253\u5f00\u4e00\u4e2a\u7ec8\u7aef\u3002\u7ec8\u7aef\u9ed8\u8ba4\u4e3a\u5f53\u524d\u9879\u76ee\u7684\u9876\u7ea7\u76ee\u5f55\u3002<\/li>\n<li>\u5728\u7ec8\u7aef\u4e2d\uff0c\u4ece\u4e0a\u4e00\u4e2a\u5355\u5143\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">npm run test<span class=\"token operator\">:<\/span>unit<\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u7531\u4e8e\u7f3a\u5c11\u6c42\u548c\u51fd\u6570\uff0c\u6d4b\u8bd5\u5931\u8d25\u3002<\/li>\n<\/ol>\n<p>\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u89e3\u51b3\u5b83\u3002\u00a0<\/p>\n<ol>\n<li>\u5728Visual Studio Code\u4e2d\uff0c\u53f3\u952e\u5355\u51fb<code>unitTest<\/code>\u76ee\u5f55\uff0c\u7136\u540e\u9009\u62e9<strong>New File<\/strong>\u3002<\/li>\n<li>\u8f93\u5165<code>sum.js<\/code>\u3002<\/li>\n<li>\u6309<strong>Enter\u952e<\/strong>\u3002<\/li>\n<li>\u5728\u65b0\u6587\u4ef6\u4e2d\u8f93\u5165\u4ee5\u4e0b\u4ee3\u7801\u5757\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">export function <span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token keyword\">return<\/span> x <span class=\"token operator\">+<\/span> y<span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4fdd\u5b58\u6587\u4ef6\u3002<\/li>\n<li>\u5728\u7ec8\u7aef\u4e2d\u518d\u6b21\u8fd0\u884c\u6d4b\u8bd5\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">npm run test<span class=\"token operator\">:<\/span>unit<\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u6d4b\u8bd5\u901a\u8fc7\u3002<\/li>\n<\/ol>\n<p><br \/>\u606d\u559c\u4f60\uff01\u60a8\u521a\u521a\u786e\u8ba4Jest\u5df2\u5b89\u88c5\u5e76\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u6d4b\u8bd5\u4ee3\u7801\uff0c\u770b\u770b\u53d1\u751f\u4e86\u4ec0\u4e48\u3002<\/p>\n<div>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> sum <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'..\/sum'<\/span><span class=\"token punctuation\">;<\/span>\n  \n<span class=\"token function\">describe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'sum()'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'should add 1 and 2 returning 3'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/div>\n<ul>\n<li>\u7b2c1\u884c<code>sum<\/code>\u4ecesum JavaScript\u6587\u4ef6\u5bfc\u5165\u5bfc\u51fa\u7684\u51fd\u6570\u3002<\/li>\n<li>\u7b2c3\u884c\u662fJest\u6d4b\u8bd5\u5957\u4ef6\u7684\u5f00\u59cb\u3002\u8be5<code>describe<\/code>\u51fd\u6570\u6216\u5757\u662f\u4e00\u4e2a\u6d4b\u8bd5\u5957\u4ef6\uff0c\u5e76\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\u3002\u9996\u5148\u662f\u5bf9\u6211\u4eec\u8981\u6d4b\u8bd5\u7684\u5355\u4f4d\u7684\u63cf\u8ff0\uff0c\u901a\u5e38\u4ee5\u540d\u8bcd\u7684\u5f62\u5f0f\u51fa\u73b0\u3002\u7b2c\u4e8c\u4e2a\u662f\u4fdd\u5b58\u4e00\u4e2a\u6216\u591a\u4e2a\u6d4b\u8bd5\u7684\u56de\u8c03\u51fd\u6570\u3002\u60a8\u4e5f\u53ef\u4ee5\u5c06<code>describe<\/code>\u6d4b\u8bd5\u5957\u4ef6\u76f8\u4e92\u5d4c\u5957\u4ee5\u63d0\u9ad8\u6e05\u6670\u5ea6\u3002<\/li>\n<li>\u7b2c4\u884c\u662f\u6d4b\u8bd5\uff08<code>it<\/code>\u662f\u7684\u522b\u540d<code>test<\/code>\uff09\u3002\u8be5<code>it<\/code>\u51fd\u6570\u6216\u5757\u4e5f\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\u3002\u9996\u5148\u662f\u5bf9\u6211\u4eec\u671f\u671b\u7684\u53e6\u4e00\u79cd\u63cf\u8ff0\uff0c\u901a\u5e38\u4ee5\u52a8\u8bcd\u5f00\u5934\u3002\u7136\u540e\u662f\u4e00\u4e2a\u5efa\u7acb\u6d4b\u8bd5\u5e76\u4fdd\u5b58\u6d4b\u8bd5\u7684\u65ad\u8a00\u6216\u671f\u671b\u7684\u56de\u8c03\u51fd\u6570\u3002<\/li>\n<li>\u7b2c5\u884c\u662f<code>expect<\/code>\u58f0\u660e\u6210\u529f\u6761\u4ef6\u7684\u8bed\u53e5\uff1a\u8be5<code>sum<\/code>\u51fd\u6570\u5c06\u6dfb\u52a0\u4e24\u4e2a\u53c2\u65701\u548c2\uff0c\u5e76\u8fd4\u56de3\u3002\u5b83<code>toBe<\/code>\u662f\u8bb8\u591a\u00a0Jest\u5339\u914d\u5668\u4e4b\u4e00\u3002<br \/>\u5728\u7b2c5\u884c\u4e4b\u540e\u7684\u884c\u4e2d\u6dfb\u52a0\u53e6\u4e00\u4e2a\u65ad\u8a00\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">    <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>not<span class=\"token punctuation\">.<\/span><span class=\"token function\">toBeGreaterThan<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u6dfb\u52a0<code>.not<\/code>\u5e76<code>.toBeGreaterThan<\/code>\u786e\u4fdd\u8be5\u6570\u5b57\u4e0d\u5927\u4e8e3\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u6dfb\u52a0\u53e6\u4e00\u4e2aExpect\u8bed\u53e5<code>.not.toBeLessThan(3)<\/code>\u3002\u00a0<\/li>\n<\/ul>\n<p>\u73b0\u5728\u8fdb\u884cLightning Web\u7ec4\u4ef6\u6d4b\u8bd5\u3002<\/p>\n<p>\u5bf9Lightning Web\u7ec4\u4ef6\u7684Jest\u6d4b\u8bd5\u5e94\u8be5\u9694\u79bb\u6d4b\u8bd5\u5355\u4e2a\u7ec4\u4ef6\u7684\u884c\u4e3a\uff0c\u5e76\u4e14\u5bf9\u5916\u90e8\u7ec4\u4ef6\u6216\u670d\u52a1\u7684\u4f9d\u8d56\u6027\u6700\u5c0f\u3002<\/p>\n<p><strong>\u518d\u6b21\u6267\u884c\u8be5\u8fc7\u7a0b\u4ee5\u521b\u5efa<code>unitTest<\/code>\u6d4b\u8bd5\u6587\u4ef6<\/strong><\/p>\n<p>\u6b64\u6d4b\u8bd5\u5c06\u9a8c\u8bc1\u662f\u5426\u8bbe\u7f6e\u4e86\u5c5e\u6027\uff0c\u5e76\u5c06\u5176\u6dfb\u52a0\u5230DOM\u540e\u5c06\u663e\u793a\u6b63\u786e\u7684\u6587\u672c\u3002<\/p>\n<ol>\n<li>\u53f3\u952e\u5355\u51fb<code>__tests__<\/code>\u76ee\u5f55\uff0c\u7136\u540e\u9009\u62e9\u201c<strong>\u65b0\u5efa\u6587\u4ef6\u201d<\/strong>\u3002<\/li>\n<li>\u8f93\u5165<code>unitTest.test.js<\/code>\u3002<\/li>\n<li>\u6309<strong>Enter\u952e<\/strong>\u3002<\/li>\n<li>\u5728\u65b0\u7684\u6d4b\u8bd5\u6587\u4ef6\u4e2d\u8f93\u5165\u4ee5\u4e0b\u4ee3\u7801\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> createElement <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token class-name\">UnitTest<\/span> from <span class=\"token string\">'c\/unitTest'<\/span><span class=\"token punctuation\">;<\/span>\n  \n<span class=\"token function\">describe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'c-unit-test'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token function\">afterEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token comment\">\/\/ The jsdom instance is shared across test cases in a single file so reset the DOM<\/span>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>document<span class=\"token punctuation\">.<\/span>body<span class=\"token punctuation\">.<\/span>firstChild<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n      document<span class=\"token punctuation\">.<\/span>body<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeChild<\/span><span class=\"token punctuation\">(<\/span>document<span class=\"token punctuation\">.<\/span>body<span class=\"token punctuation\">.<\/span>firstChild<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token punctuation\">}<\/span>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  \n  <span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'displays unit status with default unitNumber'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token keyword\">const<\/span> element <span class=\"token operator\">=<\/span> <span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'c-unit-test'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span>\n      is<span class=\"token operator\">:<\/span> <span class=\"token class-name\">UnitTest<\/span>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>element<span class=\"token punctuation\">.<\/span>unitNumber<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token comment\">\/\/ Add the element to the jsdom instance<\/span>\n    document<span class=\"token punctuation\">.<\/span>body<span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>element<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token comment\">\/\/ Verify displayed greeting<\/span>\n    <span class=\"token keyword\">const<\/span> div <span class=\"token operator\">=<\/span> element<span class=\"token punctuation\">.<\/span>shadowRoot<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'div'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>div<span class=\"token punctuation\">.<\/span>textContent<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Unit 5 alive!'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4fdd\u5b58\u6587\u4ef6\u3002<\/li>\n<li>\u5728\u7ec8\u7aef\u4e2d\u518d\u6b21\u8fd0\u884c\u6d4b\u8bd5\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">npm run test<span class=\"token operator\">:<\/span>unit<\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u6d4b\u8bd5\u5931\u8d25\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token class-name\">Test<\/span> <span class=\"token class-name\">Suites<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span> failed<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> passed<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span> total\n<span class=\"token class-name\">Tests<\/span><span class=\"token operator\">:<\/span>       <span class=\"token number\">1<\/span> failed<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> passed<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span> total<\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<\/ol>\n<p>\u5728\u66f4\u65b0\u4ee3\u7801\u4ee5\u83b7\u5f97\u901a\u8fc7\u6d4b\u8bd5\u4e4b\u524d\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u6d4b\u8bd5\u4ee3\u7801\u4ee5\u4e86\u89e3\u9700\u6c42\u3002<\/p>\n<ul>\n<li>\u7b2c1\u884c\u662f\u65b0\u7684\u3002\u5b83<code>createElement<\/code>\u4ece<code>lwc<\/code>\u6846\u67b6\u5bfc\u5165\u65b9\u6cd5\u3002\u4ec5\u5728\u6d4b\u8bd5\u4e2d\u53ef\u7528\u3002<\/li>\n<li>\u7b2c2\u884c<code>UnitTest<\/code>\u4ece\u7ec4\u4ef6JavaScript\u63a7\u5236\u5668\u5bfc\u5165\u8be5\u7c7b\u3002<\/li>\n<li>\u7b2c4\u884c\u5f00\u59cb<code>describe<\/code>\u6d4b\u8bd5\u5957\u4ef6\u5757\u3002<\/li>\n<li>\u7b2c5\u884c\u662fJest\u6e05\u7406\u65b9\u6cd5\u3002<code>afterEach()<\/code>\u662fJest\u7684\u8bbe\u7f6e\u548c\u6e05\u9664\u65b9\u6cd5\u4e4b\u4e00\u3002<code>afterEach()<\/code>\u5728\u63cf\u8ff0\u5757\u4e2d\u7684\u6bcf\u4e2a\u6d4b\u8bd5\u4e4b\u540e\u8fd0\u884c\u3002\u6b64<code>afterEach()<\/code>\u65b9\u6cd5\u5728\u6d4b\u8bd5\u7ed3\u675f\u65f6\u91cd\u7f6eDOM\u3002\u6d4b\u8bd5\u8fd0\u884c\u65f6\uff0cJest\u6ca1\u6709\u8fd0\u884c\u6d4f\u89c8\u5668\u3002Jest\u4f7f\u7528jsdom\u6765\u63d0\u4f9b\u884c\u4e3a\u7c7b\u4f3c\u4e8e\u6d4f\u89c8\u5668\u7684DOM\u6216\u6587\u6863\u7684\u73af\u5883\u3002\u6bcf\u4e2a\u6d4b\u8bd5\u6587\u4ef6\u90fd\u6709\u4e00\u4e2ajsdom\u5b9e\u4f8b\uff0c\u5e76\u4e14\u4e0d\u4f1a\u5728\u6587\u4ef6\u5185\u90e8\u7684\u6d4b\u8bd5\u4e4b\u95f4\u91cd\u7f6e\u66f4\u6539\u3002\u6700\u4f73\u5b9e\u8df5\u662f\u5728\u6d4b\u8bd5\u4e4b\u95f4\u8fdb\u884c\u6e05\u7406\uff0c\u4ee5\u4f7f\u6d4b\u8bd5\u7684\u8f93\u51fa\u4e0d\u4f1a\u5f71\u54cd\u4efb\u4f55\u5176\u4ed6\u6d4b\u8bd5\u3002\u8fd8\u6709\u5176\u4ed6\u53ef\u7528\u7684\u8bbe\u7f6e\u548c\u6e05\u9664\u65b9\u6cd5\u3002\u68c0\u67e5\u8d44\u6e90\u3002<\/li>\n<li>\u7b2c12\u884c\u542f\u52a8<code>it<\/code>\u6d4b\u8bd5\u5757\u3002<\/li>\n<li>\u7b2c13\u884c\u662f\u60a8\u4f7f\u7528\u5bfc\u5165<code>createElement<\/code>\u65b9\u6cd5\u7684\u4f4d\u7f6e\u3002\u5b83\u521b\u5efa\u7ec4\u4ef6\u7684\u5b9e\u4f8b\u5e76\u5c06\u5176\u5206\u914d\u7ed9\u5e38\u91cf<code>element<\/code>\u3002<\/li>\n<li>\u7b2c16<code>expect<\/code>\u884c\u5c06\u65ad\u8a00<code>unitNumber<\/code>\u53d8\u91cf\u8bbe\u7f6e\u4e3a5\u3002\u8fd9\u662f\u6211\u4eec\u8981\u6d4b\u8bd5\u7684\u7b2c\u4e00\u4e2a\u8981\u6c42\uff0c\u9996\u5148<code>unitNumber<\/code>\u8bbe\u7f6e\u4e3a5\u3002<\/li>\n<li>\u7b2c18\u884c\u5b9e\u9645\u4e0a\u4f7f\u7528\u5c06\u8be5<code>element<\/code>\u4ee3\u7801\u6dfb\u52a0\u5230jsdom\u7684\u7248\u672c\u4e2d\u3002\u8be5\u8c03\u7528\u5c06Lightning Web\u7ec4\u4ef6\u9644\u52a0\u5230DOM\u5e76\u8fdb\u884c\u6e32\u67d3\uff0c\u8fd9\u4e5f\u610f\u5473\u7740\u5c06\u8c03\u7528\u751f\u547d\u5468\u671f\u6302\u94a9connectedCallback\uff08\uff09\u548crenderedCallback\uff08\uff09\uff08\u7a0d\u540e\u4f1a\u5bf9\u6b64\u8fdb\u884c\u66f4\u591a\u4ecb\u7ecd\uff09\u3002<code>document.body<\/code><code>appendChild<\/code><\/li>\n<li>\u7b2c20\u884c\u4f7f\u7528<code>querySelector<\/code>\uff08\u6807\u51c6DOM\u67e5\u8be2\u65b9\u6cd5\uff09\u5728DOM\u4e2d\u641c\u7d22<code>div<\/code>\u6807\u7b7e\u3002\u4f7f\u7528<code>element.shadowRoot<\/code>\u4f5c\u4e3a\u7236\u7684\u67e5\u8be2\u3002\u8fd9\u662f\u4e00\u4e2a\u4ec5\u6d4b\u8bd5\u7684API\uff0c\u53ef\u8ba9\u60a8\u7aa5\u89c6\u9634\u5f71\u8fb9\u754c\u4ee5\u68c0\u67e5\u7ec4\u4ef6\u7684\u9634\u5f71\u6811\u3002<\/li>\n<li>\u6700\u540e\uff0c\u7b2c21\u884c\u6709<code>expect<\/code>\u770b<code>textContent<\/code>\u7684\u7684<code>div<\/code>\u6807\u7b7e\u6765\u65ad\u8a00\u201c\u5355\u51435\u8fd8\u6d3b\u7740\uff01\u201d\u00a0\u5728\u90a3\u513f\u3002\u8fd9\u662f\u6700\u7ec8\u8981\u6c42\u3002\u58f0\u660e\u6587\u672c\u6b63\u786e\u3002<\/li>\n<\/ul>\n<p>\u8981\u4f7f\u6d4b\u8bd5\u901a\u8fc7\uff0c\u60a8\u9700\u8981\u5411unitTest HTML\u548cJavaScript\u6587\u4ef6\u4e2d\u6dfb\u52a0\u4ee3\u7801\u3002\u6211\u4eec\u5c06\u6dfb\u52a0\u4ee3\u7801\u4ee5\u6ee1\u8db3\u8981\u6c42\u3002<\/p>\n<ol>\n<li>\u5355\u51fb\u8be5<code>unitTest.html<\/code>\u6587\u4ef6\u5c06\u5176\u6253\u5f00\u3002<\/li>\n<li>\u8986\u76d6<code>unitTest.html<\/code>\u4e3a\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>template<span class=\"token punctuation\">&gt;<\/span><\/span>\n  <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>card title<span class=\"token operator\">=<\/span><span class=\"token string\">\"Unit Status\"<\/span> icon<span class=\"token operator\">-<\/span>name<span class=\"token operator\">=<\/span><span class=\"token string\">\"standard:bot\"<\/span><span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span>div <span class=\"token keyword\">class<\/span><span class=\"token operator\">=<\/span><span class=\"token string\">\"slds-m-around_medium\"<\/span><span class=\"token operator\">&gt;<\/span>\n      <span class=\"token class-name\">Unit<\/span> <span class=\"token punctuation\">{<\/span>unitNumber<span class=\"token punctuation\">}<\/span> alive<span class=\"token operator\">!<\/span>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>card<span class=\"token operator\">&gt;<\/span>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>template<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4fdd\u5b58\u6587\u4ef6\u3002<\/li>\n<li>\u5355\u51fb\u8be5<code>unitTest.js<\/code>\u6587\u4ef6\u5c06\u5176\u6253\u5f00\u5e76\u7528\u4ee5\u4e0b\u547d\u4ee4\u8986\u76d6\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span><span class=\"token punctuation\">,<\/span> api <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> sum <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'.\/sum'<\/span><span class=\"token punctuation\">;<\/span>\n  \nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UnitTest<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token annotation punctuation\">@api<\/span> unitNumber <span class=\"token operator\">=<\/span> <span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4fdd\u5b58\u6587\u4ef6\u5e76\u8fd0\u884c\u6d4b\u8bd5\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">npm run test<span class=\"token operator\">:<\/span>unit<\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u6240\u6709\u6d4b\u8bd5\u901a\u8fc7\u3002<\/li>\n<\/ol>\n<h2 id=\"test-asynchronous-dom-updates\">\u6d4b\u8bd5\u5f02\u6b65DOM\u66f4\u65b0<\/h2>\n<p>\u5f53Lightning Web\u7ec4\u4ef6\u7684\u72b6\u6001\u66f4\u6539\u65f6\uff0cDOM\u5f02\u6b65\u66f4\u65b0\u3002\u4e3a\u786e\u4fdd\u60a8\u7684\u6d4b\u8bd5\u5728\u8bc4\u4f30\u7ed3\u679c\u4e4b\u524d\u7b49\u5f85\u66f4\u65b0\u5b8c\u6210\uff0c\u8bf7\u8fd4\u56de\u5df2\u89e3\u51b3\u7684Promise\u3002\u4e3a\u6b64\uff0c\u8bf7\u5c06\u5176\u4f59\u6d4b\u8bd5\u4ee3\u7801\u94fe\u63a5\u5230\u5df2\u89e3\u51b3\u7684Promise\u3002Jest\u5728\u7ed3\u675f\u6d4b\u8bd5\u4e4b\u524d\u7b49\u5f85Promise\u94fe\u5b8c\u6210\u3002\u5982\u679cPromise\u4ee5\u62d2\u7edd\u72b6\u6001\u7ed3\u675f\uff0c\u5219Jest\u65e0\u6cd5\u901a\u8fc7\u6d4b\u8bd5\u3002<\/p>\n<ol>\n<li>\u6253\u5f00<code>unitTest.test.js<\/code>\u3002<\/li>\n<li>\u5728\u6700\u540e\u4e00\u4e2a\u6d4b\u8bd5\u4e4b\u540e\u6dfb\u52a0\u7b2c\u4e8c\u4e2a\u6d4b\u8bd5\u3002<br \/>\u5728\u6b64\u6d4b\u8bd5\u4e2d\uff0c\u6211\u4eec\u8981\u9a8c\u8bc1\u5c5e\u6027\u66f4\u6539\u5c06\u66f4\u65b0DOM\u4e2d\u7684\u6587\u672c\u3002\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">  <span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'displays unit status with updated unitNumber'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token keyword\">const<\/span> element <span class=\"token operator\">=<\/span> <span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'c-unit-test'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span>\n     is<span class=\"token operator\">:<\/span> <span class=\"token class-name\">UnitTest<\/span>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token comment\">\/\/ Add the element to the jsdom instance<\/span>\n    document<span class=\"token punctuation\">.<\/span>body<span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>element<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token comment\">\/\/ Update unitNumber after element is appended<\/span>\n    element<span class=\"token punctuation\">.<\/span>unitNumber <span class=\"token operator\">=<\/span> <span class=\"token number\">6<\/span>\n    <span class=\"token keyword\">const<\/span> div <span class=\"token operator\">=<\/span> element<span class=\"token punctuation\">.<\/span>shadowRoot<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'div'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token comment\">\/\/ Verify displayed unit status<\/span>\n    <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>div<span class=\"token punctuation\">.<\/span>textContent<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Unit 6 alive!'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4fdd\u5b58\u6587\u4ef6\u5e76\u8fd0\u884c\u6d4b\u8bd5\u3002\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">npm run test<span class=\"token operator\">:<\/span>unit<\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u60a8\u6536\u5230\u4ee5\u4e0b\u5931\u8d25\u6d88\u606f\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token class-name\">Expected<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">\"Unit 6 alive!\"<\/span>\n<span class=\"token class-name\">Received<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">\"Unit 5 alive!\"<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<\/ol>\n<p>\u8fd9\u662f\u600e\u4e48\u56de\u4e8b\uff1f\u8be5<code>expect<\/code>\u58f0\u660e\u65ad\u8a00<code>div.textContext<\/code>\u5e94\u5f53\u4e3a\u201c Unit 6 live\u201d\uff0c\u4f46\u4ecd\u4e3a\u201c Unit 5 live\uff01\u201d\u3002\u4e3a\u4e86\u67e5\u770b\u66f4\u6539\uff0c\u6211\u4eec\u9700\u8981\u901a\u8fc7\u8fd4\u56deresolve\u6765\u7b49\u5f85\u5b83<code>Promise<\/code>\u3002\u00a0<\/p>\n<ol>\n<li><code>expect<\/code>\u5728\u6ce8\u91ca\u4e4b\u540e\uff0c\u5c06\u5931\u8d25\u7684\u8bed\u53e5\u66ff\u6362\u4e3a\u4ee5\u4e0b\u5185\u5bb9<code>\/\/ Verify display unit status<\/code>\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">    <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>div<span class=\"token punctuation\">.<\/span>textContent<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>not<span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Unit 6 alive!'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token comment\">\/\/ Return a promise to wait for any asynchronous DOM updates. Jest<\/span>\n    <span class=\"token comment\">\/\/ will automatically wait for the Promise chain to complete before<\/span>\n    <span class=\"token comment\">\/\/ ending the test and fail the test if the promise rejects.<\/span>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Promise<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n      <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>div<span class=\"token punctuation\">.<\/span>textContent<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Unit 6 alive!'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4f7f\u7528\u4e0e\u4e0a\u6b21\u76f8\u540c\u7684\u547d\u4ee4\u6765\u8fd0\u884c\u6d4b\u8bd5\uff0c\u6216\u8005\u4f7f\u7528\u4e0a\u4e00\u5355\u5143\u7684\u201c\u8fd0\u884cJest\u6d4b\u8bd5\u201d\u90e8\u5206\u4e2d\u7684\u5176\u4ed6\u9009\u9879\u4e4b\u4e00\u3002<\/li>\n<li>\u6d4b\u8bd5\u901a\u8fc7\u3002<\/li>\n<\/ol>\n<p>\u5230\u73b0\u5728\u4e3a\u6b62\u8fd8\u633a\u597d\u3002\u60a8\u5728\u4e24\u4e2a\u6d4b\u8bd5\u5957\u4ef6\u4e2d\u6709\u4e09\u4e2a\u6210\u529f\u7684\u6d4b\u8bd5\u3002\u63a5\u4e0b\u6765\uff0c\u6dfb\u52a0\u7b2c\u56db\u9879\u6d4b\u8bd5\uff0c\u4ee5\u4fbf\u5728\u8f93\u5165\u5b57\u6bb5\u66f4\u65b0\u65f6\u53ef\u4ee5\u9a8c\u8bc1\u5355\u5143\u72b6\u6001\u662f\u5426\u5df2\u66f4\u65b0\u3002\u4e3a\u6b64\uff0c\u8bf7\u5728\u8f93\u5165\u5b57\u6bb5\u4e2d\u4f7f\u7528change\u4e8b\u4ef6\u3002<\/p>\n<ol>\n<li>\u6253\u5f00<code>unitTest.test.js<\/code>\uff0c\u5982\u679c\u5b83\u4e0d\u662f\u5df2\u7ecf\u6253\u5f00\u3002<\/li>\n<li>\u5728\u60a8\u6dfb\u52a0\u7684\u6700\u540e\u4e00\u4e2a\u6d4b\u8bd5\u4e4b\u540e\u6dfb\u52a0\u4e00\u884c\uff0c\u5e76\u5c06\u6b64\u7b2c\u4e09\u4e2a\u6d4b\u8bd5\u6dfb\u52a0\u5230\u5957\u4ef6\u4e2d\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">  <span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'displays unit status with input change event'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token keyword\">const<\/span> element <span class=\"token operator\">=<\/span> <span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'c-unit-test'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span>\n      is<span class=\"token operator\">:<\/span> <span class=\"token class-name\">UnitTest<\/span>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    document<span class=\"token punctuation\">.<\/span>body<span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>element<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token keyword\">const<\/span> div <span class=\"token operator\">=<\/span> element<span class=\"token punctuation\">.<\/span>shadowRoot<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'div'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token comment\">\/\/ Trigger unit status input change<\/span>\n    <span class=\"token keyword\">const<\/span> inputElement <span class=\"token operator\">=<\/span> element<span class=\"token punctuation\">.<\/span>shadowRoot<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'lightning-input'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    inputElement<span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">=<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">;<\/span>\n    inputElement<span class=\"token punctuation\">.<\/span><span class=\"token function\">dispatchEvent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">CustomEvent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'change'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Promise<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n      <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>div<span class=\"token punctuation\">.<\/span>textContent<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Unit 7 alive!'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4fdd\u5b58\u6587\u4ef6\u5e76\u8fd0\u884c\u6d4b\u8bd5\u4ee5\u67e5\u770b\u5931\u8d25\u7684\u6d88\u606f\u3002<br \/><img decoding=\"async\" class=\"image image-block image-center\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/modules\/test-lightning-web-components\/write-a-jest-test\/images\/7530fd7c482e9cad0e21b504c948ed0b_a-429-e-242-ab-54-424-d-941-c-00-d-3-f-91-bb-181.png\" alt=\"\u9519\u8bef\u4fe1\u606f\u3002\" \/>\u60a8\u53ef\u4ee5\u770b\u5230\u53ea\u8fd0\u884c\u4e86\u4e00\u4e2a\u6d4b\u8bd5\uff0c\u800c\u5176\u4ed6\u4e24\u4e2a\u5219\u88ab\u8df3\u8fc7\u3002<\/li>\n<\/ol>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u6b63\u5728\u6d4b\u8bd5\u7684\u5185\u5bb9\uff1a<\/p>\n<ul>\n<li>\u524d\u51e0\u884c\u5e94\u8be5\u5f88\u719f\u6089\u3002\u60a8\u6b63\u5728\u5c06UnitTest\u6dfb\u52a0\u5230\u4e2d<code>document.body<\/code>\uff0c\u7136\u540e\u521b\u5efa\u5bf9\u7684\u5f15\u7528<code>div<\/code>\u3002<\/li>\n<li><code>inputElement<\/code>\u53c2\u7167\u96f7\u7535\u8f93\u5165\u5b57\u6bb5\u6765\u8bbe\u7f6e\u5e38\u6570\u3002<\/li>\n<li>\u63a5\u4e0b\u6765\uff0c\u5c06\u8be5\u8f93\u5165\u5b57\u6bb5\u7684\u503c\u8bbe\u7f6e\u4e3a7\u3002<\/li>\n<li>\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528\u4e8b\u4ef6\u7c7b\u578b\u4e3a\u201c 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operator\">=<\/span><span class=\"token string\">\"Unit Number\"<\/span>\n    value<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>unitNumber<span class=\"token punctuation\">}<\/span>\n    onchange<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>handleChange<span class=\"token punctuation\">}<\/span> <span class=\"token operator\">&gt;<\/span>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>input<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/li>\n<li>\u4fdd\u5b58\u6587\u4ef6\u3002<\/li>\n<li>\u6253\u5f00<code>unitTest.js<\/code>\u3002<\/li>\n<li>\u5728<code>@api unitNumber<\/code>\u8bed\u53e5\u4e4b\u540e\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\uff1a\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code 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