{"id":1231,"date":"2025-03-24T08:52:32","date_gmt":"2025-03-23T23:52:32","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1231"},"modified":"2025-03-24T08:52:32","modified_gmt":"2025-03-23T23:52:32","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91rspec-let%e3%81%ae%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%a85%e3%81%a4%e3%81%ae%e5%ae%9f%e8%b7%b5%e7%9a%84","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1231","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011RSpec let\u306e\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u4f7f\u3044\u65b9\u30685\u3064\u306e\u5b9f\u8df5\u7684\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">RSpec let\u3068\u306f\uff1a\u57fa\u790e\u304b\u3089\u7406\u89e3\u3059\u308b\u91cd\u8981\u6027<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">let\u304c\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306b\u3082\u305f\u3089\u3059\u660e\u78ba\u306a\u4fa1\u5024<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">let\u3068let!\u306e\u6c7a\u5b9a\u7684\u306a\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-6\">let\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-7\">\u30b7\u30f3\u30d7\u30eb\u306a\u5b9a\u7fa9\u304b\u3089\u59cb\u3081\u308blet\u5165\u9580<\/a>      <\/li>      <li>        <a href=\"#i-8\">\u8907\u6570\u306elet\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u5b9f\u8df5\u7684\u306a\u4f8b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-9\">let\u306e\u30b9\u30b3\u30fc\u30d7\u3068\u306f\uff1a\u6b63\u3057\u3044\u7406\u89e3\u3068\u6d3b\u7528\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-10\">\u5b9f\u8df5\u3067\u6d3b\u304d\u308b5\u3064\u306elet\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-11\">Step1: \u547d\u540d\u898f\u5247\u3067\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u308b<\/a>      <\/li>      <li>        <a href=\"#i-12\">Step2: \u4f9d\u5b58\u95a2\u4fc2\u3092\u660e\u78ba\u306b\u3059\u308b\u69cb\u9020\u5316<\/a>      <\/li>      <li>        <a href=\"#i-13\">Step3: \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u4f7f\u7528<\/a>      <\/li>      <li>        <a href=\"#i-14\">Step4: \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">Step5: \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3067\u306e\u52b9\u679c\u7684\u306a\u6d3b\u7528<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">\u3088\u304f\u3042\u308blet\u306e\u843d\u3068\u3057\u7a74\u3068\u89e3\u6c7a\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u3092\u62db\u304f\u5178\u578b\u7684\u306a\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u30c6\u30b9\u30c8\u306e\u53ef\u8aad\u6027\u3092\u640d\u306a\u3046\u5b9f\u88c5\u4f8b\u3068\u6539\u5584\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-19\">\u5b9f\u8df5\u7684\u306alet\u306e\u6d3b\u7528\u30b7\u30fc\u30f3\u3068\u5177\u4f53\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-20\">FactoryBot\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li>        <a href=\"#i-21\">\u5171\u901a\u306e\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u52b9\u7387\u7684\u306b\u6271\u3046\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">\u30e2\u30c3\u30af\u3084\u30b9\u30bf\u30d6\u3068let\u306e\u9023\u643a\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">RSpec let\u3068\u306f\uff1a\u57fa\u790e\u304b\u3089\u7406\u89e3\u3059\u308b\u91cd\u8981\u6027<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">let\u304c\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306b\u3082\u305f\u3089\u3059\u660e\u78ba\u306a\u4fa1\u5024<\/h3>\n\n\n\n<p>RSpec let\u306f\u3001\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u5185\u3067\u518d\u5229\u7528\u53ef\u80fd\u306a\u5024\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u9045\u5ef6\u8a55\u4fa1\u3067\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002let\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3001\u4fdd\u5b88\u6027\u3001\u305d\u3057\u3066\u5b9f\u884c\u52b9\u7387\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e3b\u306a\u4fa1\u5024\u306f\u4ee5\u4e0b\u306e3\u70b9\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u306b\u306a\u3063\u305f\u6642\u70b9\u3067\u521d\u3081\u3066\u8a55\u4fa1\u3055\u308c\u308b\uff08\u9045\u5ef6\u8a55\u4fa1\uff09<\/li>\n\n\n\n<li>\u540c\u3058example\u306e\u4e2d\u3067\u8907\u6570\u56de\u53c2\u7167\u3057\u3066\u3082\u3001\u5024\u304c\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u308b<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u9593\u3067\u306e\u526f\u4f5c\u7528\u3092\u9632\u3050<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u524a\u6e1b<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5171\u901a\u306e\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u4e00\u7b87\u6240\u3067\u5b9a\u7fa9<\/li>\n\n\n\n<li>DRY\uff08Don\u2019t Repeat Yourself\uff09\u306e\u539f\u5247\u306b\u5f93\u3063\u305f\u5b9f\u88c5\u304c\u53ef\u80fd<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u5909\u66f4\u304c\u5bb9\u6613<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c6\u30b9\u30c8\u306e\u69cb\u9020\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c6\u30b9\u30c8\u306e\u524d\u63d0\u6761\u4ef6\u3092\u660e\u78ba\u306b\u8a18\u8ff0<\/li>\n\n\n\n<li>\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3054\u3068\u306b\u7570\u306a\u308b\u5024\u3092\u7c21\u5358\u306b\u5b9a\u7fa9<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u610f\u56f3\u304c\u7406\u89e3\u3057\u3084\u3059\u3044<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">let\u3068let!\u306e\u6c7a\u5b9a\u7684\u306a\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p><code>let<\/code>\u3068<code>let!<\/code>\u306f\u4e00\u898b\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u306e\u5b9f\u884c\u30bf\u30a4\u30df\u30f3\u30b0\u306b\u306f\u91cd\u8981\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-3\">let\u306e\u7279\u5fb4<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe User do\n  let(:user) { User.create(name: 'Alice') }  # \u3053\u306e\u6642\u70b9\u3067\u306f\u5b9f\u884c\u3055\u308c\u306a\u3044\n\n  it 'checks the user name' do\n    expect(user.name).to eq 'Alice'  # \u3053\u306e\u6642\u70b9\u3067\u521d\u3081\u3066\u30e6\u30fc\u30b6\u30fc\u304c\u4f5c\u6210\u3055\u308c\u308b\n  end\nend<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9045\u5ef6\u8a55\u4fa1\uff08lazy evaluation\uff09<\/li>\n\n\n\n<li>\u53c2\u7167\u3055\u308c\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u521d\u3081\u3066\u5b9f\u884c<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u826f\u3044<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u5b9f\u884c\u901f\u5ea6\u304c\u901f\u3044<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-4\">let!\u306e\u7279\u5fb4<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe User do\n  let!(:user) { User.create(name: 'Bob') }  # \u3053\u306e\u6642\u70b9\u3067\u5373\u5ea7\u306b\u5b9f\u884c\u3055\u308c\u308b\n\n  it 'finds the created user' do\n    expect(User.find_by(name: 'Bob')).to eq user  # \u30e6\u30fc\u30b6\u30fc\u306f\u65e2\u306b\u4f5c\u6210\u6e08\u307f\n  end\nend<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5373\u6642\u8a55\u4fa1\uff08eager evaluation\uff09<\/li>\n\n\n\n<li>example\u306e\u5b9f\u884c\u524d\u306b\u5fc5\u305a\u5b9f\u884c\u3055\u308c\u308b<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u6e96\u5099\u306a\u3069\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u4fbf\u5229<\/li>\n\n\n\n<li><code>before<\/code>\u30d6\u30ed\u30c3\u30af\u3068\u540c\u69d8\u306e\u52d5\u4f5c<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">\u4f7f\u3044\u5206\u3051\u306e\u57fa\u6e96<\/h4>\n\n\n<div id=\"id-99fd17d7-0d40-4e8c-8731-ee1cabc7287a\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u4f7f\u7528\u30b1\u30fc\u30b9<\/th><th>\u63a8\u5968\u3055\u308c\u308b\u65b9<\/th><th>\u7406\u7531<\/th><\/tr><\/thead><tbody><tr><td>\u5358\u7d14\u306a\u5024\u306e\u5b9a\u7fa9<\/td><td><code>let<\/code><\/td><td>\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u826f\u304f\u3001\u5fc5\u8981\u6642\u306e\u307f\u8a55\u4fa1\u3055\u308c\u308b<\/td><\/tr><tr><td>DB\u30ec\u30b3\u30fc\u30c9\u306e\u53c2\u7167\u306e\u307f<\/td><td><code>let<\/code><\/td><td>\u5b9f\u969b\u306b\u5fc5\u8981\u306b\u306a\u308b\u307e\u3067DB\u30a2\u30af\u30bb\u30b9\u3092\u9045\u5ef6\u3067\u304d\u308b<\/td><\/tr><tr><td>\u4ed6\u306e\u30c6\u30b9\u30c8\u306e\u524d\u63d0\u6761\u4ef6<\/td><td><code>let!<\/code><\/td><td>\u30c6\u30b9\u30c8\u5b9f\u884c\u524d\u306b\u30c7\u30fc\u30bf\u3092\u78ba\u5b9f\u306b\u7528\u610f\u3067\u304d\u308b<\/td><\/tr><tr><td>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u30c6\u30b9\u30c8<\/td><td><code>let!<\/code><\/td><td>\u30e2\u30c7\u30eb\u306e\u4f5c\u6210\u6642\u306e\u6319\u52d5\u3092\u78ba\u5b9f\u306b\u30c6\u30b9\u30c8\u3067\u304d\u308b<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001let\u3068let!\u306f\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u6982\u5ff5\u3092\u8e0f\u307e\u3048\u305f\u4e0a\u3067\u3001\u5177\u4f53\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">let\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u30b7\u30f3\u30d7\u30eb\u306a\u5b9a\u7fa9\u304b\u3089\u59cb\u3081\u308blet\u5165\u9580<\/h3>\n\n\n\n<p>let\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u5f62\u5f0f\u3067\u5b9a\u7fa9\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">let(:\u5909\u6570\u540d) { \u5024\u3084\u51e6\u7406 }<\/pre>\n\n\n\n<p>\u5177\u4f53\u7684\u306a\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe Calculator do\n  # \u5358\u7d14\u306a\u5024\u306e\u5b9a\u7fa9\n  let(:number) { 42 }\n\n  # \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\n  let(:calculator) { Calculator.new }\n\n  # \u8a08\u7b97\u7d50\u679c\u306e\u5b9a\u7fa9\n  let(:result) { calculator.add(number, 10) }\n\n  it 'performs addition correctly' do\n    expect(result).to eq 52\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u8907\u6570\u306elet\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u5b9f\u8df5\u7684\u306a\u4f8b<\/h3>\n\n\n\n<p>\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u8907\u6570\u306elet\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u6ce8\u6587\u51e6\u7406\u3092\u30c6\u30b9\u30c8\u3059\u308b\u4f8b\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe Order do\n  # \u57fa\u672c\u7684\u306a\u30e6\u30fc\u30b6\u30fc\u60c5\u5831\n  let(:user) { User.create(name: 'Alice', email: 'alice@example.com') }\n\n  # \u30e6\u30fc\u30b6\u30fc\u306e\u4f4f\u6240\u60c5\u5831\n  let(:address) { \n    Address.create(\n      user: user,\n      street: '123 Ruby Street',\n      city: 'Rails City'\n    )\n  }\n\n  # \u6ce8\u6587\u3059\u308b\u5546\u54c1\n  let(:product) { Product.create(name: 'Ruby Book', price: 2500) }\n\n  # \u6ce8\u6587\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\n  let(:order) {\n    Order.create(\n      user: user,\n      shipping_address: address,\n      items: [OrderItem.new(product: product, quantity: 2)]\n    )\n  }\n\n  describe '#total_amount' do\n    it 'calculates the correct total' do\n      expect(order.total_amount).to eq 5000  # 2500\u5186 \u00d7 2\u500b\n    end\n  end\n\n  describe '#shipping_label' do\n    it 'includes user name and address' do\n      expect(order.shipping_label).to include('Alice')\n      expect(order.shipping_label).to include('123 Ruby Street')\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">let\u306e\u30b9\u30b3\u30fc\u30d7\u3068\u306f\uff1a\u6b63\u3057\u3044\u7406\u89e3\u3068\u6d3b\u7528\u6cd5<\/h3>\n\n\n\n<p>let\u306e\u30b9\u30b3\u30fc\u30d7\u306f\u3001\u5b9a\u7fa9\u3055\u308c\u305f\u5834\u6240\u304b\u3089\u5f71\u97ff\u3092\u53d7\u3051\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5916\u5074\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u306e\u5b9a\u7fa9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe User do\n  let(:admin_role) { Role.create(name: 'admin') }\n\n  context 'when user is an admin' do\n    let(:user) { User.create(role: admin_role) }\n\n    it 'has admin privileges' do\n      expect(user.admin?).to be true\n    end\n  end\n\n  context 'when user is not an admin' do\n    let(:user) { User.create(role: nil) }\n\n    it 'does not have admin privileges' do\n      expect(user.admin?).to be false\n    end\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30b9\u30b3\u30fc\u30d7\u306e\u4e0a\u66f8\u304d<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe Product do\n  let(:price) { 1000 }\n\n  context 'with discount' do\n    let(:price) { 800 }  # \u5916\u5074\u306eprice\u3092\u4e0a\u66f8\u304d\n\n    it 'applies the discount' do\n      expect(price).to eq 800\n    end\n  end\n\n  context 'without discount' do\n    it 'uses the regular price' do\n      expect(price).to eq 1000\n    end\n  end\nend<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30b9\u30b3\u30fc\u30d7\u306e\u5171\u6709<\/strong><\/li>\n<\/ol>\n\n\n<div id=\"id-7d334f79-70ce-48ec-8b9c-fdd2d71e28d5\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30b9\u30b3\u30fc\u30d7\u30ec\u30d9\u30eb<\/th><th>\u5229\u7528\u53ef\u80fd\u306a\u7bc4\u56f2<\/th><th>\u4f7f\u7528\u4f8b<\/th><\/tr><\/thead><tbody><tr><td>describe<\/td><td>\u540c\u3058describe\u5185\u306e\u5168\u3066\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3068\u30c6\u30b9\u30c8<\/td><td>\u57fa\u672c\u7684\u306a\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7<\/td><\/tr><tr><td>context<\/td><td>\u540c\u3058context\u5185\u306e\u5168\u3066\u306e\u30c6\u30b9\u30c8<\/td><td>\u7279\u5b9a\u306e\u6761\u4ef6\u4e0b\u3067\u306e\u30c6\u30b9\u30c8<\/td><\/tr><tr><td>it<\/td><td>\u500b\u5225\u306e\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u5185<\/td><td>\u30c6\u30b9\u30c8\u56fa\u6709\u306e\u30c7\u30fc\u30bf<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>let\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30b9\u30b3\u30fc\u30d7\u3067\u306e\u5b9a\u7fa9<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5171\u901a\u3067\u4f7f\u7528\u3059\u308b\u5024\u306f\u4e0a\u4f4d\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u5b9a\u7fa9<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u56fa\u6709\u306e\u5024\u306f\u4e0b\u4f4d\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u5b9a\u7fa9<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u660e\u78ba\u306a\u540d\u524d\u4ed8\u3051<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5909\u6570\u306e\u7528\u9014\u304c\u5206\u304b\u308b\u540d\u524d\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u540d\u524d\u3092\u9078\u629e<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4f9d\u5b58\u95a2\u4fc2\u306e\u7ba1\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f9d\u5b58\u95a2\u4fc2\u304c\u8907\u96d1\u306a\u5834\u5408\u306f\u5206\u5272\u3092\u691c\u8a0e<\/li>\n\n\n\n<li>\u5faa\u74b0\u53c2\u7167\u3092\u907f\u3051\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001let\u306e\u30b9\u30b3\u30fc\u30d7\u3092\u7406\u89e3\u3057\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u69cb\u9020\u5316\u3055\u308c\u305f\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-10\">\u5b9f\u8df5\u3067\u6d3b\u304d\u308b5\u3064\u306elet\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">Step1: \u547d\u540d\u898f\u5247\u3067\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u308b<\/h3>\n\n\n\n<p>\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u306f\u3001\u9069\u5207\u306a\u547d\u540d\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u539f\u5247\u306b\u5f93\u3063\u3066\u547d\u540d\u3092\u884c\u3044\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe User do\n  # \u826f\u3044\u4f8b\uff1a\u76ee\u7684\u304c\u660e\u78ba\u306a\u547d\u540d\n  let(:active_user) { User.create(status: 'active') }\n  let(:admin_user) { User.create(role: 'admin') }\n\n  # \u907f\u3051\u308b\u3079\u304d\u4f8b\uff1a\u610f\u56f3\u304c\u4e0d\u660e\u78ba\u306a\u547d\u540d\n  let(:u1) { User.create(status: 'active') }\n  let(:u2) { User.create(role: 'admin') }\n\n  context 'with premium subscription' do\n    # \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u53cd\u6620\u3057\u305f\u547d\u540d\n    let(:premium_price) { calculate_premium_price }\n    let(:premium_features) { fetch_premium_features }\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">Step2: \u4f9d\u5b58\u95a2\u4fc2\u3092\u660e\u78ba\u306b\u3059\u308b\u69cb\u9020\u5316<\/h3>\n\n\n\n<p>\u8907\u96d1\u306a\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3067\u306f\u3001let\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u660e\u78ba\u306b\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe Order do\n  # \u57fa\u672c\u3068\u306a\u308b\u30e6\u30fc\u30b6\u30fc\u60c5\u5831\n  let(:user) { create(:user, name: 'Alice') }\n\n  # user\u306b\u4f9d\u5b58\u3059\u308b\u4f4f\u6240\u60c5\u5831\n  let(:shipping_address) { \n    create(:address, user: user, primary: true)\n  }\n\n  # \u4e0a\u8a18\u4e8c\u3064\u306b\u4f9d\u5b58\u3059\u308b\u6ce8\u6587\u60c5\u5831\n  let(:order) {\n    create(:order, \n      user: user,\n      shipping_address: shipping_address\n    )\n  }\n\n  # \u4f9d\u5b58\u95a2\u4fc2\u56f3\u3092\u30b3\u30e1\u30f3\u30c8\u3067\u660e\u793a\n  # order\n  #   \u251c\u2500\u2500 user\n  #   \u2514\u2500\u2500 shipping_address\n  #         \u2514\u2500\u2500 user\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">Step3: \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u4f7f\u7528<\/h3>\n\n\n\n<p>\u30c6\u30b9\u30c8\u306e\u5b9f\u884c\u901f\u5ea6\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe Product do\n  # \u826f\u3044\u4f8b\uff1a\u5fc5\u8981\u306a\u6642\u3060\u3051DB\u30a2\u30af\u30bb\u30b9\n  let(:product) { build(:product) }  # DB\u306b\u4fdd\u5b58\u3057\u306a\u3044\n  let(:product_attributes) { { name: 'Ruby Book', price: 2500 } }\n\n  # \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u8a08\u7b97\u7d50\u679c\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\n  let(:calculated_price) do\n    @cached_result ||= begin\n      base_price = product.price\n      tax = calculate_tax(base_price)\n      shipping = calculate_shipping(product.weight)\n      base_price + tax + shipping\n    end\n  end\n\n  context 'when saving is needed' do\n    # DB\u4fdd\u5b58\u304c\u5fc5\u8981\u306a\u5834\u5408\u306e\u307fcreate\u3092\u4f7f\u7528\n    let!(:saved_product) { create(:product) }\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">Step4: \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p>\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u6700\u9069\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u9078\u629e\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe PaymentProcessor do\n  # \u5171\u901a\u306e\u524d\u63d0\u6761\u4ef6\n  let(:user) { create(:user) }\n\n  context 'with valid credit card' do\n    # \u3053\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u7279\u6709\u306e\u6761\u4ef6\n    let(:credit_card) { build(:credit_card, :valid) }\n    let(:payment_method) { :credit_card }\n\n    it 'processes payment successfully' do\n      expect(process_payment).to be_successful\n    end\n  end\n\n  context 'with expired credit card' do\n    # \u5225\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u6761\u4ef6\n    let(:credit_card) { build(:credit_card, :expired) }\n    let(:payment_method) { :credit_card }\n\n    it 'fails to process payment' do\n      expect(process_payment).to be_failed\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">Step5: \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3067\u306e\u52b9\u679c\u7684\u306a\u6d3b\u7528<\/h3>\n\n\n\n<p>\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3092\u7d99\u7d9a\u7684\u306b\u6539\u5584\u3059\u308b\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5171\u901a\u306e\u524d\u63d0\u6761\u4ef6\u306e\u62bd\u51fa<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe UserAuthentication do\n  # \u5171\u901a\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3092\u5171\u6709\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u62bd\u51fa\n  shared_context 'with valid credentials' do\n    let(:email) { 'user@example.com' }\n    let(:password) { 'secure_password' }\n    let(:user) { create(:user, email: email, password: password) }\n  end\n\n  describe '#login' do\n    include_context 'with valid credentials'\n\n    it 'authenticates successfully' do\n      expect(login(email, password)).to be_successful\n    end\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u6574\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe Cart do\n  # \u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u3092\u30b0\u30eb\u30fc\u30d7\u5316\n  let(:cart_items) do\n    {\n      product1: create(:product, price: 1000),\n      product2: create(:product, price: 2000),\n      product3: create(:product, price: 1500)\n    }\n  end\n\n  # \u8a08\u7b97\u30ed\u30b8\u30c3\u30af\u3092\u5206\u96e2\n  let(:total_price) do\n    cart_items.values.sum(&amp;:price)\n  end\nend<\/pre>\n\n\n<div id=\"id-c10ea189-782d-407d-9e30-05a83889f963\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u4f7f\u7528\u30bf\u30a4\u30df\u30f3\u30b0<\/th><\/tr><\/thead><tbody><tr><td>\u660e\u78ba\u306a\u547d\u540d<\/td><td>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u7406\u89e3\u3057\u3084\u3059\u3044<\/td><td>\u5e38\u306b<\/td><\/tr><tr><td>\u4f9d\u5b58\u95a2\u4fc2\u306e\u660e\u793a<\/td><td>\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u5bb9\u6613\u306b\u306a\u308b<\/td><td>\u8907\u6570\u306elet\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u6642<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/td><td>\u30c6\u30b9\u30c8\u5b9f\u884c\u304c\u9ad8\u901f\u306b\u306a\u308b<\/td><td>DB\u30a2\u30af\u30bb\u30b9\u304c\u591a\u3044\u6642<\/td><\/tr><tr><td>\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051<\/td><td>\u30c6\u30b9\u30c8\u304c\u6574\u7406\u3055\u308c\u308b<\/td><td>\u8907\u6570\u306e\u6761\u4ef6\u3092\u30c6\u30b9\u30c8\u3059\u308b\u6642<\/td><\/tr><tr><td>\u52b9\u679c\u7684\u306a\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0<\/td><td>\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u304c\u6e1b\u5c11\u3059\u308b<\/td><td>\u30b3\u30fc\u30c9\u306e\u8907\u96d1\u6027\u304c\u5897\u3057\u305f\u6642<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u4fdd\u5b88\u6027\u304c\u9ad8\u304f\u3001\u52b9\u7387\u7684\u306a\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">\u3088\u304f\u3042\u308blet\u306e\u843d\u3068\u3057\u7a74\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u3092\u62db\u304f\u5178\u578b\u7684\u306a\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>RSpec let\u306e\u4f7f\u7528\u6642\u306b\u3088\u304f\u906d\u9047\u3059\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u554f\u984c\u3068\u305d\u306e\u89e3\u6c7a\u7b56\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e0d\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30af\u30bb\u30b9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\nRSpec.describe User do\n  # \u3059\u3079\u3066\u306e\u30c6\u30b9\u30c8\u3067DB\u30a2\u30af\u30bb\u30b9\u304c\u767a\u751f\n  let(:user) { User.create(name: 'Alice') }\n\n  it 'validates name presence' do\n    user.name = nil\n    # \u3053\u306e\u30c6\u30b9\u30c8\u3067\u306fDB\u4fdd\u5b58\u306f\u4e0d\u8981\n    expect(user).not_to be_valid\n  end\nend\n\n# \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\nRSpec.describe User do\n  # DB\u30a2\u30af\u30bb\u30b9\u3092\u907f\u3051\u3066\u5358\u7d14\u306a\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\n  let(:user) { User.new(name: 'Alice') }\n\n  context 'when database persistence is needed' do\n    # DB\u4fdd\u5b58\u304c\u5fc5\u8981\u306a\u5834\u5408\u306e\u307fcreate\u3092\u4f7f\u7528\n    let!(:persisted_user) { User.create(name: 'Alice') }\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u91cd\u3044\u51e6\u7406\u306e\u4e0d\u9069\u5207\u306a\u914d\u7f6e<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\nRSpec.describe Calculator do\n  # \u6bce\u56de\u91cd\u3044\u8a08\u7b97\u304c\u5b9f\u884c\u3055\u308c\u308b\n  let(:result) { \n    complex_calculation_involving_many_records \n  }\n\n  # \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\n  let(:result) do\n    @cached_result ||= complex_calculation_involving_many_records\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30c6\u30b9\u30c8\u306e\u53ef\u8aad\u6027\u3092\u640d\u306a\u3046\u5b9f\u88c5\u4f8b\u3068\u6539\u5584\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u306b\u95a2\u3059\u308b\u4e00\u822c\u7684\u306a\u554f\u984c\u3068\u3001\u305d\u306e\u89e3\u6c7a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8907\u96d1\u306a\u4f9d\u5b58\u95a2\u4fc2<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\uff1a\u4f9d\u5b58\u95a2\u4fc2\u304c\u8907\u96d1\u3067\u8ffd\u8de1\u304c\u56f0\u96e3\nRSpec.describe Order do\n  let(:user) { create(:user) }\n  let(:cart) { create(:cart, user: user) }\n  let(:items) { create_list(:item, 3) }\n  let(:cart_items) { \n    items.map { |item| \n      create(:cart_item, cart: cart, item: item) \n    }\n  }\n  let(:order) { \n    create(:order, user: user, cart_items: cart_items) \n  }\n\n  # \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\uff1a\u30d5\u30a1\u30af\u30c8\u30ea\u3067\u4f9d\u5b58\u95a2\u4fc2\u3092\u6574\u7406\n  let(:order) { \n    create(:order, :with_items, \n      item_count: 3, \n      user: create(:user)\n    ) \n  }\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u4e0d\u660e\u78ba\u306a\u30c6\u30b9\u30c8\u306e\u610f\u56f3<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\uff1a\u30c6\u30b9\u30c8\u306e\u76ee\u7684\u304c\u4e0d\u660e\u78ba\nRSpec.describe Product do\n  let(:p) { create(:product) }\n  let(:v) { 100 }\n\n  it 'works' do\n    expect(p.calculate(v)).to eq 120\n  end\nend\n\n# \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\uff1a\u610f\u56f3\u304c\u660e\u78ba\nRSpec.describe Product do\n  let(:product) { create(:product, base_price: 100) }\n  let(:quantity) { 2 }\n\n  it 'calculates total price including tax' do\n    expect(product.calculate_total_with_tax(quantity))\n      .to eq 220  # (100 * 2) * 1.1\n  end\nend<\/pre>\n\n\n\n<p>\u4e00\u822c\u7684\u306a\u843d\u3068\u3057\u7a74\u3068\u89e3\u6c7a\u7b56\u306e\u5bfe\u5fdc\u8868\uff1a<\/p>\n\n\n<div id=\"id-ae913afc-4335-46f3-8bc7-de5a0b70e6c5\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u554f\u984c<\/th><th>\u75c7\u72b6<\/th><th>\u89e3\u6c7a\u7b56<\/th><\/tr><\/thead><tbody><tr><td>\u4e0d\u8981\u306aDB\u64cd\u4f5c<\/td><td>\u30c6\u30b9\u30c8\u304c\u9045\u3044<\/td><td>build\/new\u3092\u4f7f\u7528\u3057\u3001\u5fc5\u8981\u306a\u6642\u306e\u307fcreate<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u6d88\u8cbb\u904e\u591a<\/td><td>\u30c6\u30b9\u30c8\u5b9f\u884c\u6642\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u591a\u3044<\/td><td>let\u306e\u5024\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u5fc5\u8981\u6700\u5c0f\u9650\u306e\u30c7\u30fc\u30bf\u751f\u6210<\/td><\/tr><tr><td>\u8907\u96d1\u306a\u4f9d\u5b58\u95a2\u4fc2<\/td><td>\u30c6\u30b9\u30c8\u306e\u4fdd\u5b88\u304c\u56f0\u96e3<\/td><td>\u30d5\u30a1\u30af\u30c8\u30ea\u306e\u6d3b\u7528\u3001\u4f9d\u5b58\u95a2\u4fc2\u306e\u5358\u7d14\u5316<\/td><\/tr><tr><td>\u4e0d\u660e\u78ba\u306a\u547d\u540d<\/td><td>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u5206\u304b\u308a\u306b\u304f\u3044<\/td><td>\u76ee\u7684\u3092\u660e\u78ba\u306b\u3057\u305f\u547d\u540d\u3001\u9069\u5207\u306a\u30b3\u30e1\u30f3\u30c8\u8ffd\u52a0<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u843d\u3068\u3057\u7a74\u3092\u907f\u3051\u308b\u305f\u3081\u306e\u5b9f\u8df5\u7684\u306a\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DB\u30a2\u30af\u30bb\u30b9\u306f\u5fc5\u8981\u6700\u5c0f\u9650\u304b<\/li>\n\n\n\n<li>\u91cd\u3044\u51e6\u7406\u306f\u9069\u5207\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u308b\u304b<\/li>\n\n\n\n<li>\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u3092\u751f\u6210\u3057\u3066\u3044\u308b\u304b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u53ef\u8aad\u6027\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5909\u6570\u540d\u306f\u610f\u56f3\u3092\u9069\u5207\u306b\u8868\u73fe\u3057\u3066\u3044\u308b\u304b<\/li>\n\n\n\n<li>\u4f9d\u5b58\u95a2\u4fc2\u306f\u660e\u78ba\u304b<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u76ee\u7684\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u304b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4fdd\u5b88\u6027\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u306f\u907f\u3051\u3089\u308c\u3066\u3044\u308b\u304b<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u69cb\u9020\u306f\u7406\u89e3\u3057\u3084\u3059\u3044\u304b<\/li>\n\n\n\n<li>\u5909\u66f4\u304c\u5bb9\u6613\u306a\u69cb\u9020\u306b\u306a\u3063\u3066\u3044\u308b\u304b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u554f\u984c\u306b\u6ce8\u610f\u3092\u6255\u3044\u3001\u9069\u5207\u306a\u89e3\u6c7a\u7b56\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-19\">\u5b9f\u8df5\u7684\u306alet\u306e\u6d3b\u7528\u30b7\u30fc\u30f3\u3068\u5177\u4f53\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">FactoryBot\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>FactoryBot\u3068let\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u7ba1\u7406\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe Order do\n  # \u57fa\u672c\u7684\u306a\u30d5\u30a1\u30af\u30c8\u30ea\u306e\u5229\u7528\n  let(:user) { create(:user, :premium) }\n\n  # \u30c8\u30ec\u30a4\u30c8\u3092\u6d3b\u7528\u3057\u305f\u67d4\u8edf\u306a\u30c7\u30fc\u30bf\u751f\u6210\n  let(:product) { create(:product, :digital, price: 1000) }\n\n  # \u95a2\u9023\u3092\u6301\u3064\u30c7\u30fc\u30bf\u306e\u751f\u6210\n  let(:order) {\n    create(:order, \n      user: user,\n      line_items: create_list(:line_item, 3, product: product)\n    )\n  }\n\n  # \u8907\u96d1\u306a\u6761\u4ef6\u3092\u6301\u3064\u30c7\u30fc\u30bf\u306e\u751f\u6210\n  let(:completed_order) {\n    create(:order, :completed,\n      user: user,\n      payment_status: 'paid',\n      shipping_status: 'delivered'\n    )\n  }\n\n  describe '#total_amount' do\n    it 'calculates total with quantity' do\n      expect(order.total_amount).to eq 3000 # 1000\u5186 \u00d7 3\u500b\n    end\n  end\n\n  describe '#refundable?' do\n    context 'with completed order' do\n      it 'allows refund within 7 days' do\n        travel_to(6.days.from_now) do\n          expect(completed_order).to be_refundable\n        end\n      end\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u5171\u901a\u306e\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u52b9\u7387\u7684\u306b\u6271\u3046\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u518d\u5229\u7528\u3068\u7ba1\u7406\u3092\u52b9\u7387\u5316\u3059\u308b\u624b\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5171\u901a\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3092 shared_context \u3068\u3057\u3066\u5b9a\u7fa9\nRSpec.shared_context 'with authenticated admin user' do\n  let(:admin_user) { create(:user, :admin) }\n  let(:access_token) { create(:access_token, user: admin_user) }\n\n  before do\n    login_as admin_user\n  end\nend\n\nRSpec.describe AdminDashboard do\n  include_context 'with authenticated admin user'\n\n  # \u8907\u6570\u306e\u30b0\u30eb\u30fc\u30d7\u3067\u5171\u6709\u3067\u304d\u308b\u95a2\u9023\u30c7\u30fc\u30bf\n  let(:recent_orders) { create_list(:order, 5, created_at: 1.day.ago) }\n  let(:old_orders) { create_list(:order, 3, created_at: 1.month.ago) }\n\n  describe '#recent_orders_summary' do\n    it 'shows only recent orders' do\n      summary = AdminDashboard.new(admin_user).recent_orders_summary\n      expect(summary.orders.count).to eq 5\n    end\n  end\nend\n\n# \u5225\u306e\u30c6\u30b9\u30c8\u3067\u3082\u5171\u901a\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u5229\u7528\u53ef\u80fd\nRSpec.describe AdminAPI do\n  include_context 'with authenticated admin user'\n\n  describe 'GET \/api\/admin\/statistics' do\n    it 'returns authorized response' do\n      get '\/api\/admin\/statistics', headers: { 'Authorization': \"Bearer #{access_token.token}\" }\n      expect(response).to have_http_status(:ok)\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">\u30e2\u30c3\u30af\u3084\u30b9\u30bf\u30d6\u3068let\u306e\u9023\u643a\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>\u30e2\u30c3\u30af\u3084\u30b9\u30bf\u30d6\u3068let\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u9ad8\u5ea6\u306a\u30c6\u30b9\u30c8\u624b\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">RSpec.describe PaymentProcessor do\n  # \u5916\u90e8\u30b5\u30fc\u30d3\u30b9\u306e\u30e2\u30c3\u30af\u3092\u6e96\u5099\n  let(:payment_gateway) { instance_double(\"PaymentGateway\") }\n\n  # \u30e2\u30c3\u30af\u306e\u632f\u308b\u821e\u3044\u3092\u5b9a\u7fa9\n  let(:successful_charge) {\n    {\n      status: 'succeeded',\n      transaction_id: 'tx_123',\n      amount: 5000\n    }\n  }\n\n  # \u30c6\u30b9\u30c8\u5bfe\u8c61\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e96\u5099\n  let(:processor) { PaymentProcessor.new(payment_gateway) }\n\n  # \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u6e96\u5099\n  let(:credit_card) {\n    {\n      number: '4242424242424242',\n      exp_month: 12,\n      exp_year: 2024,\n      cvc: '123'\n    }\n  }\n\n  describe '#process_payment' do\n    before do\n      allow(payment_gateway).to receive(:charge)\n        .with(amount: 5000, source: credit_card)\n        .and_return(successful_charge)\n    end\n\n    it 'processes payment through gateway' do\n      result = processor.process_payment(5000, credit_card)\n\n      expect(result).to be_successful\n      expect(result.transaction_id).to eq 'tx_123'\n      expect(payment_gateway).to have_received(:charge)\n    end\n  end\n\n  # \u30a8\u30e9\u30fc\u30b1\u30fc\u30b9\u306e\u30c6\u30b9\u30c8\n  context 'when gateway raises error' do\n    let(:network_error) { PaymentGateway::NetworkError.new(\"Connection failed\") }\n\n    before do\n      allow(payment_gateway).to receive(:charge)\n        .and_raise(network_error)\n    end\n\n    it 'handles error gracefully' do\n      result = processor.process_payment(5000, credit_card)\n\n      expect(result).to be_failed\n      expect(result.error).to eq \"Payment failed: Connection failed\"\n    end\n  end\nend<\/pre>\n\n\n\n<p>\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3\u306e\u6574\u7406\uff1a<\/p>\n\n\n<div id=\"id-6f0680fd-63d5-468f-a72b-4bec194516a2\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u4f7f\u7528\u30b7\u30fc\u30f3<\/th><th>\u63a8\u5968\u30d1\u30bf\u30fc\u30f3<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u69cb\u9020<\/td><td>FactoryBot\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/td><td>\u30c7\u30fc\u30bf\u751f\u6210\u306e\u7c21\u7d20\u5316\u3001\u4fdd\u5b88\u6027\u5411\u4e0a<\/td><\/tr><tr><td>\u5171\u901a\u306e\u30c6\u30b9\u30c8\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8<\/td><td>shared_context\u306e\u6d3b\u7528<\/td><td>\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u524a\u6e1b\u3001\u4e00\u8cab\u6027\u306e\u78ba\u4fdd<\/td><\/tr><tr><td>\u5916\u90e8\u30b5\u30fc\u30d3\u30b9\u306e\u30c6\u30b9\u30c8<\/td><td>\u30e2\u30c3\u30af\/\u30b9\u30bf\u30d6\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/td><td>\u30c6\u30b9\u30c8\u306e\u4fe1\u983c\u6027\u5411\u4e0a\u3001\u5b9f\u884c\u901f\u5ea6\u306e\u6700\u9069\u5316<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u8df5\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3092\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u9069\u5207\u306b\u9078\u629e\u3057\u3001\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u679c\u7684\u306a\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":{"0":"post-1231","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-ruby","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1231"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1231\/revisions"}],"predecessor-version":[{"id":1232,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1231\/revisions\/1232"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}