{"id":34743,"date":"2025-11-21T12:41:02","date_gmt":"2025-11-21T09:41:02","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=34743"},"modified":"2025-11-21T12:41:02","modified_gmt":"2025-11-21T09:41:02","slug":"vue-uygulamalarini-jest-ile-test-etmek-kapsamli-bir-rehber","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/vue-uygulamalarini-jest-ile-test-etmek-kapsamli-bir-rehber\/","title":{"rendered":"Vue Uygulamalar\u0131n\u0131 Jest ile Test Etmek: Kapsaml\u0131 Bir Rehber"},"content":{"rendered":"<p><body><\/p>\n<h2>Vue Uygulamalar\u0131n\u0131 Jest ile Test Etmek: Kapsaml\u0131 Bir Rehber<\/h2>\n<h3>Giri\u015f: Neden Test Etmeliyiz?<\/h3>\n<p>Yaz\u0131l\u0131m geli\u015ftirme s\u00fcre\u00e7lerinde test, kod kalitesini, g\u00fcvenilirli\u011fini ve s\u00fcrd\u00fcr\u00fclebilirli\u011fini sa\u011flaman\u0131n temel ta\u015flar\u0131ndan biridir. \u00d6zellikle dinamik ve etkile\u015fimli kullan\u0131c\u0131 aray\u00fczleri geli\u015ftirdi\u011fimiz Vue.js gibi modern frontend framework&#8217;lerinde testin \u00f6nemi katlanarak artmaktad\u0131r. Testler, kodunuzun beklendi\u011fi gibi \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 do\u011frulamakla kalmaz, ayn\u0131 zamanda gelecekte yap\u0131lacak de\u011fi\u015fikliklerin mevcut i\u015flevselli\u011fi bozmad\u0131\u011f\u0131n\u0131 garanti eden bir g\u00fcvenlik a\u011f\u0131 g\u00f6revi g\u00f6r\u00fcr. Bu, geli\u015ftiricilerin daha g\u00fcvenle kod yazmas\u0131na, yeni \u00f6zellikler eklemesine ve mevcut kodu refactor etmesine olanak tan\u0131r.<\/p>\n<p>Vue.js uygulamalar\u0131 \u00f6zelinde test yapmak, bile\u015fenlerin do\u011fru \u015fekilde render edildi\u011finden, kullan\u0131c\u0131 etkile\u015fimlerine beklenen tepkileri verdi\u011finden ve veri ak\u0131\u015f\u0131n\u0131n tutarl\u0131 oldu\u011fundan emin olmam\u0131z\u0131 sa\u011flar. Karma\u015f\u0131k bile\u015fen a\u011flar\u0131nda veya b\u00fcy\u00fck \u00f6l\u00e7ekli uygulamalarda, manuel testler zaman al\u0131c\u0131, hataya a\u00e7\u0131k ve yetersiz kalabilir. Otomatik testler ise bu s\u00fcreci h\u0131zland\u0131r\u0131r, tutarl\u0131l\u0131k sa\u011flar ve regresyon hatalar\u0131n\u0131n erken a\u015famada tespit edilmesine yard\u0131mc\u0131 olur. Bu makalede, Vue.js uygulamalar\u0131n\u0131z\u0131 test etmek i\u00e7in pop\u00fcler ve g\u00fc\u00e7l\u00fc bir JavaScript test \u00e7at\u0131s\u0131 olan Jest&#8217;i ve Vue.js&#8217;in resmi test yard\u0131mc\u0131 k\u00fct\u00fcphanesi Vue Test Utils&#8217;i nas\u0131l kullanaca\u011f\u0131n\u0131z\u0131 ayr\u0131nt\u0131l\u0131 bir \u015fekilde inceleyece\u011fiz. Jest&#8217;in h\u0131z\u0131, esnekli\u011fi ve zengin \u00f6zellik seti, Vue bile\u015fenlerinizi birim, entegrasyon ve snapshot testleri ile kapsaml\u0131 bir \u015fekilde test etmek i\u00e7in ideal bir se\u00e7imdir.<\/p>\n<h3>Test T\u00fcrleri ve Yakla\u015f\u0131mlar\u0131<\/h3>\n<p>Yaz\u0131l\u0131m testleri, test edilen kapsam ve amaca g\u00f6re farkl\u0131 t\u00fcrlere ayr\u0131l\u0131r. Vue.js uygulamalar\u0131n\u0131 test ederken genellikle birim, entegrasyon ve snapshot testleri \u00f6ne \u00e7\u0131kar. U\u00e7tan Uca (E2E) testler de \u00f6nemli olmakla birlikte, genellikle Cypress veya Playwright gibi farkl\u0131 ara\u00e7larla ger\u00e7ekle\u015ftirilir.<\/p>\n<h4>Birim Testleri (Unit Tests)<\/h4>\n<p>Birim testleri, uygulaman\u0131z\u0131n en k\u00fc\u00e7\u00fck, izole edilebilir par\u00e7alar\u0131n\u0131 (birimlerini) test etmeye odaklan\u0131r. Vue.js ba\u011flam\u0131nda bu birimler genellikle tek bir bile\u015fen, bir yard\u0131mc\u0131 fonksiyon, bir Vuex mod\u00fcl\u00fc veya bir JavaScript s\u0131n\u0131f\u0131 olabilir. Birim testlerinin amac\u0131, her birimin tek ba\u015f\u0131na do\u011fru \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 do\u011frulamakt\u0131r. Di\u011fer birimlerle olan ba\u011f\u0131ml\u0131l\u0131klar genellikle mock&#8217;lan\u0131r (sahte nesnelerle de\u011fi\u015ftirilir) veya stub&#8217;lan\u0131r (basit bir davran\u0131\u015fla taklit edilir), b\u00f6ylece sadece test edilen birimin kendi mant\u0131\u011f\u0131na odaklan\u0131labilir. Bu, hatalar\u0131n kayna\u011f\u0131n\u0131 h\u0131zl\u0131 bir \u015fekilde tespit etmeye ve izole etmeye yard\u0131mc\u0131 olur. Vue bile\u015fenleri i\u00e7in birim testleri, bile\u015fenin props&#8217;lar\u0131 do\u011fru i\u015fleyip i\u015flemedi\u011fini, computed property&#8217;lerin beklenen de\u011ferleri d\u00f6nd\u00fcr\u00fcp d\u00f6nd\u00fcrmedi\u011fini, metodlar\u0131n do\u011fru \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ve olaylar\u0131 (events) d\u00fczg\u00fcn bir \u015fekilde yayd\u0131\u011f\u0131n\u0131 kontrol etmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n<h4>Entegrasyon Testleri (Integration Tests)<\/h4>\n<p>Entegrasyon testleri, birden fazla birimin veya mod\u00fcl\u00fcn bir araya gelerek do\u011fru \u015fekilde etkile\u015fim kurup kurmad\u0131\u011f\u0131n\u0131 kontrol eder. Vue.js uygulamalar\u0131nda bu, bir ebeveyn bile\u015fenin \u00e7ocuk bile\u015fenleriyle veya bir bile\u015fenin Vuex store&#8217;u ya da bir API servisiyle etkile\u015fimini test etmek anlam\u0131na gelebilir. Entegrasyon testleri, birim testlerinden daha geni\u015f bir kapsam\u0131 hedefler ve farkl\u0131 par\u00e7alar\u0131n birle\u015fti\u011finde ortaya \u00e7\u0131kabilecek sorunlar\u0131 yakalamaya \u00e7al\u0131\u015f\u0131r. \u00d6rne\u011fin, bir form bile\u015feninin kullan\u0131c\u0131 giri\u015fini al\u0131p, bir Vuex aksiyonunu tetikleyerek veriyi store&#8217;a g\u00f6ndermesi ve ard\u0131ndan ba\u015fka bir bile\u015fenin bu veriyi g\u00f6r\u00fcnt\u00fclemesi bir entegrasyon testi senaryosu olabilir. Bu testler, sistemin farkl\u0131 katmanlar\u0131 aras\u0131ndaki aray\u00fczlerin ve veri ak\u0131\u015f\u0131n\u0131n d\u00fczg\u00fcn \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 do\u011frulamak i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<h4>Snapshot Testleri (Snapshot Tests)<\/h4>\n<p>Snapshot testleri, Jest&#8217;in sundu\u011fu benzersiz ve g\u00fc\u00e7l\u00fc bir test t\u00fcr\u00fcd\u00fcr. Bu testler, bir bile\u015fenin render edilmi\u015f \u00e7\u0131kt\u0131s\u0131n\u0131n (genellikle HTML yap\u0131s\u0131n\u0131n) veya bir objenin JSON temsilinin bir &#8220;snapshot&#8221;\u0131n\u0131 al\u0131r ve bu snapshot&#8217;\u0131 diskte saklar. Sonraki test \u00e7al\u0131\u015ft\u0131rmalar\u0131nda, ayn\u0131 bile\u015fenin \u00e7\u0131kt\u0131s\u0131 yeniden render edilir ve kaydedilmi\u015f snapshot ile kar\u015f\u0131la\u015ft\u0131r\u0131l\u0131r. E\u011fer iki \u00e7\u0131kt\u0131 aras\u0131nda bir fark varsa, test ba\u015far\u0131s\u0131z olur. Snapshot testleri, \u00f6zellikle kullan\u0131c\u0131 aray\u00fcz\u00fc bile\u015fenlerinin beklenmedik g\u00f6rsel de\u011fi\u015fikliklerini veya yap\u0131sal regresyonlar\u0131n\u0131 tespit etmek i\u00e7in \u00e7ok kullan\u0131\u015fl\u0131d\u0131r. Bir bile\u015fenin HTML yap\u0131s\u0131n\u0131n, CSS s\u0131n\u0131flar\u0131n\u0131n veya i\u00e7indeki metinlerin yanl\u0131\u015fl\u0131kla de\u011fi\u015fip de\u011fi\u015fmedi\u011fini h\u0131zl\u0131ca kontrol etmenizi sa\u011flar. Ancak, snapshot&#8217;lar\u0131n dikkatli y\u00f6netilmesi gerekir, \u00e7\u00fcnk\u00fc kas\u0131tl\u0131 de\u011fi\u015fikliklerde snapshot&#8217;lar\u0131n g\u00fcncellenmesi unutulursa yan\u0131lt\u0131c\u0131 olabilirler.<\/p>\n<h3>Jest ve Vue Test Utils&#8217;e Giri\u015f<\/h3>\n<p>Vue.js uygulamalar\u0131n\u0131 test etmek i\u00e7in iki ana araca ihtiyac\u0131m\u0131z var: Jest ve Vue Test Utils. Bu ikili, Vue bile\u015fenlerini verimli ve etkili bir \u015fekilde test etmek i\u00e7in g\u00fc\u00e7l\u00fc bir kombinasyon sunar.<\/p>\n<h4>Jest Nedir?<\/h4>\n<p>Jest, Facebook taraf\u0131ndan geli\u015ftirilen pop\u00fcler bir JavaScript test \u00e7at\u0131s\u0131d\u0131r. H\u0131zl\u0131, esnek ve \u00f6zelliklerle dolu olmas\u0131yla bilinir. Jest, s\u0131f\u0131r yap\u0131land\u0131rma ile (zero-config) \u00e7al\u0131\u015fabilme yetene\u011fi, kapsaml\u0131 bir test ko\u015fucusu, assertion k\u00fct\u00fcphanesi, mocking yetenekleri ve snapshot test deste\u011fi gibi bir\u00e7ok \u00f6zelli\u011fi b\u00fcnyesinde bar\u0131nd\u0131r\u0131r. React uygulamalar\u0131 i\u00e7in geli\u015ftirilmi\u015f olsa da, Babel ile birlikte kullan\u0131ld\u0131\u011f\u0131nda Vue.js, Angular veya Node.js gibi di\u011fer JavaScript ortamlar\u0131nda da sorunsuz \u00e7al\u0131\u015f\u0131r. Jest&#8217;in temel avantajlar\u0131 \u015funlard\u0131r:<br \/>\n*   <strong>H\u0131zl\u0131 \u00c7al\u0131\u015fma:<\/strong> Testleri paralel olarak \u00e7al\u0131\u015ft\u0131rarak h\u0131zl\u0131 geri bildirim sa\u011flar.<br \/>\n*   <strong>Kapsaml\u0131 Ara\u00e7 Seti:<\/strong> Assertion k\u00fct\u00fcphanesi (<code>expect<\/code>), mocking fonksiyonlar\u0131 (<code>jest.fn()<\/code>, <code>jest.spyOn()<\/code>), test ko\u015fucusu ve kapsam raporlama gibi t\u00fcm ihtiya\u00e7lar\u0131 kar\u015f\u0131lar.<br \/>\n*   <strong>Snapshot Testleri:<\/strong> Kullan\u0131c\u0131 aray\u00fcz\u00fc bile\u015fenlerinin g\u00f6rsel regresyonlar\u0131n\u0131 yakalamak i\u00e7in e\u015fsiz bir yetenek sunar.<br \/>\n*   <strong>\u0130yi Raporlama:<\/strong> Test sonu\u00e7lar\u0131n\u0131 ve kapsam raporlar\u0131n\u0131 anla\u015f\u0131l\u0131r bir \u015fekilde sunar.<br \/>\n*   <strong>Geli\u015ftirici Deneyimi:<\/strong> Otomatik dosya izleme (<code>--watch<\/code>) ve test \u00e7al\u0131\u015ft\u0131rma gibi \u00f6zelliklerle geli\u015ftirici deneyimini iyile\u015ftirir.<\/p>\n<h4>Vue Test Utils Nedir?<\/h4>\n<p>Vue Test Utils, Vue.js bile\u015fenlerini test etmek i\u00e7in resmi yard\u0131mc\u0131 k\u00fct\u00fcphanedir. Jest gibi genel bir test \u00e7at\u0131s\u0131, Vue bile\u015fenlerini do\u011frudan DOM ortam\u0131nda render edip onlarla etkile\u015fim kurma yetene\u011fine sahip de\u011fildir. Vue Test Utils, bu bo\u015flu\u011fu doldurur. Bile\u015fenleri izole bir \u015fekilde render etmeyi, props g\u00f6ndermeyi, olaylar\u0131 tetiklemeyi, slotlar\u0131 kontrol etmeyi, DOM elementlerine eri\u015fmeyi ve bile\u015fenin i\u00e7 state&#8217;ini g\u00f6zlemlemeyi sa\u011flayan bir dizi yard\u0131mc\u0131 fonksiyon ve metot sunar. Vue Test Utils&#8217;in temel faydalar\u0131 \u015funlard\u0131r:<br \/>\n*   <strong>Bile\u015fenleri \u0130zole Etme:<\/strong> <code>mount<\/code> ve <code>shallowMount<\/code> gibi metotlarla bile\u015fenleri ba\u011f\u0131ms\u0131z olarak render etmeyi sa\u011flar.<br \/>\n*   <strong>Etkile\u015fim Sim\u00fclasyonu:<\/strong> Kullan\u0131c\u0131 etkile\u015fimlerini (t\u0131klama, giri\u015f, form g\u00f6nderme vb.) sim\u00fcle etmek i\u00e7in <code>trigger<\/code> gibi metotlar sunar.<br \/>\n*   <strong>DOM Sorgulama:<\/strong> Bile\u015fenin render etti\u011fi DOM yap\u0131s\u0131 i\u00e7inde elementleri bulmak ve \u00fczerlerinde assertion yapmak i\u00e7in <code>find<\/code>, <code>findAll<\/code>, <code>text<\/code>, <code>html<\/code> gibi metotlar sa\u011flar.<br \/>\n*   <strong>Vuex ve Vue Router Entegrasyonu:<\/strong> Bu k\u00fct\u00fcphanelerle entegre \u00e7al\u0131\u015fan bile\u015fenleri test etmek i\u00e7in kolay mocklama mekanizmalar\u0131 sunar.<br \/>\n*   <strong>Basit API:<\/strong> Sezgisel ve kullan\u0131m\u0131 kolay bir API ile Vue bile\u015fen testlerini basitle\u015ftirir.<\/p>\n<h4>Kurulum ve Temel Yap\u0131land\u0131rma<\/h4>\n<p>Vue projenize Jest ve Vue Test Utils&#8217;i eklemek olduk\u00e7a basittir. Genellikle Vue CLI ile bir proje olu\u015ftururken test se\u00e7eneklerini se\u00e7ti\u011finizde bu kurulum otomatik olarak yap\u0131l\u0131r. Ancak manuel kurulum i\u00e7in a\u015fa\u011f\u0131daki ad\u0131mlar\u0131 izleyebilirsiniz:<\/p>\n<p>1.  <strong>Gerekli Paketleri Y\u00fckleme:<\/strong><\/p>\n<pre><code class=\"language-bash\">npm install --save-dev @vue\/test-utils jest babel-jest @babel\/core @babel\/preset-env vue-jest\n    # veya\n    yarn add --dev @vue\/test-utils jest babel-jest @babel\/core @babel\/preset-env vue-jest<\/code><\/pre>\n<p>    *   <code>@vue\/test-utils<\/code>: Vue Test Utils k\u00fct\u00fcphanesi.<br \/>\n    *   <code>jest<\/code>: Jest test \u00e7at\u0131s\u0131.<br \/>\n    *   <code>babel-jest<\/code>, <code>@babel\/core<\/code>, <code>@babel\/preset-env<\/code>: Jest&#8217;in ES mod\u00fcllerini ve Vue tek dosya bile\u015fenlerini anlayabilmesi i\u00e7in Babel entegrasyonu.<br \/>\n    *   <code>vue-jest<\/code>: Vue tek dosya bile\u015fenlerini Jest&#8217;in anlayaca\u011f\u0131 JavaScript&#8217;e d\u00f6n\u00fc\u015ft\u00fcren bir d\u00f6n\u00fc\u015ft\u00fcr\u00fcc\u00fc.<\/p>\n<p>2.  <strong><code>jest.config.js<\/code> Dosyas\u0131 Olu\u015fturma:<\/strong><br \/>\n    Projenizin k\u00f6k dizininde <code>jest.config.js<\/code> ad\u0131nda bir dosya olu\u015fturarak Jest&#8217;i Vue.js ile \u00e7al\u0131\u015facak \u015fekilde yap\u0131land\u0131rman\u0131z gerekir.<\/p>\n<pre><code class=\"language-javascript\">module.exports = {\n      moduleFileExtensions: [\n        'js',\n        'json',\n        'vue'\n      ],\n      transform: {\n        '^.+\\\\.vue$': 'vue-jest',\n        '^.+\\\\.js$': 'babel-jest'\n      },\n      moduleNameMapper: {\n        '^@\/(.*)$': '<rootDir>\/src\/$1'\n      },\n      testMatch: [\n        '<strong>\/tests\/unit\/<\/strong>\/<em>.spec.(js|jsx|ts|tsx)|<\/em><em>\/__tests__\/<\/em>.(js|jsx|ts|tsx)'\n      ],\n      testURL: 'http:\/\/localhost\/',\n      collectCoverage: true,\n      collectCoverageFrom: [\n        'src\/<em><\/em>\/*.{js,vue}',\n        '!src\/main.js',\n        '!src\/router\/index.js',\n        '!src\/store\/index.js',\n        '!src\/plugins\/*.js'\n      ]\n    };<\/code><\/pre>\n<p>    Bu yap\u0131land\u0131rma, <code>.vue<\/code> dosyalar\u0131n\u0131 <code>vue-jest<\/code> ile, <code>.js<\/code> dosyalar\u0131n\u0131 ise <code>babel-jest<\/code> ile d\u00f6n\u00fc\u015ft\u00fcrmesini, <code>@<\/code> alias&#8217;\u0131n\u0131 tan\u0131mas\u0131n\u0131 ve test kapsam\u0131n\u0131 toplamas\u0131n\u0131 sa\u011flar.<\/p>\n<p>3.  <strong><code>babel.config.js<\/code> Dosyas\u0131 Olu\u015fturma (Gerekliyse):<\/strong><br \/>\n    E\u011fer projenizde hen\u00fcz bir Babel yap\u0131land\u0131rmas\u0131 yoksa, Vue CLI&#8217;\u0131n varsay\u0131lan yap\u0131land\u0131rmas\u0131na benzer \u015fekilde bir <code>babel.config.js<\/code> dosyas\u0131 olu\u015fturman\u0131z gerekebilir.<\/p>\n<pre><code class=\"language-javascript\">module.exports = {\n      presets: [\n        ['@babel\/preset-env', { targets: { node: 'current' } }]\n      ]\n    };<\/code><\/pre>\n<p>    Bu, Jest&#8217;in Node.js ortam\u0131nda \u00e7al\u0131\u015f\u0131rken modern JavaScript s\u00f6zdizimini anlayabilmesini sa\u011flar.<\/p>\n<p>Bu kurulum ad\u0131mlar\u0131yla Jest ve Vue Test Utils, Vue.js projenizde test yazmaya haz\u0131r hale gelir.<\/p>\n<h3>Birim Testleri: Vue Bile\u015fenlerini Test Etmek<\/h3>\n<p>Vue bile\u015fenleri, uygulaman\u0131z\u0131n temel yap\u0131 ta\u015flar\u0131d\u0131r ve do\u011fru \u00e7al\u0131\u015ft\u0131klar\u0131ndan emin olmak, uygulaman\u0131n genel sa\u011fl\u0131\u011f\u0131 i\u00e7in kritik \u00f6neme sahiptir. Vue Test Utils, bile\u015fenlerinizi izole bir \u015fekilde test etmek i\u00e7in g\u00fc\u00e7l\u00fc bir API sunar.<\/p>\n<h4>Temel Bile\u015fen Testi<\/h4>\n<p>Bir Vue bile\u015fenini test etmenin en temel yolu, onu render etmek ve \u00e7\u0131kt\u0131s\u0131n\u0131 kontrol etmektir. Vue Test Utils, bile\u015fenleri render etmek i\u00e7in <code>mount<\/code> ve <code>shallowMount<\/code> olmak \u00fczere iki ana metot sunar.<\/p>\n<p>*   <strong><code>mount<\/code>:<\/strong> Bile\u015feni ve t\u00fcm alt bile\u015fenlerini tam olarak render eder. Bu, entegrasyon testleri i\u00e7in daha uygun olabilir, ancak birim testlerinde alt bile\u015fenlerin davran\u0131\u015f\u0131n\u0131 izole etmek istiyorsan\u0131z karma\u015f\u0131kl\u0131\u011f\u0131 art\u0131rabilir.<br \/>\n*   <strong><code>shallowMount<\/code>:<\/strong> Bile\u015feni render eder, ancak alt bile\u015fenlerini &#8220;stub&#8221; (sahte) olarak render eder. Yani, alt bile\u015fenlerin sadece etiket isimleri g\u00f6r\u00fcn\u00fcr, i\u00e7 mant\u0131klar\u0131 \u00e7al\u0131\u015fmaz. Bu, birim testleri i\u00e7in idealdir \u00e7\u00fcnk\u00fc test edilen bile\u015fenin kendi mant\u0131\u011f\u0131na odaklanman\u0131z\u0131 sa\u011flar ve alt bile\u015fenlerden kaynaklanabilecek yan etkileri ortadan kald\u0131r\u0131r.<\/p>\n<p><strong>\u00d6rnek Senaryo:<\/strong> Basit bir <code>Greeting<\/code> bile\u015feni, bir <code>name<\/code> prop&#8217;u al\u0131r ve bir mesaj g\u00f6r\u00fcnt\u00fcler.<\/p>\n<pre><code class=\"language-vue\"><!-- Greeting.vue -->\n<template>\n  <div>\n    \n    <p v-if=\"greetingMessage\">{{ greetingMessage }}<\/p>\n  <\/div>\n<\/template>\n\n<script>\nexport default {\n  props: {\n    name: {\n      type: String,\n      required: true\n    },\n    greetingMessage: {\n      type: String,\n      default: ''\n    }\n  }\n};\n<\/script><\/code><\/pre>\n<pre><code class=\"language-javascript\">\/\/ Greeting.spec.js\nimport { shallowMount } from '@vue\/test-utils';\nimport Greeting from '@\/components\/Greeting.vue';\n\ndescribe('Greeting.vue', () => {\n  it('renders props.name when passed', () => {\n    const name = 'World';\n    const wrapper = shallowMount(Greeting, {\n      propsData: { name }\n    });\n    expect(wrapper.find('h1').text()).toContain(<code>Hello, ${name}!<\/code>);\n  });\n\n  it('renders greetingMessage when provided', () => {\n    const name = 'Alice';\n    const message = 'Welcome to our app!';\n    const wrapper = shallowMount(Greeting, {\n      propsData: { name, greetingMessage: message }\n    });\n    expect(wrapper.find('p').exists()).toBe(true);\n    expect(wrapper.find('p').text()).toBe(message);\n  });\n\n  it('does not render greetingMessage paragraph if not provided', () => {\n    const name = 'Bob';\n    const wrapper = shallowMount(Greeting, {\n      propsData: { name }\n    });\n    expect(wrapper.find('p').exists()).toBe(false);\n  });\n});<\/code><\/pre>\n<p>Bu \u00f6rnekte, <code>shallowMount<\/code> kullanarak <code>Greeting<\/code> bile\u015fenini render ediyor, <code>propsData<\/code> se\u00e7ene\u011fi ile prop&#8217;lar\u0131 g\u00f6nderiyor ve <code>wrapper.find().text()<\/code> ile render edilen metni kontrol ediyoruz.<\/p>\n<h4>Etkinlikleri (Events) Test Etmek<\/h4>\n<p>Bile\u015fenler genellikle kullan\u0131c\u0131 etkile\u015fimlerine yan\u0131t olarak \u00f6zel olaylar (events) yayar (<code>$emit<\/code>). Bu olaylar\u0131n do\u011fru verilerle ve do\u011fru zamanlarda yay\u0131ld\u0131\u011f\u0131n\u0131 test etmek \u00f6nemlidir. Vue Test Utils, olaylar\u0131 tetiklemek i\u00e7in <code>trigger<\/code> metodunu ve yay\u0131lan olaylar\u0131 kontrol etmek i\u00e7in <code>emitted<\/code> metodunu sunar.<\/p>\n<p><strong>\u00d6rnek Senaryo:<\/strong> Bir <code>Button<\/code> bile\u015feni t\u0131kland\u0131\u011f\u0131nda <code>click<\/code> olay\u0131n\u0131 yayar.<\/p>\n<pre><code class=\"language-vue\"><!-- MyButton.vue -->\n<template>\n  <button @click=\"$emit('click', 'button clicked!')\">\n    {{ label }}\n  <\/button>\n<\/template>\n\n<script>\nexport default {\n  props: {\n    label: String\n  }\n};\n<\/script><\/code><\/pre>\n<pre><code class=\"language-javascript\">\/\/ MyButton.spec.js\nimport { shallowMount } from '@vue\/test-utils';\nimport MyButton from '@\/components\/MyButton.vue';\n\ndescribe('MyButton.vue', () => {\n  it('emits a click event when clicked', async () => {\n    const wrapper = shallowMount(MyButton, {\n      propsData: { label: 'Click Me' }\n    });\n\n    await wrapper.find('button').trigger('click');\n\n    expect(wrapper.emitted().click).toBeTruthy();\n    expect(wrapper.emitted().click[0][0]).toBe('button clicked!');\n  });\n});<\/code><\/pre>\n<p>Burada, d\u00fc\u011fmeye t\u0131klamak i\u00e7in <code>trigger('click')<\/code> kullan\u0131yoruz ve ard\u0131ndan <code>wrapper.emitted().click<\/code> ile <code>click<\/code> olay\u0131n\u0131n yay\u0131l\u0131p yay\u0131lmad\u0131\u011f\u0131n\u0131 ve yay\u0131lan veriyi kontrol ediyoruz. <code>await<\/code> ve <code>async<\/code> kullan\u0131m\u0131, DOM g\u00fcncelleme d\u00f6ng\u00fcs\u00fcn\u00fcn bitmesini beklemek i\u00e7in \u00f6nemlidir.<\/p>\n<h4>Slotlar\u0131 Test Etmek<\/h4>\n<p>Vue bile\u015fenleri, esneklik sa\u011flamak i\u00e7in slotlar arac\u0131l\u0131\u011f\u0131yla i\u00e7erik alabilir. Slotlar\u0131n do\u011fru \u015fekilde render edildi\u011fini test etmek, bile\u015fenlerinizi do\u011fru kullan\u0131p kullanmad\u0131\u011f\u0131n\u0131z\u0131 do\u011frular.<\/p>\n<pre><code class=\"language-vue\"><!-- Card.vue -->\n<template>\n  <div class=\"card\">\n    <header v-if=\"$slots.header\">\n      <slot name=\"header\"><\/slot>\n    <\/header>\n    <main>\n      <slot><\/slot> <!-- Default slot -->\n    <\/main>\n    <footer v-if=\"$slots.footer\">\n      <slot name=\"footer\"><\/slot>\n    <\/footer>\n  <\/div>\n<\/template><\/code><\/pre>\n<pre><code class=\"language-javascript\">\/\/ Card.spec.js\nimport { shallowMount } from '@vue\/test-utils';\nimport Card from '@\/components\/Card.vue';\n\ndescribe('Card.vue', () => {\n  it('renders content in the default slot', () => {\n    const wrapper = shallowMount(Card, {\n      slots: {\n        default: '<p>Default slot content<\/p>'\n      }\n    });\n    expect(wrapper.find('main p').text()).toBe('Default slot content');\n  });\n\n  it('renders content in the named header slot', () => {\n    const wrapper = shallowMount(Card, {\n      slots: {\n        header: '<h2>Header Content<\/h2>'\n      }\n    });\n    expect(wrapper.find('header h2').text()).toBe('Header Content');\n  });\n\n  it('renders content in the named footer slot', () => {\n    const wrapper = shallowMount(Card, {\n      slots: {\n        footer: '<span>Footer Content<\/span>'\n      }\n    });\n    expect(wrapper.find('footer span').text()).toBe('Footer Content');\n  });\n\n  it('does not render header or footer if slots are empty', () => {\n    const wrapper = shallowMount(Card);\n    expect(wrapper.find('header').exists()).toBe(false);\n    expect(wrapper.find('footer').exists()).toBe(false);\n  });\n});<\/code><\/pre>\n<p><code>slots<\/code> se\u00e7ene\u011fi, bile\u015fene g\u00f6nderilecek slot i\u00e7eri\u011fini belirtmenizi sa\u011flar.<\/p>\n<h4>Asenkron \u0130\u015flemleri Test Etmek<\/h4>\n<p>Vue bile\u015fenleri genellikle API \u00e7a\u011fr\u0131lar\u0131 veya zamanlay\u0131c\u0131lar gibi asenkron i\u015flemlerle \u00e7al\u0131\u015f\u0131r. Bu t\u00fcr i\u015flemleri test ederken, DOM g\u00fcncellemelerinin tamamlanmas\u0131n\u0131 beklemek \u00f6nemlidir. Vue Test Utils, <code>nextTick<\/code> metodunu ve Jest&#8217;in <code>async\/await<\/code> deste\u011fini kullanarak asenkron testleri kolayla\u015ft\u0131r\u0131r.<\/p>\n<p><strong>\u00d6rnek Senaryo:<\/strong> Bir bile\u015fen, bir butona t\u0131kland\u0131\u011f\u0131nda asenkron bir veri \u00e7ekme i\u015flemi ba\u015flat\u0131r ve sonucu g\u00f6r\u00fcnt\u00fcler.<\/p>\n<pre><code class=\"language-vue\"><!-- DataFetcher.vue -->\n<template>\n  <div>\n    <button @click=\"fetchData\">Fetch Data<\/button>\n    <p v-if=\"data\">{{ data }}<\/p>\n    <p v-if=\"error\" class=\"error\">{{ error }}<\/p>\n  <\/div>\n<\/template>\n\n<script>\nexport default {\n  data() {\n    return {\n      data: null,\n      error: null\n    };\n  },\n  methods: {\n    async fetchData() {\n      try {\n        \/\/ Simulate an API call\n        const response = await new Promise(resolve => setTimeout(() => resolve('Fetched Data!'), 100));\n        this.data = response;\n      } catch (e) {\n        this.error = 'Failed to fetch data.';\n      }\n    }\n  }\n};\n<\/script><\/code><\/pre>\n<pre><code class=\"language-javascript\">\/\/ DataFetcher.spec.js\nimport { shallowMount } from '@vue\/test-utils';\nimport DataFetcher from '@\/components\/DataFetcher.vue';\n\ndescribe('DataFetcher.vue', () => {\n  it('displays fetched data after button click', async () => {\n    const wrapper = shallowMount(DataFetcher);\n\n    \/\/ Mock the fetchData method to control its asynchronous behavior\n    const mockFetchData = jest.spyOn(wrapper.vm, 'fetchData');\n    mockFetchData.mockImplementation(async () => {\n      \/\/ Simulate successful data fetch\n      wrapper.vm.data = 'Mocked Fetched Data!';\n    });\n\n    await wrapper.find('button').trigger('click');\n    \/\/ We don't need nextTick here because we mocked the data directly,\n    \/\/ but if the real async logic was running, nextTick would be crucial.\n    \/\/ await wrapper.vm.$nextTick(); \n\n    expect(wrapper.find('p').text()).toBe('Mocked Fetched Data!');\n    expect(mockFetchData).toHaveBeenCalled();\n  });\n\n  it('displays error message if data fetching fails', async () => {\n    const wrapper = shallowMount(DataFetcher);\n\n    const mockFetchData = jest.spyOn(wrapper.vm, 'fetchData');\n    mockFetchData.mockImplementation(async () => {\n      \/\/ Simulate failed data fetch\n      wrapper.vm.error = 'Mocked Fetch Error!';\n    });\n\n    await wrapper.find('button').trigger('click');\n    \/\/ await wrapper.vm.$nextTick(); \n\n    expect(wrapper.find('p.error').text()).toBe('Mocked Fetch Error!');\n  });\n});<\/code><\/pre>\n<p>Burada <code>jest.spyOn<\/code> ile <code>fetchData<\/code> metodunu mock&#8217;luyoruz ve asenkron operasyonun sonucunu kontrol ediyoruz. Ger\u00e7ek bir API \u00e7a\u011fr\u0131s\u0131 yerine mocklanm\u0131\u015f bir \u00e7a\u011fr\u0131 kullanarak testin h\u0131zl\u0131 ve izole olmas\u0131n\u0131 sa\u011fl\u0131yoruz.<\/p>\n<h4>Vuex ile Entegre Bile\u015fenleri Test Etmek<\/h4>\n<p>Vuex, Vue uygulamalar\u0131 i\u00e7in merkezi durum y\u00f6netimini sa\u011flar. Vuex store&#8217;u ile etkile\u015fim kuran bile\u015fenleri test ederken, store&#8217;u mocklamak genellikle en iyi yakla\u015f\u0131md\u0131r. Bu, bile\u015fenin kendi mant\u0131\u011f\u0131na odaklanman\u0131z\u0131 ve store&#8217;un karma\u015f\u0131kl\u0131\u011f\u0131ndan ka\u00e7\u0131nman\u0131z\u0131 sa\u011flar. Vue Test Utils, <code>createLocalVue<\/code> ve <code>store<\/code> se\u00e7enekleriyle bunu kolayla\u015ft\u0131r\u0131r.<\/p>\n<pre><code class=\"language-vue\"><!-- UserProfile.vue -->\n<template>\n  <div>\n    <h2 v-if=\"isAuthenticated\">Welcome, {{ username }}!<\/h2>\n    <button v-if=\"!isAuthenticated\" @click=\"login\">Login<\/button>\n    <button v-else @click=\"logout\">Logout<\/button>\n  <\/div>\n<\/template>\n\n<script>\nimport { mapGetters, mapActions } from 'vuex';\n\nexport default {\n  computed: {\n    ...mapGetters(['isAuthenticated', 'username'])\n  },\n  methods: {\n    ...mapActions(['login', 'logout'])\n  }\n};\n<\/script><\/code><\/pre>\n<pre><code class=\"language-javascript\">\/\/ UserProfile.spec.js\nimport { shallowMount, createLocalVue } from '@vue\/test-utils';\nimport Vuex from 'vuex';\nimport UserProfile from '@\/components\/UserProfile.vue';\n\nconst localVue = createLocalVue();\nlocalVue.use(Vuex);\n\ndescribe('UserProfile.vue', () => {\n  let actions;\n  let getters;\n  let store;\n\n  beforeEach(() => {\n    getters = {\n      isAuthenticated: () => false,\n      username: () => ''\n    };\n    actions = {\n      login: jest.fn(),\n      logout: jest.fn()\n    };\n    store = new Vuex.Store({\n      getters,\n      actions\n    });\n  });\n\n  it('renders login button when not authenticated', () => {\n    const wrapper = shallowMount(UserProfile, { store, localVue });\n    expect(wrapper.find('button').text()).toBe('Login');\n    expect(wrapper.find('h2').exists()).toBe(false);\n  });\n\n  it('renders welcome message and logout button when authenticated', () => {\n    getters.isAuthenticated = () => true;\n    getters.username = () => 'TestUser';\n    const wrapper = shallowMount(UserProfile, { store, localVue });\n    expect(wrapper.find('h2').text()).toContain('Welcome, TestUser!');\n    expect(wrapper.find('button').text()).toBe('Logout');\n  });\n\n  it('calls login action when login button is clicked', async () => {\n    const wrapper = shallowMount(UserProfile, { store, localVue });\n    await wrapper.find('button').trigger('click');\n    expect(actions.login).toHaveBeenCalled();\n  });\n\n  it('calls logout action when logout button is clicked (authenticated state)', async () => {\n    getters.isAuthenticated = () => true;\n    getters.username = () => 'TestUser';\n    const wrapper = shallowMount(UserProfile, { store, localVue });\n    await wrapper.find('button').trigger('click');\n    expect(actions.logout).toHaveBeenCalled();\n  });\n});<\/code><\/pre>\n<p><code>createLocalVue<\/code> ile Vue&#8217;nun yerel bir kopyas\u0131n\u0131 olu\u015fturup Vuex&#8217;i y\u00fckl\u00fcyoruz. Ard\u0131ndan, test senaryolar\u0131na \u00f6zel getter&#8217;lar ve aksiyonlar i\u00e7eren bir Vuex store&#8217;u olu\u015fturup <code>shallowMount<\/code> se\u00e7ene\u011fi olarak ge\u00e7iriyoruz. <code>jest.fn()<\/code> ile aksiyonlar\u0131 mock&#8217;layarak \u00e7a\u011fr\u0131l\u0131p \u00e7a\u011fr\u0131lmad\u0131klar\u0131n\u0131 kontrol edebiliriz.<\/p>\n<h4>Vue Router ile Entegre Bile\u015fenleri Test Etmek<\/h4>\n<p>Vue Router ile entegre olan bile\u015fenleri test ederken, <code>$route<\/code> ve <code>$router<\/code> objelerini mocklamak gerekir. Bu, bile\u015fenin y\u00f6nlendirme mant\u0131\u011f\u0131n\u0131 izole etmenizi sa\u011flar.<\/p>\n<pre><code class=\"language-vue\"><!-- ProductDetail.vue -->\n<template>\n  <div>\n    \n    <button @click=\"goBack\">Go Back<\/button>\n  <\/div>\n<\/template>\n\n<script>\nexport default {\n  computed: {\n    productId() {\n      return this.$route.params.id;\n    }\n  },\n  methods: {\n    goBack() {\n      this.$router.back();\n    }\n  }\n};\n<\/script><\/code><\/pre>\n<pre><code class=\"language-javascript\">\/\/ ProductDetail.spec.js\nimport { shallowMount, createLocalVue } from '@vue\/test-utils';\nimport VueRouter from 'vue-router';\nimport ProductDetail from '@\/components\/ProductDetail.vue';\n\nconst localVue = createLocalVue();\nlocalVue.use(VueRouter);\n\ndescribe('ProductDetail.vue', () => {\n  let router;\n  let mockRoute;\n\n  beforeEach(() => {\n    \/\/ Mock $route object\n    mockRoute = {\n      params: {\n        id: '123'\n      }\n    };\n    \/\/ Mock $router object\n    router = {\n      back: jest.fn()\n    };\n  });\n\n  it('displays product ID from route params', () => {\n    const wrapper = shallowMount(ProductDetail, {\n      localVue,\n      mocks: {\n        $route: mockRoute\n      }\n    });\n    expect(wrapper.find('h1').text()).toContain('Product: 123');\n  });\n\n  it('calls router.back() when go back button is clicked', async () => {\n    const wrapper = shallowMount(ProductDetail, {\n      localVue,\n      mocks: {\n        $route: mockRoute,\n        $router: router\n      }\n    });\n    await wrapper.find('button').trigger('click');\n    expect(router.back).toHaveBeenCalled();\n  });\n});<\/code><\/pre>\n<p><code>mocks<\/code> se\u00e7ene\u011fi, bile\u015fenin inject etti\u011fi <code>$route<\/code> ve <code>$router<\/code> gibi global nesneleri mocklamak i\u00e7in kullan\u0131l\u0131r. Bu sayede ger\u00e7ek router&#8217;a ihtiya\u00e7 duymadan bile\u015fenin kendi mant\u0131\u011f\u0131n\u0131 test edebiliriz.<\/p>\n<h3>Snapshot Testleri ile G\u00f6rsel Regresyonlar\u0131 Yakalamak<\/h3>\n<p>Snapshot testleri, \u00f6zellikle bile\u015fenlerin g\u00f6rsel yap\u0131s\u0131n\u0131n veya render \u00e7\u0131kt\u0131s\u0131n\u0131n de\u011fi\u015fmedi\u011finden emin olmak istedi\u011finizde \u00e7ok de\u011ferlidir. Bir bile\u015fenin ilk render edilmi\u015f \u00e7\u0131kt\u0131s\u0131n\u0131n bir &#8220;anl\u0131k g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc&#8221; (snapshot) al\u0131r ve bu g\u00f6r\u00fcnt\u00fcy\u00fc diskte saklar. Gelecekteki test \u00e7al\u0131\u015ft\u0131rmalar\u0131nda, bile\u015fen tekrar render edilir ve yeni \u00e7\u0131kt\u0131 mevcut snapshot ile kar\u015f\u0131la\u015ft\u0131r\u0131l\u0131r.<\/p>\n<p><strong>Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/strong><br \/>\n\u0130lk kez bir snapshot testi \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131n\u0131zda, Jest bile\u015fenin render edilmi\u015f HTML&#8217;ini veya veri yap\u0131s\u0131n\u0131 al\u0131r ve <code>__snapshots__<\/code> dizini alt\u0131nda bir <code>.snap<\/code> dosyas\u0131na kaydeder. Sonraki \u00e7al\u0131\u015ft\u0131rmalarda, Jest bile\u015feni tekrar render eder ve yeni \u00e7\u0131kt\u0131y\u0131 kaydedilmi\u015f snapshot ile kar\u015f\u0131la\u015ft\u0131r\u0131r.<br \/>\n*   <strong>E\u015fle\u015firse:<\/strong> Test ba\u015far\u0131l\u0131 olur.<br \/>\n*   <strong>E\u015fle\u015fmezse:<\/strong> Test ba\u015far\u0131s\u0131z olur ve Jest size fark\u0131 g\u00f6sterir. Bu durumda, ya beklenen bir de\u011fi\u015fiklik olmu\u015ftur ve snapshot&#8217;\u0131 g\u00fcncellemeniz gerekir (<code>jest -u<\/code> komutuyla) ya da istenmeyen bir regresyon hatas\u0131 vard\u0131r ve kodunuzu d\u00fczeltmeniz gerekir.<\/p>\n<p><strong>Avantajlar\u0131:<\/strong><br \/>\n*   <strong>H\u0131zl\u0131 Regresyon Tespiti:<\/strong> Kullan\u0131c\u0131 aray\u00fcz\u00fcnde beklenmeyen de\u011fi\u015fiklikleri veya hatalar\u0131 h\u0131zla yakalar.<br \/>\n*   <strong>D\u00fc\u015f\u00fck Bak\u0131m:<\/strong> Bile\u015fenin t\u00fcm \u00e7\u0131kt\u0131s\u0131n\u0131 otomatik olarak kaydetti\u011fi i\u00e7in, her DOM elementini tek tek kontrol etmek zorunda kalmazs\u0131n\u0131z.<br \/>\n*   <strong>G\u00f6rsel G\u00fcvence:<\/strong> \u00d6zellikle stil veya markup de\u011fi\u015fikliklerinin beklenen \u015fekilde oldu\u011funu do\u011frulamak i\u00e7in kullan\u0131\u015fl\u0131d\u0131r.<\/p>\n<p><strong>Dezavantajlar\u0131:<\/strong><br \/>\n*   <strong>Yanl\u0131\u015f Pozitifler:<\/strong> E\u011fer bir snapshot s\u0131k s\u0131k g\u00fcncellenmesi gerekiyorsa (\u00f6rne\u011fin, dinamik zaman damgalar\u0131 veya rastgele ID&#8217;ler i\u00e7eren bile\u015fenler), testler &#8220;g\u00fcr\u00fclt\u00fcl\u00fc&#8221; hale gelebilir ve ger\u00e7ek hatalar\u0131n g\u00f6zden ka\u00e7mas\u0131na neden olabilir. Bu t\u00fcr durumlar i\u00e7in dinamik k\u0131s\u0131mlar\u0131 mocklamak veya e\u015fle\u015ftiricileri (<code>expect.any(String)<\/code>) kullanmak gerekebilir.<br \/>\n*   <strong>K\u00f6t\u00fc Tasar\u0131m\u0131n Gizlenmesi:<\/strong> Bir snapshot&#8217;\u0131 k\u00f6r\u00fc k\u00f6r\u00fcne g\u00fcncellemek, altta yatan bir tasar\u0131m sorununu g\u00f6zden ka\u00e7\u0131rman\u0131za neden olabilir. Snapshot&#8217;lar\u0131 g\u00fcncellerken dikkatli olmak ve de\u011fi\u015fiklikleri g\u00f6zden ge\u00e7irmek \u00f6nemlidir.<\/p>\n<p><strong>\u00d6rnek:<\/strong><\/p>\n<pre><code class=\"language-vue\"><!-- ProductCard.vue -->\n<template>\n  <div class=\"product-card\">\n    <img :src=\"product.image\" :alt=\"product.name\" \/>\n    <h3>{{ product.name }}<\/h3>\n    <p class=\"price\">${{ product.price.toFixed(2) }}<\/p>\n    <button @click=\"$emit('add-to-cart', product.id)\">Add to Cart<\/button>\n  <\/div>\n<\/template>\n\n<script>\nexport default {\n  props: {\n    product: {\n      type: Object,\n      required: true\n    }\n  }\n};\n<\/script><\/code><\/pre>\n<pre><code class=\"language-javascript\">\/\/ ProductCard.spec.js\nimport { shallowMount } from '@vue\/test-utils';\nimport ProductCard from '@\/components\/ProductCard.vue';\n\ndescribe('ProductCard.vue snapshot', () => {\n  const product = {\n    id: 1,\n    name: 'Test Product',\n    image: 'test-image.jpg',\n    price: 99.99\n  };\n\n  it('renders correctly', () => {\n    const wrapper = shallowMount(ProductCard, {\n      propsData: { product }\n    });\n    expect(wrapper.html()).toMatchSnapshot();\n  });\n});<\/code><\/pre>\n<p>Bu test, <code>ProductCard<\/code> bile\u015feninin render edilmi\u015f HTML \u00e7\u0131kt\u0131s\u0131n\u0131n bir snapshot&#8217;\u0131n\u0131 al\u0131r. E\u011fer bile\u015fende bir de\u011fi\u015fiklik yaparsan\u0131z (\u00f6rne\u011fin, bir s\u0131n\u0131f ad\u0131 veya HTML yap\u0131s\u0131 de\u011fi\u015firse), test ba\u015far\u0131s\u0131z olur ve size fark\u0131 g\u00f6sterir. E\u011fer de\u011fi\u015fiklik kas\u0131tl\u0131ysa, <code>jest -u<\/code> komutunu \u00e7al\u0131\u015ft\u0131rarak snapshot&#8217;\u0131 g\u00fcncelleyebilirsiniz.<\/p>\n<h3>Entegrasyon Testleri: Birden Fazla Bile\u015feni Test Etmek<\/h3>\n<p>Birim testleri tek ba\u015f\u0131na yeterli de\u011fildir; bile\u015fenler genellikle di\u011fer bile\u015fenlerle veya servislerle etkile\u015fim halindedir. Entegrasyon testleri, bu etkile\u015fimlerin do\u011fru \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 do\u011frulamak i\u00e7in kullan\u0131l\u0131r. Jest ve Vue Test Utils ile entegrasyon testleri yazarken, <code>mount<\/code> metodunu kullanmak ve d\u0131\u015f ba\u011f\u0131ml\u0131l\u0131klar\u0131 (API \u00e7a\u011fr\u0131lar\u0131 gibi) mocklamak yayg\u0131n bir yakla\u015f\u0131md\u0131r.<\/p>\n<p><strong>\u00d6rnek Senaryo:<\/strong> Bir <code>ProductList<\/code> bile\u015feni, <code>ProductCard<\/code> bile\u015fenlerini render eder ve <code>Add to Cart<\/code> olay\u0131n\u0131 y\u00f6netir.<\/p>\n<pre><code class=\"language-vue\"><!-- ProductList.vue -->\n<template>\n  <div class=\"product-list\">\n    <ProductCard\n      v-for=\"product in products\"\n      :key=\"product.id\"\n      :product=\"product\"\n      @add-to-cart=\"handleAddToCart\"\n    \/>\n    <p v-if=\"cartMessage\">{{ cartMessage }}<\/p>\n  <\/div>\n<\/template>\n\n<script>\nimport ProductCard from '.\/ProductCard.vue'; \/\/ Assume ProductCard is in the same directory\n\nexport default {\n  components: {\n    ProductCard\n  },\n  data() {\n    return {\n      products: [\n        { id: 1, name: 'Product A', image: 'a.jpg', price: 10.00 },\n        { id: 2, name: 'Product B', image: 'b.jpg', price: 20.00 }\n      ],\n      cartMessage: ''\n    };\n  },\n  methods: {\n    handleAddToCart(productId) {\n      const product = this.products.find(p => p.id === productId);\n      if (product) {\n        this.cartMessage = <code>${product.name} added to cart!<\/code>;\n      }\n    }\n  }\n};\n<\/script><\/code><\/pre>\n<pre><code class=\"language-javascript\">\/\/ ProductList.spec.js\nimport { mount } from '@vue\/test-utils';\nimport ProductList from '@\/components\/ProductList.vue';\nimport ProductCard from '@\/components\/ProductCard.vue'; \/\/ Import the child component\n\ndescribe('ProductList.vue integration', () => {\n  it('renders a list of product cards and handles add-to-cart event', async () => {\n    const wrapper = mount(ProductList);\n\n    \/\/ Ensure ProductCard components are rendered\n    const productCards = wrapper.findAllComponents(ProductCard);\n    expect(productCards.length).toBe(2);\n\n    \/\/ Simulate clicking 'Add to Cart' on the first product card\n    await productCards.at(0).find('button').trigger('click');\n\n    \/\/ Check if the cart message is updated\n    expect(wrapper.find('p').text()).toBe('Product A added to cart!');\n  });\n});<\/code><\/pre>\n<p>Bu entegrasyon testinde, <code>shallowMount<\/code> yerine <code>mount<\/code> kullanarak <code>ProductList<\/code> bile\u015fenini ve onun render etti\u011fi <code>ProductCard<\/code> alt bile\u015fenlerini tam olarak render ediyoruz. Ard\u0131ndan, <code>findAllComponents<\/code> ile alt bile\u015fenleri buluyor ve birinin \u00fczerinde bir olay\u0131 tetikleyerek ebeveyn bile\u015fenin bu olaya nas\u0131l tepki verdi\u011fini kontrol ediyoruz. Bu t\u00fcr testler, bile\u015fenler aras\u0131ndaki etkile\u015fimlerin beklenen \u015fekilde \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 do\u011frulamak i\u00e7in \u00e7ok \u00f6nemlidir.<\/p>\n<p>Harici API \u00e7a\u011fr\u0131lar\u0131 gibi ba\u011f\u0131ml\u0131l\u0131klar\u0131 olan entegrasyon testlerinde, bu \u00e7a\u011fr\u0131lar\u0131 <code>jest.mock('axios')<\/code> gibi y\u00f6ntemlerle veya <code>msw<\/code> (Mock Service Worker) gibi k\u00fct\u00fcphanelerle mocklamak, testlerin h\u0131zl\u0131 ve deterministik olmas\u0131n\u0131 sa\u011flar.<\/p>\n<h3>Test Kapsam\u0131 (Test Coverage) ve Raporlama<\/h3>\n<p>Test kapsam\u0131, kodunuzun ne kadar\u0131n\u0131n otomatik testler taraf\u0131ndan y\u00fcr\u00fct\u00fcld\u00fc\u011f\u00fcn\u00fc g\u00f6steren bir \u00f6l\u00e7\u00fctt\u00fcr. Y\u00fcksek bir test kapsam\u0131, kodunuzun daha fazla k\u0131sm\u0131n\u0131n test edildi\u011fi anlam\u0131na gelir ve bu da potansiyel hatalar\u0131 yakalama olas\u0131l\u0131\u011f\u0131n\u0131 art\u0131r\u0131r. Jest, yerle\u015fik kapsam raporlama yeteneklerine sahiptir.<\/p>\n<p><strong>Kapsam Raporu Olu\u015fturma:<\/strong><br \/>\n<code>jest --coverage<\/code> komutunu \u00e7al\u0131\u015ft\u0131rarak kapsam raporu olu\u015fturabilirsiniz. Bu komut, testlerinizi \u00e7al\u0131\u015ft\u0131r\u0131r ve testler taraf\u0131ndan y\u00fcr\u00fct\u00fclen kod sat\u0131rlar\u0131n\u0131n, fonksiyonlar\u0131n\u0131n, dallar\u0131n\u0131n ve ifadelerinin y\u00fczdesini g\u00f6steren bir \u00f6zet raporu terminalde g\u00f6r\u00fcnt\u00fcler. Ayr\u0131ca, projenizin k\u00f6k dizininde <code>coverage<\/code> ad\u0131nda bir dizin olu\u015fturur ve ayr\u0131nt\u0131l\u0131 HTML raporlar\u0131 i\u00e7erir. Bu HTML raporlar\u0131, hangi kod sat\u0131rlar\u0131n\u0131n test edildi\u011fini (ye\u015fil) ve edilmedi\u011fini (k\u0131rm\u0131z\u0131) g\u00f6rsel olarak g\u00f6sterir, bu da test edilmemi\u015f alanlar\u0131 kolayca tespit etmenizi sa\u011flar.<\/p>\n<p><strong><code>jest.config.js<\/code> ile Kapsam Yap\u0131land\u0131rmas\u0131:<\/strong><br \/>\n<code>jest.config.js<\/code> dosyas\u0131nda <code>collectCoverage<\/code> se\u00e7ene\u011fini <code>true<\/code> olarak ayarlayarak her test \u00e7al\u0131\u015ft\u0131rmas\u0131nda kapsam raporlar\u0131n\u0131n otomatik olarak olu\u015fturulmas\u0131n\u0131 sa\u011flayabilirsiniz. Ayr\u0131ca, <code>collectCoverageFrom<\/code> se\u00e7ene\u011fi ile hangi dosyalar\u0131n kapsama dahil edilece\u011fini veya hari\u00e7 tutulaca\u011f\u0131n\u0131 belirtebilirsiniz. Bu, sadece uygulaman\u0131z\u0131n kendi kodunu kapsama dahil etmenize ve \u00fc\u00e7\u00fcnc\u00fc taraf k\u00fct\u00fcphaneleri veya yap\u0131land\u0131rma dosyalar\u0131n\u0131 hari\u00e7 tutman\u0131za olanak tan\u0131r.<\/p>\n<pre><code class=\"language-javascript\">\/\/ jest.config.js\nmodule.exports = {\n  \/\/ ... di\u011fer yap\u0131land\u0131rmalar\n  collectCoverage: true,\n  collectCoverageFrom: [\n    'src\/<em><\/em>\/*.{js,vue}', \/\/ src alt\u0131ndaki t\u00fcm js ve vue dosyalar\u0131n\u0131 dahil et\n    '!src\/main.js',      \/\/ main.js'i hari\u00e7 tut (genellikle test edilmez)\n    '!src\/router\/index.js', \/\/ router yap\u0131land\u0131rmas\u0131n\u0131 hari\u00e7 tut\n    '!src\/store\/index.js',  \/\/ store yap\u0131land\u0131rmas\u0131n\u0131 hari\u00e7 tut\n    '!src\/plugins\/*.js'   \/\/ plugin dosyalar\u0131n\u0131 hari\u00e7 tut\n  ],\n  coverageThreshold: { \/\/ \u0130ste\u011fe ba\u011fl\u0131: Kapsam e\u015fiklerini belirleme\n    global: {\n      branches: 80,\n      functions: 80,\n      lines: 80,\n      statements: 80\n    }\n  }\n};<\/code><\/pre>\n<p><code>coverageThreshold<\/code> se\u00e7ene\u011fi ile belirli bir kapsam y\u00fczdesinin alt\u0131na d\u00fc\u015f\u00fcld\u00fc\u011f\u00fcnde testlerin ba\u015far\u0131s\u0131z olmas\u0131n\u0131 sa\u011flayabilirsiniz. Bu, CI\/CD s\u00fcre\u00e7lerinde kod kalitesini garanti alt\u0131na almak i\u00e7in \u00e7ok faydal\u0131d\u0131r.<\/p>\n<p><strong>CI\/CD Entegrasyonu:<\/strong><br \/>\nTest kapsam\u0131 raporlar\u0131, s\u00fcrekli entegrasyon ve s\u00fcrekli da\u011f\u0131t\u0131m (CI\/CD) s\u00fcre\u00e7lerinin \u00f6nemli bir par\u00e7as\u0131d\u0131r. Her kod de\u011fi\u015fikli\u011finde testlerin otomatik olarak \u00e7al\u0131\u015ft\u0131r\u0131lmas\u0131 ve kapsam e\u015fiklerinin kontrol edilmesi, kod taban\u0131na entegre edilen yeni kodun kalitesini korumaya yard\u0131mc\u0131 olur. Bir pull request birle\u015ftirilmeden \u00f6nce belirli bir kapsam e\u015fi\u011fini kar\u015f\u0131lamas\u0131 gerekti\u011fi kural\u0131n\u0131 uygulayarak, geli\u015ftiricileri test yazmaya te\u015fvik edebilir ve kod kalitesini s\u00fcrekli olarak art\u0131rabilirsiniz.<\/p>\n<h3>\u0130yi Test Yazma Pratikleri ve \u0130pu\u00e7lar\u0131<\/h3>\n<p>Etkili ve s\u00fcrd\u00fcr\u00fclebilir testler yazmak, sadece do\u011fru ara\u00e7lar\u0131 kullanmakla kalmaz, ayn\u0131 zamanda iyi pratikleri de benimsemeyi gerektirir.<\/p>\n<p>1.  <strong>Testleri K\u00fc\u00e7\u00fck ve Odakl\u0131 Tutun (Arrange-Act-Assert):<\/strong> Her testin tek bir \u015feyi test etmeye odaklanmas\u0131n\u0131 sa\u011flay\u0131n. Genellikle &#8220;Arrange&#8221; (haz\u0131rl\u0131k), &#8220;Act&#8221; (eylem) ve &#8220;Assert&#8221; (do\u011frulama) ad\u0131mlar\u0131n\u0131 takip edin. Bu, testlerin okunabilirli\u011fini art\u0131r\u0131r ve bir testin neden ba\u015far\u0131s\u0131z oldu\u011funu anlamay\u0131 kolayla\u015ft\u0131r\u0131r.<br \/>\n    *   <strong>Arrange:<\/strong> Test i\u00e7in gerekli \u00f6n ko\u015fullar\u0131 ve verileri ayarlay\u0131n (bile\u015feni mount etme, prop&#8217;lar\u0131 g\u00f6nderme, mock&#8217;lar\u0131 yap\u0131land\u0131rma).<br \/>\n    *   <strong>Act:<\/strong> Test etti\u011finiz birimin davran\u0131\u015f\u0131n\u0131 tetikleyin (bir butona t\u0131klama, bir metodu \u00e7a\u011f\u0131rma, bir prop&#8217;u g\u00fcncelleme).<br \/>\n    *   <strong>Assert:<\/strong> Beklenen sonucun ger\u00e7ekle\u015fti\u011fini do\u011frulay\u0131n (DOM&#8217;daki metni kontrol etme, bir olay\u0131n yay\u0131l\u0131p yay\u0131lmad\u0131\u011f\u0131n\u0131 kontrol etme, bir mock fonksiyonunun \u00e7a\u011fr\u0131l\u0131p \u00e7a\u011fr\u0131lmad\u0131\u011f\u0131n\u0131 kontrol etme).<\/p>\n<p>2.  <strong>Her Testin Bir Amac\u0131 Olsun:<\/strong> Testlerinizin neyi test etti\u011fini a\u00e7\u0131k\u00e7a belirten anlaml\u0131 isimler verin. \u00d6rne\u011fin, &#8220;renders props.name when passed&#8221; gibi bir isim, testin amac\u0131n\u0131 net bir \u015fekilde belirtir.<\/p>\n<p>3.  <strong>D\u0131\u015f Ba\u011f\u0131ml\u0131l\u0131klar\u0131 Mock&#8217;lay\u0131n:<\/strong> API \u00e7a\u011fr\u0131lar\u0131, Vuex store&#8217;u, Vue Router veya global servisler gibi d\u0131\u015f ba\u011f\u0131ml\u0131l\u0131klar\u0131 mock&#8217;layarak testlerinizi izole edin. Bu, testlerin h\u0131zl\u0131, deterministik olmas\u0131n\u0131 ve d\u0131\u015f sistemlerin durumundan etkilenmemesini sa\u011flar. <code>jest.fn()<\/code>, <code>jest.spyOn()<\/code>, <code>createLocalVue<\/code> ve <code>mocks<\/code> se\u00e7enekleri bu konuda \u00e7ok yard\u0131mc\u0131d\u0131r.<\/p>\n<p>4.  <strong><code>shallowMount<\/code> Kullan\u0131m\u0131n\u0131 Tercih Edin (Birim Testleri \u0130\u00e7in):<\/strong> Birim testlerinde, <code>shallowMount<\/code> kullanarak alt bile\u015fenleri stub&#8217;lay\u0131n. Bu, sadece test edilen bile\u015fenin kendi mant\u0131\u011f\u0131na odaklanman\u0131z\u0131 sa\u011flar ve alt bile\u015fenlerdeki de\u011fi\u015fikliklerden kaynaklanabilecek test k\u0131r\u0131lmalar\u0131n\u0131 \u00f6nler. Entegrasyon testleri i\u00e7in <code>mount<\/code> kullan\u0131n.<\/p>\n<p>5.  <strong><code>data-testid<\/code> veya <code>id<\/code> Nitelikleri Kullan\u0131n:<\/strong> Testlerinizde DOM elementlerini se\u00e7erken, <code>data-testid=\"my-element\"<\/code> gibi test ama\u00e7l\u0131 \u00f6zel nitelikler veya benzersiz <code>id<\/code>&#8216;ler kullan\u0131n. Bu, CSS s\u0131n\u0131flar\u0131 veya element etiketleri gibi s\u0131k de\u011fi\u015febilecek se\u00e7icilere g\u00f6re daha sa\u011flam testler yazman\u0131z\u0131 sa\u011flar.<\/p>\n<p>6.  <strong>Hata Mesajlar\u0131n\u0131 Okuyun:<\/strong> Bir test ba\u015far\u0131s\u0131z oldu\u011funda, Jest&#8217;in sa\u011flad\u0131\u011f\u0131 hata mesajlar\u0131n\u0131 dikkatlice okuyun. Bu mesajlar, sorunun k\u00f6kenini anlamak i\u00e7in de\u011ferli ipu\u00e7lar\u0131 i\u00e7erir.<\/p>\n<p>7.  <strong>Testleri H\u0131zl\u0131 \u00c7al\u0131\u015ft\u0131r\u0131n:<\/strong> Test paketinizin h\u0131zl\u0131 \u00e7al\u0131\u015fmas\u0131, geli\u015ftirme d\u00f6ng\u00fcs\u00fcn\u00fc h\u0131zland\u0131r\u0131r. A\u011f \u00e7a\u011fr\u0131lar\u0131n\u0131, veritaban\u0131 i\u015flemlerini veya pahal\u0131 hesaplamalar\u0131 mock&#8217;layarak test s\u00fcrelerini k\u0131salt\u0131n. Jest&#8217;in <code>--watch<\/code> modu, sadece de\u011fi\u015fen dosyalarla ilgili testleri \u00e7al\u0131\u015ft\u0131rarak h\u0131zl\u0131 geri bildirim sa\u011flar.<\/p>\n<p>8.  <strong>Test Kodunu Refactor Edin:<\/strong> Test kodunuz da \u00fcretim kodunuz kadar \u00f6nemlidir. Tekrarlayan kodlar\u0131 yard\u0131mc\u0131 fonksiyonlara ta\u015f\u0131y\u0131n, test dosyalar\u0131n\u0131z\u0131 d\u00fczenli tutun ve okunakl\u0131 olmas\u0131n\u0131 sa\u011flay\u0131n.<\/p>\n<p>9.  <strong>Edge Case&#8217;leri Test Edin:<\/strong> Sadece &#8220;mutlu yolu&#8221; (happy path) de\u011fil, ayn\u0131 zamanda hata durumlar\u0131n\u0131, bo\u015f giri\u015fleri, s\u0131n\u0131r ko\u015fullar\u0131n\u0131 ve beklenmeyen senaryolar\u0131 da test edin.<\/p>\n<p>10. <strong>Snapshot Testlerini Ak\u0131ll\u0131ca Kullan\u0131n:<\/strong> Snapshot testleri g\u00fc\u00e7l\u00fc olsa da, dinamik i\u00e7erik veya s\u0131k de\u011fi\u015fen bile\u015fenler i\u00e7in dikkatli kullan\u0131lmal\u0131d\u0131r. Snapshot&#8217;lar\u0131 g\u00fcncellerken de\u011fi\u015fiklikleri her zaman g\u00f6zden ge\u00e7irin.<\/p>\n<h3>Sonu\u00e7<\/h3>\n<p>Vue.js uygulamalar\u0131n\u0131 Jest ve Vue Test Utils ile test etmek, uygulaman\u0131z\u0131n kalitesini, g\u00fcvenilirli\u011fini ve s\u00fcrd\u00fcr\u00fclebilirli\u011fini \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131ran kritik bir geli\u015ftirme prati\u011fidir. Bu makalede, birim testlerinden entegrasyon testlerine, Vuex ve Vue Router entegrasyonundan snapshot testlerine kadar geni\u015f bir yelpazede Vue bile\u015fenlerini nas\u0131l test edece\u011finizi ayr\u0131nt\u0131l\u0131 olarak inceledik. Jest&#8217;in g\u00fc\u00e7l\u00fc \u00f6zellikleri ve Vue Test Utils&#8217;in Vue \u00f6zelindeki yard\u0131mc\u0131 fonksiyonlar\u0131 sayesinde, karma\u015f\u0131k bile\u015fenleri bile kolayca izole edebilir, kullan\u0131c\u0131 etkile\u015fimlerini sim\u00fcle edebilir ve beklenen davran\u0131\u015flar\u0131 do\u011frulayabilirsiniz.<\/p>\n<p>Unutulmamal\u0131d\u0131r ki test yazmak sadece hatalar\u0131 yakalamakla kalmaz, ayn\u0131 zamanda kodunuzun daha iyi tasarlanmas\u0131na, mod\u00fclerli\u011fin art\u0131r\u0131lmas\u0131na ve geli\u015ftiricilerin daha g\u00fcvenle de\u011fi\u015fiklik yapmas\u0131na olanak tan\u0131r. \u0130yi yaz\u0131lm\u0131\u015f testler, uygulaman\u0131z\u0131n zaman i\u00e7inde b\u00fcy\u00fcmesini ve geli\u015fmesini destekleyen de\u011ferli bir g\u00fcvenlik a\u011f\u0131 olu\u015fturur. Testleri geli\u015ftirme s\u00fcrecinizin ayr\u0131lmaz bir par\u00e7as\u0131 haline getirerek, daha sa\u011flam, bak\u0131m\u0131 kolay ve y\u00fcksek kaliteli Vue.js uygulamalar\u0131 in\u015fa edebilirsiniz. Test, tek seferlik bir g\u00f6rev de\u011fil, s\u00fcrekli bir s\u00fcre\u00e7tir ve uygulaman\u0131zla birlikte evrilmelidir.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Vue Uygulamalar\u0131n\u0131 Jest ile Test Etmek: Kapsaml\u0131 Bir Rehber\nGiri\u015f: Neden Test Etmeliyiz?\nYaz\u0131l\u0131m geli\u015ftirme s\u00fcre\u00e7lerinde test, kod kalitesin","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1402],"tags":[],"class_list":{"0":"post-34743","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-vue","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Vue Uygulamalar\u0131n\u0131 Jest ile Test Etmek: Kapsaml\u0131 Bir Rehber - Kodlar\u0131n Gizemli D\u00fcnyas\u0131<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/vue-uygulamalarini-jest-ile-test-etmek-kapsamli-bir-rehber\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vue Uygulamalar\u0131n\u0131 Jest ile Test Etmek: Kapsaml\u0131 Bir Rehber\" \/>\n<meta property=\"og:description\" content=\"Vue Uygulamalar\u0131n\u0131 Jest ile Test Etmek: Kapsaml\u0131 Bir Rehber Giri\u015f: Neden Test Etmeliyiz? 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