--- title: Clean Swift Unit Tests, Zero Overhead | daily.dev description: A live coding session demonstrating unit testing in Swift, focusing on fixing compilation errors and implementing test-driven development. The tutorial walks... canonical: https://daily.dev/posts/clean-swift-unit-tests-zero-overhead-ezor2ehqd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Clean Swift Unit Tests, Zero Overhead | daily.dev og:description: A live coding session demonstrating unit testing in Swift, focusing on fixing compilation errors and implementing test-driven development. The tutorial walks... og:url: https://daily.dev/posts/clean-swift-unit-tests-zero-overhead-ezor2ehqd og:image: https://api.daily.dev/og/posts/EZor2ehQD.png og:image:alt: Clean Swift Unit Tests, Zero Overhead og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Clean Swift Unit Tests, Zero Overhead **[Rebeloper](https://daily.dev/sources/rebeloper)** · 1 min read · 1 upvotes · 0 comments ## Summary A live coding session demonstrating unit testing in Swift, focusing on fixing compilation errors and implementing test-driven development. The tutorial walks through debugging a test case, converting a let variable to var for mutability, and creating test functions using the given-when-then pattern. The presenter encourages viewer engagement to produce more content on test-driven development and unit testing. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#testing](https://daily.dev/tags/testing), [#ios](https://daily.dev/tags/ios), [#swift](https://daily.dev/tags/swift), [#tdd](https://daily.dev/tags/tdd) [View this post on daily.dev](https://daily.dev/posts/clean-swift-unit-tests-zero-overhead-ezor2ehqd) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Clean Swift Unit Tests, Zero Overhead","url":"https://daily.dev/posts/clean-swift-unit-tests-zero-overhead-ezor2ehqd","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/clean-swift-unit-tests-zero-overhead-ezor2ehqd"},"datePublished":"2026-01-26T09:11:03.687Z","dateModified":"2026-01-26T09:36:55.166Z","description":"A live coding session demonstrating unit testing in Swift, focusing on fixing compilation errors and implementing test-driven development. The tutorial walks...","image":"https://i.ytimg.com/vi/Lc292pZvmGI/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/Lc292pZvmGI/sddefault.jpg","isAccessibleForFree":true,"articleSection":"Rebeloper","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Rebeloper","logo":"https://media.daily.dev/image/upload/s--W0sZL8K4--/f_auto/v1726990075/logos/rebeloper","url":"https://daily.dev/sources/rebeloper"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/clean-swift-unit-tests-zero-overhead-ezor2ehqd","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"testing,ios,swift,tdd","timeRequired":"PT1M","video":{"@type":"VideoObject","name":"Clean Swift Unit Tests, Zero Overhead","description":"A live coding session demonstrating unit testing in Swift, focusing on fixing compilation errors and implementing test-driven development. The tutorial walks...","thumbnailUrl":"https://i.ytimg.com/vi/Lc292pZvmGI/sddefault.jpg","uploadDate":"2026-01-26T09:11:03.687Z","duration":"PT1M","url":"https://api.daily.dev/r/EZor2ehQD","embedUrl":"https://www.youtube.com/embed/Lc292pZvmGI"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Rebeloper","item":"https://daily.dev/sources/rebeloper"},{"@type":"ListItem","position":3,"name":"Clean Swift Unit Tests, Zero Overhead"}]} ```