--- title: Dont trust your code coverage | daily.dev description: Code coverage is not enough to ensure the quality of the codebase. Mutation testing is a technique that can help engineers develop quality tests. An... canonical: https://daily.dev/posts/dont-trust-your-code-coverage-jnsfxbwle twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Dont trust your code coverage | daily.dev og:description: Code coverage is not enough to ensure the quality of the codebase. Mutation testing is a technique that can help engineers develop quality tests. An... og:url: https://daily.dev/posts/dont-trust-your-code-coverage-jnsfxbwle og:image: https://api.daily.dev/og/posts/JNsFxbWle.png og:image:alt: Dont trust your code coverage 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. # Dont trust your code coverage **[Medium](https://daily.dev/sources/medium_js)** · 2 min read · 6 upvotes · 0 comments ## Summary Code coverage is not enough to ensure the quality of the codebase. Mutation testing is a technique that can help engineers develop quality tests. An open-source project called Muter allows for easy integration of mutation testing into projects. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#mobile](https://daily.dev/tags/mobile), [#mutation-testing](https://daily.dev/tags/mutation-testing), [#open-source](https://daily.dev/tags/open-source), [#swift](https://daily.dev/tags/swift), [#testing](https://daily.dev/tags/testing) [View this post on daily.dev](https://daily.dev/posts/dont-trust-your-code-coverage-jnsfxbwle) ```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":"Dont trust your code coverage","url":"https://daily.dev/posts/dont-trust-your-code-coverage-jnsfxbwle","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/dont-trust-your-code-coverage-jnsfxbwle"},"datePublished":"2024-01-01T22:13:26.692Z","dateModified":"2026-04-17T02:12:29.066Z","description":"Code coverage is not enough to ensure the quality of the codebase. Mutation testing is a technique that can help engineers develop quality tests. An...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/892c02882946b39181eea6d932778248?_a=AQAEufR","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/892c02882946b39181eea6d932778248?_a=AQAEufR","isAccessibleForFree":true,"articleSection":"Medium","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":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/dont-trust-your-code-coverage-jnsfxbwle","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":6},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"mobile,mutation-testing,open-source,swift,testing","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"Dont trust your code coverage"}]} ```