--- title: Understanding Dependencies injection with unit-tests and... description: A hands-on exploration of Koin's dependency injection mechanics using unit tests as executable documentation. Covers the core DI patterns: `single` (shared... canonical: https://daily.dev/posts/understanding-dependencies-injection-with-unit-tests-and-koin-jr6zlojsx twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Understanding Dependencies injection with unit-tests and Koin | daily.dev og:description: A hands-on exploration of Koin's dependency injection mechanics using unit tests as executable documentation. Covers the core DI patterns: `single` (shared... og:url: https://daily.dev/posts/understanding-dependencies-injection-with-unit-tests-and-koin-jr6zlojsx og:image: https://api.daily.dev/og/posts/Jr6ZLoJSx.png og:image:alt: Understanding Dependencies injection with unit-tests and Koin 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. # Understanding Dependencies injection with unit-tests and Koin **[ITNEXT](https://daily.dev/sources/itnext)** · 5 min read · 0 upvotes · 0 comments ## Summary A hands-on exploration of Koin's dependency injection mechanics using unit tests as executable documentation. Covers the core DI patterns: `single` (shared singleton instances), `factory` (per-resolution creation), qualifiers (resolving type ambiguity when multiple implementations exist), scopes (contextual lifecycle boundaries), scope graph isolation, and linked scopes for dynamic dependency composition. Each concept is demonstrated with runnable Kotlin test code that proves the behavior rather than just describing it. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Dependency Injection with Koin: Scopes](https://daily.dev/posts/dependency-injection-with-koin-scopes-wv4mnp2gh) · ITNEXT · 0 upvotes · 0 comments - [Dependency Injection with Koin, interfaces and qualifiers](https://daily.dev/posts/dependency-injection-with-koin-interfaces-and-qualifiers-dyu0ehq4m) · ITNEXT · 3 upvotes · 0 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#android](https://daily.dev/tags/android), [#kotlin](https://daily.dev/tags/kotlin), [#dependency-injection](https://daily.dev/tags/dependency-injection) [View this post on daily.dev](https://daily.dev/posts/understanding-dependencies-injection-with-unit-tests-and-koin-jr6zlojsx) ```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":"Understanding Dependencies injection with unit-tests and Koin","url":"https://daily.dev/posts/understanding-dependencies-injection-with-unit-tests-and-koin-jr6zlojsx","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/understanding-dependencies-injection-with-unit-tests-and-koin-jr6zlojsx"},"datePublished":"2026-02-24T09:02:47.573Z","dateModified":"2026-02-24T09:03:11.115Z","description":"A hands-on exploration of Koin's dependency injection mechanics using unit tests as executable documentation. 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