--- title: C# Tip: Use TestCase to run similar unit tests with NUnit description: Shows how to use NUnit's TestCase attribute to consolidate multiple similar unit tests into a single parameterized test method, reducing duplication while... canonical: https://daily.dev/posts/c-tip-use-testcase-to-run-similar-unit-tests-with-nunit-buqtsojgr twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: C# Tip: Use TestCase to run similar unit tests with NUnit | daily.dev og:description: Shows how to use NUnit's TestCase attribute to consolidate multiple similar unit tests into a single parameterized test method, reducing duplication while... og:url: https://daily.dev/posts/c-tip-use-testcase-to-run-similar-unit-tests-with-nunit-buqtsojgr og:image: https://api.daily.dev/og/posts/BuqTSoJGR.png og:image:alt: C# Tip: Use TestCase to run similar unit tests with NUnit 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. # C# Tip: Use TestCase to run similar unit tests with NUnit **[Code4IT](https://daily.dev/sources/code4it)** · 3 min read · 0 upvotes · 0 comments ## Summary Shows how to use NUnit's TestCase attribute to consolidate multiple similar unit tests into a single parameterized test method, reducing duplication while covering different input combinations. Uses a simple Calculator.Sum example to contrast writing separate test methods versus one method annotated with multiple TestCase attributes. Mentions TestCaseSource as a more advanced alternative to be covered later, and links to a related article on custom equality comparers in NUnit. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I avoid writing duplicate NUnit test methods for similar input values? Use the TestCase attribute to parameterize a single test method with multiple sets of input values and expected results. For example, annotating one method with several [TestCase(1, 5, 6)] lines lets you test a Sum function against different inputs without creating separate methods for each case, keeping the test suite DRY. _For hands-on NUnit patterns like this, developers refining their test suites follow testing content on daily.dev._ ## Similar posts on daily.dev - [Single File Test Suites in Dotnet Csharp](https://daily.dev/posts/single-file-test-suites-in-dotnet-csharp-tjsujrxxv) · Ardalis · 1 upvotes · 0 comments - [Today I will… improve test coverage](https://daily.dev/posts/today-i-will-improve-test-coverage-9ytnrgshc) · DevBlogs · 2 upvotes · 1 comments - [5 Architecture Tests You Should Add to Your .NET Projects](https://daily.dev/posts/5-architecture-tests-you-should-add-to-your-net-projects-srtuu4tjc) · Milan Jovanović · 20 upvotes · 0 comments - [Incremental Source Generators Done Right: Prove the Cache Hits — Daily DevOps & .NET](https://daily.dev/posts/incremental-source-generators-done-right-prove-the-cache-hits-daily-devops-net-zr08ag9yu) · Daily DevOps & .NET · 1 upvotes · 0 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/c-tip-use-testcase-to-run-similar-unit-tests-with-nunit-buqtsojgr) ```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":"C# Tip: Use TestCase to run similar unit tests with NUnit","url":"https://daily.dev/posts/c-tip-use-testcase-to-run-similar-unit-tests-with-nunit-buqtsojgr","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/c-tip-use-testcase-to-run-similar-unit-tests-with-nunit-buqtsojgr"},"datePublished":"2026-10-04T13:07:21.514Z","dateModified":"2026-10-04T13:19:39.471Z","description":"Shows how to use NUnit's TestCase attribute to consolidate multiple similar unit tests into a single parameterized test method, reducing duplication while...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/cf799e13fca90b7035b9144b94cf26b4?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/cf799e13fca90b7035b9144b94cf26b4?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Code4IT","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":"Code4IT","logo":"https://media.daily.dev/image/upload/s--OaaG4G10--/f_auto,q_auto/v1791119049/logos/code4it?_a=BAMAMicg0","url":"https://daily.dev/sources/code4it"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/c-tip-use-testcase-to-run-similar-unit-tests-with-nunit-buqtsojgr","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"testing,.net,c#","timeRequired":"PT3M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Code4IT","item":"https://daily.dev/sources/code4it"},{"@type":"ListItem","position":3,"name":"C# Tip: Use TestCase to run similar unit tests with NUnit"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/c-tip-use-testcase-to-run-similar-unit-tests-with-nunit-buqtsojgr#faq","mainEntity":[{"@type":"Question","name":"How do I avoid writing duplicate NUnit test methods for similar input values?","acceptedAnswer":{"@type":"Answer","text":"Use the TestCase attribute to parameterize a single test method with multiple sets of input values and expected results. For example, annotating one method with several [TestCase(1, 5, 6)] lines lets you test a Sum function against different inputs without creating separate methods for each case, keeping the test suite DRY. For hands-on NUnit patterns like this, developers refining their test suites follow testing content on daily.dev."}}]} ```