--- title: Writing The Perfect Tests for your Application | daily.dev description: A practical overview of three categories of tests every application should have: tests that guide development (TDD), tests that help debug regressions using... canonical: https://daily.dev/posts/writing-the-perfect-tests-for-your-application-ddoywynjt twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Writing The Perfect Tests for your Application | daily.dev og:description: A practical overview of three categories of tests every application should have: tests that guide development (TDD), tests that help debug regressions using... og:url: https://daily.dev/posts/writing-the-perfect-tests-for-your-application-ddoywynjt og:image: https://api.daily.dev/og/posts/DdOyWYNJt.png og:image:alt: Writing The Perfect Tests for your Application 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. # Writing The Perfect Tests for your Application **[Neciu Dan](https://daily.dev/sources/neciudan)** · 6 min read · 0 upvotes · 0 comments ## Summary A practical overview of three categories of tests every application should have: tests that guide development (TDD), tests that help debug regressions using git bisect, and synthetic/smoke tests running on production to catch live issues. The post explains how TDD's red-green-refactor cycle improves code design, how pairing an E2E test with git bisect automates bug-origin hunting, and why a simple production smoke test monitored via tools like Datadog or Sentry provides more peace of mind than complex CI/CD pipelines alone. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Epistemology of software](https://daily.dev/posts/epistemology-of-software-bhszdbbab) · ploeh blog · 0 upvotes · 0 comments - [Getting Feedback from Test-Driven Development and Testing in Production](https://daily.dev/posts/getting-feedback-from-test-driven-development-and-testing-in-production-egde4rfta) · InfoQ · 0 upvotes · 0 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#tdd](https://daily.dev/tags/tdd) [View this post on daily.dev](https://daily.dev/posts/writing-the-perfect-tests-for-your-application-ddoywynjt) ```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":"Writing The Perfect Tests for your Application","url":"https://daily.dev/posts/writing-the-perfect-tests-for-your-application-ddoywynjt","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/writing-the-perfect-tests-for-your-application-ddoywynjt"},"datePublished":"2026-04-19T08:01:56.008Z","dateModified":"2026-04-19T08:02:29.733Z","description":"A practical overview of three categories of tests every application should have: tests that guide development (TDD), tests that help debug regressions using...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/76d00627e16d208202393ff70cebc64e?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/76d00627e16d208202393ff70cebc64e?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Neciu Dan","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":"Neciu Dan","logo":"https://media.daily.dev/image/upload/s--xeHLtkTA--/f_auto,q_auto/v1776585705/logos/neciudan","url":"https://daily.dev/sources/neciudan"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/writing-the-perfect-tests-for-your-application-ddoywynjt","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"testing,tdd","timeRequired":"PT6M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Neciu Dan","item":"https://daily.dev/sources/neciudan"},{"@type":"ListItem","position":3,"name":"Writing The Perfect Tests for your Application"}]} ```