Kotlin Assertions

Open-source Kotlin projects categorized as Assertions
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Top 7 Kotlin Assertion Projects

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Assertions

  1. Kotest

    Powerful, elegant and flexible test framework for Kotlin with assertions, property testing and data driven tests.

    Project mention: Ultimate Kotlin Cheatsheet | dev.to | 2025-03-29

    Kotest - Testing framework

  2. Stream

    Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

    Stream logo

  3. atrium

    A multiplatform expectation library for Kotlin

  4. strikt

    An assertion library for Kotlin

  5. hamkrest

    Hamcrest for Kotlin

  6. expekt

    BDD assertion library for Kotlin

  7. kiwi

    Fluent assertions for Kotlin (by from-source)

  8. xemantic-kotlin-test

    An AX-first (AI/Agent Experience) Kotlin multiplatform testing library with power-assert compatible assertions DSL and other testing goodies.

  9. InfluxDB

    InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

    InfluxDB logo
NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).

Kotlin Assertions discussion

Kotlin Assertions related posts

  • Why do Kotlin tests (for Gradle projects) have to be inside classes?

    1 project | /r/Kotlin | 28 Jan 2023

  • Kotlin Mutation Tests

    1 project | /r/Kotlin | 25 Jan 2023

  • Kotlin assertion libraries - JUnit, Hamkrest and Strikt

    3 projects | /r/Kotlin | 6 Jan 2023

  • How to improve third-party libraries with Kotlin extensions

    2 projects | dev.to | 6 Dec 2022

  • Testing with fakes different states?

    1 project | /r/androiddev | 3 Aug 2022

  • Which assertion library do you use?

    4 projects | /r/Kotlin | 12 Jul 2022

  • Kotlin&Junit vs Groovy&Spock

    1 project | /r/Kotlin | 5 May 2022
  • A note from our sponsor - InfluxDB
    www.influxdata.com | 23 Dec 2025
    InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now. Learn more →

Index

What are some of the best open-source Assertion projects in Kotlin? This list will help you:

# Project Stars
1 Kotest 4,714
2 atrium 623
3 strikt 607
4 hamkrest 344
5 expekt 171
6 kiwi 17
7 xemantic-kotlin-test 13

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