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Overview
Kotest is a Kotlin testing framework that combines multiple spec styles, rich matchers, property testing, and data-driven testing. On the JVM it integrates with JUnit Platform, and it also supports Kotlin Multiplatform targets including JS, Native, and Wasm.
Features and best fit
Based on official documentation; not hands-on tested · Content checked:
Key features
Write Kotlin tests with selectable spec styles and rich matchers
Styles such as FunSpec and StringSpec structure tests while matchers such as shouldBe provide assertions within the same ecosystem.
Extend into property testing and Multiplatform targets
Adding kotest-property enables generators and shrinking, while JS, Native, and Wasm setups use the framework engine with KSP and the Kotest Gradle plugin.
Sources: [3]
Best fit
Before adoption
Keep Kotest modules aligned on 6.2.5
Runner, assertion, and property modules should stay on the same Kotest release line to avoid runtime compatibility problems.
Check the Kotest 6.x toolchain baseline first
The setup reference lists Kotlin 2.2+, JDK 11+, and Gradle 8.0+ as minimums, with KSP required for JS, Native, and Wasm targets.
Sources: [3]
Official sources
- [1]kotest/kotest repository(2026-09-30)
- [2]Kotest README(2026-09-30)
- [3]Kotest 6.2.5 setup reference(2026-09-30)
- [4]Kotest v6.2.5 release(2026-09-30)
- [5]Kotest Apache 2.0 license(2026-09-30)
Supplemental curator note
Kotest 6.2.5 is a comprehensive Kotlin testing framework. JVM projects commonly combine the JUnit Platform runner with Kotest assertions and optionally property testing. Kotest 6.x requires Kotlin 2.2+, JDK 11+, and Gradle 8+, so the existing toolchain should be checked first.
Try it in 3 steps
- 1
Add the Kotest 6.2.5 runner and assertions
Add the JVM runner and matcher module on the same version and enable useJUnitPlatform() for Gradle tests.
testImplementation("io.kotest:kotest-runner-junit5:6.2.5") testImplementation("io.kotest:kotest-assertions-core:6.2.5") - 2
Create one StringSpec
Import StringSpec and shouldBe, then create a minimal Kotest specification.
class MathTest : StringSpec({ "1 + 1" { 1 + 1 shouldBe 2 } }) - 3
Run the test task
Verify that the Kotest spec is discovered and executed through JUnit Platform.
./gradlew test
Growth
Growth trends · Last 30 days
4,789 Stars
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Categories and tags
Categories
GitHub data
GitHub dataView detailed GitHub data
GitHub Topics
- assertions
- kotlin
- kotlin-js
- kotlin-multiplatform
- matchers
- multiplatform
- property-testing
- test
- testing
- testing-tools
- Stars
- 4,789
- Forks
- 703
- Watchers
- 51
- Open issues
- 49
- Owner type
- Organization
- Primary language
- Kotlin
- License
- Apache-2.0
- Repository last updated
- Sep 28, 2026
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