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The first Kotest release of 2026 is here - 6.1 'Bouncing Boimler'
Compatible with Kotlin 2.0, 2.1, 2.2 and 2.3
Enhanced data-testing with new syntax that mirrors the spec style to enable more intuitive tests. This also gives you control over how data tests interact with test lifecycle callbacks!
Much improved IDE plugin support including running individual tests for native targets and fixes for many long standing issues. Re-run tests and jump to source for all nested tests in JVM mode
The test framework has been updated with Jasmine style f-focused syntax to mirror the x-disabled syntax.
Support for JUnit 6 via the new kotest-runner-junit6 module.
Many improvements and bug fixes to our assertions library including support for custom equality in shouldBe assertions
New assertions added such as shouldBeAtMost(x) and shouldBeAtLeast(y) for primitives. A reminder that assertions don't require the Kotest test framework. They are still the best Kotlin assertions library, in our opinion, even if you are using JUnit or another test framework.
Various property test improvements such as new Arb types for arrays and support for specifying Arb collection sizes globally. Just like assertions, the property testing library doesn't require the Kotest test framework.
What's Changed
Removing deprecated EqualityMatcherResult by @sksamuel in #5239
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This PR contains the following updates:
5.8.1→6.2.15.8.1→6.2.15.8.1→6.2.1Release Notes
kotest/kotest (io.kotest:kotest-assertions-core-jvm)
v6.2.1Compare Source
v6.2.0Compare Source
v6.1.11Compare Source
What's Changed
Full Changelog: kotest/kotest@v6.1.10...6.1.11
v6.1.10Compare Source
What's Changed
New Contributors
Full Changelog: kotest/kotest@v6.1.9...v6.1.10
v6.1.9Compare Source
Full Changelog: kotest/kotest@v6.1.8...v6.1.9
The Gradle 9.4 --tests filter change was missed from the 6.1.8 release.
This 6.1.9 release includes it.
If you are using Gradle 9.4+ then you need this build to run a single test from the IDE.
v6.1.8Compare Source
What's Changed
SpringExtensionby @T45K in #5788Discoveryto improve class visibility filtering by @sksamuel in #5790New Contributors
Full Changelog: kotest/kotest@v6.1.7...v6.1.8
v6.1.7Compare Source
What's Changed
Full Changelog: kotest/kotest@v6.1.6...v6.1.7
v6.1.6Compare Source
What's Changed
Full Changelog: kotest/kotest@v6.1.5...v6.1.6
v6.1.5Compare Source
What's Changed
kotlin-compile-testingto version 0.12.1 to support Kotlin 2.3 by @sksamuel in #5736Full Changelog: kotest/kotest@v6.1.4...v6.1.5
v6.1.4Compare Source
What's Changed
Property<Boolean>for extension values by @sksamuel in #5658--testsissue by @T45K in #5691New Contributors
Full Changelog: kotest/kotest@v6.1.3...v6.1.4
v6.1.3Compare Source
What's Changed
New Contributors
Full Changelog: kotest/kotest@v6.1.2...v6.1.3
v6.1.2Compare Source
What's Changed
Full Changelog: kotest/kotest@6.1.2...v6.1.2
v6.1.1Compare Source
What's Changed
ktor-server-coredependency. by @sksamuel in #5587Full Changelog: kotest/kotest@v6.1.0...v6.1.1
v6.1.0Compare Source
The first Kotest release of 2026 is here - 6.1 'Bouncing Boimler'
What's Changed
beBooleanmatcher public by @LeoColman in #5241kotlin-compile-testingto version 0.11.0 inlibs.versions.toml. by @sksamuel in #5251shouldContainAllInAnyOrdermatchers for collections by @sksamuel in #5228InstancePerLeafandInstancePerTest(issue #5261) by @alfonsoristorato in #5274RootTestWithConfigBuilderandRootContainerWithConfigBuilderby @alfonsoristorato in #5315New Contributors
Full Changelog: kotest/kotest@v6.0.7...v6.1.0
v6.0.7Compare Source
What's Changed
Full Changelog: kotest/kotest@v6.0.6...v6.0.7
v6.0.6Compare Source
What's Changed
InstancePerLeafby @T45K in #5201Full Changelog: kotest/kotest@v6.0.5...v6.0.6
v6.0.5Compare Source
What's Changed
InstancePerLeaftests fail when a test leaf has siblings by @T45K in #5139spring.boot.starter.webdependency fromjvmMaintojvmTest. by @sksamuel in #5146Configuration
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