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2025

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2.2.0 • Improved test logging, Kotest 6 and TestBalloon 0.7.1

Suite

  • Prepared and shared values now log how long they took to initialize (!177)
  • Finalizers run even when the test is cancelled (e.g. because of a timeout, !177)
  • Added the 'log' function to display information about an intermediate value (#16df295b, !180)

Kotest runner

  • Kotest 6.0.4 support. Note that the Kotest configuration has changed, it now requires configuring KSP (#ac719a00)
  • Added support for WASI
  • Removed workaround for Kotest#4077 (#59, !185)

TestBallooon runner

  • TestBalloon 0.7.1 support
  • Force the dependency on the Kotlin-test library. This may help when TestBalloon doesn't release new versions for new versions of Kotlin (#6fbce77c)

Dependencies

  • Kotlin 2.2.20
  • 1 min read

2.1.2 • DebugProbes, TestBalloon IntelliJ plugin and JDK 11+ for all runners

Suite

  • On the JVM, coroutine DebugProbes are enabled automatically to log ongoing coroutines at the end of a test (#45, #87, !172)
  • Added the @TestEntrypoint annotation (#72ea802d)

TestBalloon runner

  • The default timeout is now 10s instead of 1m, like the other runners (#e17b8ad2)
  • Now compatible with JDK 11+ (previously 17+, #614e9963)

Documentation

  • Added more features to the highlight section of the home page (#e4bb5f82)
  • Simplified the Atrium description (#bbe1c05d)
  • Added an explanation to configure the IntelliJ TestBalloon plugin (#5c8b653b)
  • 1 min read

2.1.0 • checkThrows and stable resource management

Suite

  • Warn users that exceptions are printed after finalizers (#81, !150)
  • Added String.matches(String) for easier regex matching (#a9cb1224, !160)
  • Added checkThrows (#5e1653e1, !160)

Compat: Parameterize

  • Support Wasm (!145)
  • Support Parameterize 0.4.0 (Beware: possible binary incompatibilities, !152)

Compat: Arrow

  • Support WasmJS (!159)
  • Renamed assertRaises and assertRaisesWith to checkRaises (#d06de70f, !160)

Compat: KotlinX.Datetime

  • Deprecated the module (!148)

Compat: Filesystem

  • Stabilized the resource management APIs (#66, !157)

Documentation

  • Added copyright headers (!146)

Dependencies

  • Kotlin 2.2.0
  • Kotest 6.0.0.M4
  • TestBalloon 0.4.0
  • 1 min read

2.0.6 • Migration to TestBalloon, WASI support

Suite

  • Added support for Wasm WASI when running with TestBalloon (!143)

Runner: TestBalloon

  • Support all OpenSavvy-supported platforms (!143)
  • All modules are now tested with this runner instead of the Kotest runner (!143)

Compat: Arrow

  • Removed the @ExperimentalTraceApi on assertRaisesWith methods (!142)

Dependencies

  • Kotlin 2.1.21
  • KotlinX.Coroutines 1.10.2
  • KotlinX.Datetime 0.6.2
  • Arrow 2.1.2
  • Gradle TestKit 8.11.1
  • Ktor 3.1.3
  • TestBalloon 0.3.3
  • 1 min read

2.0.3 • Experimental TestBalloon support

TestBalloon Runner

TestBalloon is a new test framework for Kotlin that empowers much more lightweight DSLs and promises easier updates. In this release, we add experimental support (!134) for the very first TestBalloon release.

Once the TestBalloon IntelliJ plugin is released, TestBalloon will likely become the primary target for Prepared.