Kotlin Multiplatform Testing

Use this skill when designing, implementing, or reviewing tests in a Kotlin Multiplatform project.

This skill is intentionally strict. Its purpose is to keep the test suite fast, trustworthy, behavior-focused, and aligned with Android’s testing guidance while still respecting shared KMP boundaries and Compose Multiplatform testing patterns.

Primary goals

The testing strategy should optimize for:

• strong confidence in business logic
• fast feedback from local/unit tests
• clear separation between local, Robolectric, instrumented, and UI tests
• behavior-focused tests instead of implementation-detail tests
• appropriate use of test doubles
• stable and performant larger tests
• isolated testing of shared KMP logic
• practical Compose Multiplatform UI test coverage
• targeted screenshot testing where visual regressions matter