mocking-with-mockk

What problem does it solve?

This Skill helps you reliably mock Kotlin collaborators in JVM unit tests when suspend functions, coroutines, and Kotlin object/singletons are involved, so your tests can verify interactions without brittle workarounds.

Core Features & Use Cases

• Suspend-safe stubbing and verification: Use coEvery { ... } returns ... and coVerify { ... } to avoid runBlocking-style wrappers and to prevent Continuation-matching errors.
• Kotlin-native mocking coverage: Mock Kotlin object/singleton behavior (mockkObject), statics (mockkStatic), and constructors (mockkConstructor) with proper cleanup.
• Strict interaction testing with argument capture: Capture arguments via slot<T>(), enforce call ordering using verifySequence / verifyOrder, and guard against unexpected calls using confirmVerified.

Quick Start

Tell the AI to generate a JVM unit-test setup that uses MockK to stub a suspend repository method with coEvery, verify it with coVerify, capture a saved entity with slot, and include unmockkAll() teardown when any static/object/constructor mocking is used.