MockK
Mocking library for Kotlin with first-class support for coroutines, object/static mocks and DSL designed around Kotlin idioms.
Our Verdict
Clearly the right mocking library for Kotlin, worth the migration from Mockito for Kotlin-heavy code.
Pros
- Designed around Kotlin idioms from day one
- First-class coroutine and suspend function mocking
- Handles object and top-level function mocks
- Readable DSL versus Mockito-Kotlin glue
Cons
- Slower than Mockito on very large suites
- Mistakes produce cryptic stack traces
- Less Stack Overflow coverage than Mockito
- Mocking everything hides Kotlin design smells
When to Use MockK
Good fit if you need
- Kotlin-idiomatic mocking with coroutine test support
- Object and companion object mocking for Kotlin code
- Verify DSL with natural Kotlin syntax for call assertions
- Mock suspend functions in Kotlin coroutine test suites
Pricing
Price wrong?MockK Pricing
- Pricing Model
- free
- Free Tier
- Yes
- Entry Price
- —
- Enterprise Available
- No
- Transparency Score
- —
Beta — estimates may differ from actual pricing
Estimated Monthly Cost
$25
Estimated Annual Cost
$300
Estimates are approximate and may not reflect current pricing. Always check the official pricing page.
Project Health
Health Score
10
1 day
54d
308
1d
Apache-2.0
Last checked: 2026-04-21
Lock-in Assessment
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