kotlin-testing

Guide Kotlin testing with Kotest, MockK, coroutines, and Kover coverage.

Updated Mar 28, 2026
One-click install
npx skills add https://github.com/adomot/claude-settings --skill kotlin-testing-adomot
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: kotlin-testing
Source: https://github.com/adomot/claude-settings/tree/main/skills/aegis/kotlin-testing
Command: npx skills add https://github.com/adomot/claude-settings --skill kotlin-testing-adomot

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Provides a structured Kotlin testing pattern guide using Kotest, MockK, coroutine testing, property-based testing, and Kover coverage to improve reliability and maintainability of Kotlin code.

Core Features & Use Cases

  • Kotest specs: supports StringSpec, FunSpec, BehaviorSpec, and DescribeSpec styles for flexible test design.
  • MockK integration: practical guidance for clean, isolated unit tests with coroutine support.
  • Coroutine testing: patterns for suspending functions, runTest, and flow testing to ensure correct asynchronous behavior.
  • Property-based testing: strategies to generate diverse input data and validate invariants at scale.
  • Kover coverage: setup and usage for measuring and enforcing Kotlin code coverage.

Quick Start

Install Kotest and MockK in your Kotlin project and begin writing green tests with a TDD workflow, including coroutine and property-based tests.

Frequently Asked Questions about kotlin-testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I test Kotlin coroutines and suspending functions with Kotest?

Test Kotlin coroutines using the runTest API within Kotest specs to validate suspending functions and ensure correct asynchronous behavior. This approach provides structured patterns for handling complex coroutine flows and verifying timing logic without blocking actual test threads.

What is the best way to mock dependencies in Kotlin unit tests?

Mock dependencies in Kotlin unit tests using MockK, which provides clean, isolated testing patterns with dedicated coroutine support. It enables you to mock classes and functions effectively while maintaining idiomatic Kotlin syntax across isolated test suites.

Can I use BehaviorSpec and StringSpec styles in the same Kotest project?

Yes, you can use BehaviorSpec, StringSpec, FunSpec, and DescribeSpec styles within the same Kotest project. This flexibility allows you to design tests according to specific domain scenarios, choosing the most readable structure for each unit or behavior-driven test.

How do I enforce Kotlin code coverage thresholds in a CI pipeline?

Enforce Kotlin code coverage thresholds by integrating Kover into your build process. Kover measures execution metrics across unit and integration tests, allowing you to set strict coverage requirements and fail pipelines when code lacks sufficient test validation.

What is property-based testing and how does it apply to Kotlin?

Property-based testing in Kotlin generates diverse input data automatically to validate code invariants at scale. Instead of writing individual test cases, you define properties that must hold true, and the framework iterates through generated scenarios to uncover hidden edge cases.

Does TDD workflow integrate well with Kotest and MockK?

Yes, TDD workflows integrate seamlessly with Kotest and MockK to help you write green tests efficiently. You can define expected behaviors using expressive spec styles first, mock external dependencies immediately, then implement the logic to satisfy the structured test requirements.