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kotlin-testing

Write Kotlin tests using Kotest, MockK, coroutine testing, and Kover coverage.

1|Updated Feb 22, 2026
Search Tags:#testing#tdd#code coverage#kotlin#property-based testing#mockk#kotest
One-click install
npx skills add https://github.com/TakMczk/copilot-cli-ecc --skill kotlin-testing-takmczk
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: kotlin-testing
Source: https://github.com/TakMczk/copilot-cli-ecc/tree/main/.github/skills/kotlin-testing
Command: npx skills add https://github.com/TakMczk/copilot-cli-ecc --skill kotlin-testing-takmczk

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides comprehensive patterns and examples for writing robust, maintainable tests in Kotlin, ensuring code quality and reliability through TDD and best practices.

Core Features & Use Cases

  • TDD Workflow: Guides you through the RED-GREEN-REFACTOR cycle for idiomatic Kotlin development.
  • Kotest Specs: Demonstrates various Kotest spec styles (StringSpec, FunSpec, BehaviorSpec, DescribeSpec) for different testing needs.
  • Mocking: Covers advanced MockK usage, including coroutine mocking and argument capturing.
  • Property-Based Testing: Introduces Kotest's property testing for rigorous validation.
  • Coverage: Explains Kover integration for measuring and enforcing code coverage.
  • Use Case: When developing a new Kotlin feature, use this Skill to follow TDD, write effective unit tests with Kotest and MockK, and ensure high code coverage with Kover.

Quick Start

Follow the TDD workflow to write a failing test for a new Kotlin function, then implement the code to pass the test.

Frequently Asked Questions about kotlin-testing

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

FAQPage Schema
How do I write Kotlin tests using Kotest and MockK?▼

You can write Kotlin tests using Kotest specs like StringSpec or FunSpec and use MockK for advanced mocking, including coroutine mocking and argument capturing, to ensure reliable test coverage.

What is property-based testing in Kotlin and how does Kotest support it?▼

Property-based testing in Kotlin validates code against generated inputs rather than fixed examples, and Kotest supports this with generators to provide rigorous validation across a wide range of data.

How do I test Kotlin coroutines with runTest?▼

You test Kotlin coroutines using the runTest function to control virtual time and verify asynchronous behavior, often combining it with MockK to mock suspendable functions.

Can I use Kover to measure code coverage for my Kotlin project?▼

Yes, you can integrate Kover to measure and enforce code coverage in your Kotlin project, ensuring your TDD workflow maintains high reliability across your codebase.

What is the best way to structure data-driven tests in Kotest?▼

The best way to structure data-driven tests in Kotest is using the withData function, which allows you to run the same test logic against multiple inputs cleanly and maintainably.

How do I test a Ktor application using testApplication?▼

You test a Ktor application using the testApplication function to simulate HTTP requests and verify route responses, ensuring your web server behaves correctly without a real server deployment.

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