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kotlin-testing

Configure Kotest, MockK, and runTest for Kotlin unit and integration tests.

86|21|Updated Feb 9, 2026
Search Tags:#tdd#kotlin#coroutines#mockk#property-based-testing#kotest#kover
One-click install
npx skills add https://github.com/Jamkris/everything-gemini-code --skill kotlin-testing-jamkris
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: kotlin-testing
Source: https://github.com/Jamkris/everything-gemini-code/tree/main/skills/kotlin-testing
Command: npx skills add https://github.com/Jamkris/everything-gemini-code --skill kotlin-testing-jamkris

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Kotlin testing can be challenging for teams adopting TDD and modern Kotlin tooling. This guide provides a structured set of patterns and examples using Kotest, MockK, coroutine testing, property-based testing, and Kover to help you write reliable, maintainable tests.

Core Features & Use Cases

  • Kotest specs: classic StringSpec, FunSpec, BehaviorSpec, and DescribeSpec styles with practical examples.
  • MockK & coroutines: isolate suspending functions and verify asynchronous interactions in tests.
  • TDD workflow & coverage: follow RED/GREEN/REFACTOR cycles and measure coverage with Kover.
  • Guidance on data-driven and property-based tests: validate logic with random and bound inputs to improve robustness.
  • Use cases: ideal for Kotlin libraries, services, and applications requiring dependable unit tests and clear test semantics.

Quick Start

Apply these patterns by adding a Kotest-based test example to your Kotlin project and running ./gradlew test to verify results.

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 with suspending functions?▼

Kotlin coroutines are tested using the runTest API to isolate suspending functions and verify asynchronous interactions reliably. This approach ensures time-controlled execution for coroutine tests without actual delay.

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

MockK isolates suspending functions and verifies asynchronous interactions in Kotlin unit tests. It provides structured mocking patterns specifically designed for coroutine-based code and suspending function calls.

How do I set up Kotest with Gradle for TDD workflow?▼

Kotest setup with Gradle enables TDD workflow through RED/GREEN/REFACTOR cycles. Add Kotest dependencies to your Gradle build file and run ./gradlew test to verify specifications like StringSpec or FunSpec.

Can I use property-based testing with Kotest for Kotlin projects?▼

Property-based testing with Kotest validates logic using random and bound inputs to improve robustness in Kotlin projects. It generates diverse test data automatically to uncover edge cases missed by traditional tests.

Does Kover measure test coverage for Kotlin projects using Kotest?▼

Kover measures test coverage for Kotlin projects using Kotest to ensure measurable test quality. It integrates with the Gradle build process to generate coverage reports for your TDD workflow.

When should I use BehaviorSpec vs DescribeSpec in Kotest?▼

BehaviorSpec structures tests with Given/When/Then semantics while DescribeSpec uses Describe/It blocks for Kotlin testing. Choose BehaviorSpec for BDD-style clarity and DescribeSpec for nested descriptive contexts.

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