kotlin-testing

# Kotlin Testing Patterns Comprehensive Kotlin testing patterns for writing reliable, maintainable tests following TDD methodology with Kotest and MockK. ## When to Use - Writing new Kotlin functions or classes - Adding test coverage to existing Kotlin code - Implementing property-based tests - Following TDD workflow in Kotlin projects - Configuring Kover for code coverage ## How It Works 1. **Identify target code** — Find the function, class, or module to test 2. **Write a Kotest spec** — Choose a spec style (StringSpec, FunSpec, BehaviorSpec) matching the test scope 3. **Mock dependencies** — Use MockK to isolate the unit under test 4. **Run tests (RED)** — Verify the test fails with the expected error 5. **Implement code (GREEN)** — Write minimal code to pass the test 6. **Refactor** — Improve the implementation while keeping tests green 7. **Check coverage** — Run `./gradlew koverHtmlReport` and verify 80%+ coverage ## Examples The following sections contain detailed, runnable examples for each testing pattern: ### Quick Reference - **Kotest specs** — StringSpec, FunSpec, BehaviorSpec, DescribeSpec examples in [Kotest Spec Styles](#kotest-spec-styles) - **Mocking** — MockK setup, coroutine mocking, argument capture in [MockK](#mockk) - **TDD walkthrough** — Full RED/GREEN/REFACTOR cycle with EmailValidator in [TDD Workflow for Kotlin](#tdd-workflow-for-kotlin) - **Coverage** — Kover configuration and commands in [Kover Coverage](#kover-coverage) - **Ktor testing*...