Unit Tests, Mock HTTP & UI Tests in Kotlin Compose Desktop | Lesson 15 скачать в хорошем качестве

Unit Tests, Mock HTTP & UI Tests in Kotlin Compose Desktop | Lesson 15

Learn how to test Kotlin Compose Desktop applications! We refactor a weather app for testability with injectable HttpClient, add pure functions, and write 16 tests covering unit tests, Ktor MockEngine API mocking, and Compose UI tests with createComposeRule. What You'll Learn: Setting up test dependencies: compose.desktop.uiTestJUnit4, ktor-client-mock, coroutines-test Refactoring for testability: injectable HttpClient parameter instead of global client Pure functions for easy unit testing (weatherDescription WMO code mapping) @Serializable data class deserialization tests with kotlinx-serialization Ktor MockEngine for controlled HTTP responses without hitting real APIs Compose UI testing with createComposeRule() and JUnit4 onNodeWithTag / onNodeWithText for querying the semantic tree Modifier.testTag("id") for stable UI test selectors assertTextEquals, assertTextContains, assertExists for UI assertions waitUntil for async operations in UI tests Testing error states with mock server errors Timestamps: 0:00 - Introduction 0:15 - Preview: 16 Tests Across 3 Files 0:45 - Project Setup (Gradle with Test Dependencies) 2:48 - Weather Models & API (Refactored for Testability) 5:03 - App Content & Main (with testTag Modifiers) 9:27 - Unit Tests (WeatherModelsTest + WeatherApiTest) 14:18 - UI Tests (AppContentTest with Compose Rules) 17:51 - Run Tests (Compile + ./gradlew test + Results) 19:33 - Live Demo: Weather App in Action 20:13 - Recap & Key Takeaways 21:13 - Thanks for Watching Key Takeaways: 1. Test Setup — compose.desktop.uiTestJUnit4 + kotlin("test") for desktop UI and unit tests 2. Unit Tests — Test pure functions and serialization with @Test and assertEquals 3. Mock HTTP — Ktor MockEngine replaces real API calls with controlled responses 4. UI Tests — createComposeRule() + onNodeWithTag for composable assertions 5. Test Tags — Modifier.testTag("id") gives stable selectors for UI test queries Previous Lesson: Lesson 14: Tables & Data Grids — Data Explorer    / .  . Next Lesson: Lesson 16: Packaging & Distribution (coming soon) Tech Stack: Kotlin 2.1, Compose Multiplatform 1.7.3, Material3 Ktor 3.0.3, Ktor MockEngine, kotlinx-serialization 1.7.3 JUnit4, kotlinx-coroutines-test 1.9.0 Gradle 8.10, JVM 17+ Source Code: https://github.com/GoCelesteAI/kotlin... Taught by CelesteAI If you found this helpful, please like and subscribe for more Kotlin Desktop tutorials! #kotlin #compose #desktop #material3 #testing #junit #mockengine #ktor #unittests #uitests #tutorial #programming