Add kotlin Testing Frameworks doc

Author: ashtanko

src/test/kotlin/dev/shtanko/TESTING_FRAMEWORKS.md

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+# Kotlin Testing Frameworks
+
+## ✅ Unit Testing & JVM Testing
+### 1. JUnit 5 (Jupiter) - Standard JVM Testing
+- Best for unit and integration tests.
+- Supports annotations like `@Test`, `@BeforeEach`, `@AfterEach`.
+- Works well with Kotest, Mockito, and Spring.
+
+### 2. Kotest (formerly KotlinTest) - Kotlin-native Testing
+- Supports property-based testing, matchers, and coroutines.
+- DSL-style syntax for expressive tests.
+
+### 3. Spek - Specification-based Testing
+Inspired by RSpec (from Ruby).
+
+## ✅ Mocking Libraries
+### 4. Mockito & MockK - Mocking Frameworks
+- Mockito: Java-based, integrates with JUnit 5.
+- MockK: Kotlin-native, better for coroutines and DSL-friendly.
+
+## ✅ Android UI & Instrumentation Testing
+### 5. Espresso - UI Testing for Android
+
+### 6. UIAutomator - System UI Testing
+Used for interactions beyond the app (e.g., system UI, notifications).
+### 7. Compose Testing - Jetpack Compose UI Testing
+
+## ✅ Benchmarking & Performance Testing
+### 8. JMH (Java Microbenchmark Harness) - Benchmark Kotlin Code
+Best for measuring performance of functions and loops.
+Requires annotation processing (kapt).
+
+### 9. Android Benchmark (Jetpack)
+Measures Android performance in native/kotlin code.
+Supports BenchmarkRule and Perfetto.
+
+## ✅Turbine
+Works with kotlinx.coroutines.Flow for testing emissions.
+Eliminates the need for complex collect() calls in tests.
+Supports structured assertions like awaitItem(), expectNoEvents(), and awaitComplete().
+
+### ✅ Turbine vs Standard Flow Testing
+
+| Feature                          | Standard Flow (`collect`) | Turbine |
+|----------------------------------|-----------------|---------|
+| Requires manual `collect()`      | ✅ Yes          | ❌ No  |
+| Assertions are simple            | ❌ No           | ✅ Yes  |
+| Supports awaiting specific items | ❌ No           | ✅ Yes (`awaitItem()`) |
+| Checks for no events             | ❌ No           | ✅ Yes (`expectNoEvents()`) |
+| Supports Flow cancellation       | ❌ No           | ✅ Yes (`cancelAndIgnoreRemainingEvents()`) |
+| Handles delays in Flows          | ❌ No           | ✅ Yes |