Akka and Distributed Systems

1. Testing Akka Applications
   1. Testing Fundamentals
      1. Testing Philosophy
      2. Test Structure
      3. Test Isolation
      4. Test Data Management
   2. Actor Testing
      1. TestKit Framework
         1. TestKit Setup
         2. Test Actor System
         3. Test Lifecycle
      2. Test Probes
         1. Message Interception
         2. Behavior Verification
         3. Timing Control
      3. Message Expectations
         1. ExpectMsg Variants
         2. Timeout Configuration
         3. Message Ordering
      4. Actor Hierarchy Testing
         1. Parent-Child Testing
         2. Supervision Testing
         3. Failure Simulation
   3. Asynchronous Testing
      1. Future Testing
         1. ScalaTest Integration
         2. Async Test Support
      2. Eventually Assertions
      3. Timeout Handling
   4. Stream Testing
      1. Stream TestKit
         1. Source Testing
         2. Sink Testing
         3. Flow Testing
      2. Test Sources and Sinks
      3. Materialized Value Testing
      4. Back-Pressure Testing
   5. HTTP Testing
      1. Route Testing
         1. Request Simulation
         2. Response Verification
      2. Server Testing
      3. Client Testing
      4. WebSocket Testing
   6. Persistence Testing
      1. Event Sourcing Tests
      2. Journal Testing
      3. Snapshot Testing
      4. Recovery Testing
   7. Cluster Testing
      1. Multi-Node Testing
         1. Test Cluster Setup
         2. Node Coordination
         3. Failure Simulation
      2. Cluster State Verification
      3. Sharding Tests
      4. Split Brain Testing
   8. Performance Testing
      1. Load Testing
      2. Stress Testing
      3. Throughput Measurement
      4. Latency Analysis