fix: Resolve compilation issues and add comprehensive TestQueue documentation

## Examples Compilation Fixes
- Add missing example configurations in Cargo.toml with proper feature requirements
- Fix database pool setup with conditional compilation in autoscaling_example.rs
- Replace generic function signatures with concrete types using type aliases in retry_strategies.rs
- Fix job priority methods (.with_priority() instead of .as_high())
- Fix batch creation using .with_jobs() builder pattern
- Fix workflow creation using .add_job() chain and .depends_on() for dependencies
- Fix cron expressions to use 6-field format (including seconds)
- Fix field access for QueueStats (use .statistics.completed instead of .completed)
- Remove Worker usage from TestQueue example with proper documentation of incompatibility

## TestQueue Documentation & Testing
- Add comprehensive docs/testing.md with complete TestQueue usage guide
- Document TestQueue limitations: designed for testing job logic, not Worker functionality
- Add extensive examples for delayed jobs, cron jobs, priorities, batches, workflows
- Fix test_cron_job test failure by advancing MockClock before dequeuing cron jobs
- Add TestQueue feature to README with examples and documentation links

## Key Features Added
- Complete TestQueue documentation with 400+ lines of usage examples
- Clear separation of concerns: TestQueue for job logic, real databases for Worker testing
- Best practices guide for effective TestQueue usage in unit tests
- All 187 unit tests, 150 doctests, and integration tests now passing

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: CodingAnarchy

Cargo.toml

@@ -112,3 +112,27 @@ required-features = ["postgres"]
 name = "priority_example"
 required-features = ["postgres"]
 
+[[example]]
+name = "batch_example"
+required-features = ["postgres"]
+
+[[example]]
+name = "worker_batch_example"
+required-features = ["postgres"]
+
+[[example]]
+name = "retry_strategies"
+required-features = ["postgres"]
+
+[[example]]
+name = "result_storage_example"
+required-features = ["postgres"]
+
+[[example]]
+name = "autoscaling_example"
+required-features = ["postgres"]
+
+[[example]]
+name = "test_queue_example"
+required-features = ["test"]
+

README.md

@@ -5,6 +5,7 @@ A high-performance, database-driven job queue for Rust with comprehensive featur
 ## Features
 
 - **📊 Web Dashboard**: Modern real-time web interface for monitoring queues, managing jobs, and system administration with authentication and WebSocket updates
+- **🧪 TestQueue Framework**: Complete in-memory testing implementation with MockClock for deterministic testing of time-dependent features, workflows, and job processing
 - **🔍 Job Tracing & Correlation**: Comprehensive distributed tracing with OpenTelemetry integration, trace IDs, correlation IDs, and lifecycle event hooks
 - **🔗 Job Dependencies & Workflows**: Create complex data processing pipelines with job dependencies, sequential chains, and parallel processing with synchronization barriers
 - **Multi-database support**: PostgreSQL and MySQL backends with optimized dependency queries
@@ -39,7 +40,7 @@ hammerwork = { version = "1.2", features = ["postgres", "tracing"] }
 hammerwork = { version = "1.2", features = ["postgres"], default-features = false }
 ```
 
-**Feature Flags**: `postgres`, `mysql`, `metrics` (default), `alerting` (default), `tracing` (optional)
+**Feature Flags**: `postgres`, `mysql`, `metrics` (default), `alerting` (default), `tracing` (optional), `test` (for TestQueue)
 
 ### Web Dashboard (Optional)
 
@@ -66,6 +67,7 @@ See the [Quick Start Guide](docs/quick-start.md) for complete examples with Post
 ## Documentation
 
 - **[Quick Start Guide](docs/quick-start.md)** - Get started with PostgreSQL and MySQL
+- **[TestQueue Framework](docs/testing.md)** - In-memory testing with MockClock for unit tests and time control
 - **[Web Dashboard](hammerwork-web/README.md)** - Real-time web interface for queue monitoring and job management
 - **[Job Tracing & Correlation](docs/tracing.md)** - Distributed tracing, correlation IDs, and OpenTelemetry integration
 - **[Job Dependencies & Workflows](docs/workflows.md)** - Complex pipelines, job dependencies, and orchestration
@@ -230,6 +232,49 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
 This enables end-to-end tracing across your entire job processing pipeline with automatic span creation, correlation tracking, and integration with observability platforms like Jaeger, Zipkin, or DataDog.
 
+## Testing Example
+
+Test your job processing logic with the in-memory `TestQueue` framework:
+
+```rust
+use hammerwork::queue::test::{TestQueue, MockClock};
+use hammerwork::{Job, JobStatus, queue::DatabaseQueue};
+use serde_json::json;
+use chrono::Duration;
+
+#[tokio::test]
+async fn test_delayed_job_processing() {
+    let clock = MockClock::new();
+    let queue = TestQueue::with_clock(clock.clone());
+    
+    // Schedule a job for 1 hour from now
+    let future_time = clock.now() + Duration::hours(1);
+    let job = Job::new("test_queue".to_string(), json!({"task": "delayed_task"}))
+        .with_scheduled_at(future_time);
+    
+    let job_id = queue.enqueue(job).await.unwrap();
+    
+    // Job shouldn't be available immediately
+    assert!(queue.dequeue("test_queue").await.unwrap().is_none());
+    
+    // Advance time past scheduled time
+    clock.advance(Duration::hours(2));
+    
+    // Now job should be available for processing
+    let dequeued = queue.dequeue("test_queue").await.unwrap().unwrap();
+    assert_eq!(dequeued.id, job_id);
+    
+    // Complete the job
+    queue.complete_job(job_id).await.unwrap();
+    
+    // Verify completion
+    let completed = queue.get_job(job_id).await.unwrap().unwrap();
+    assert_eq!(completed.status, JobStatus::Completed);
+}
+```
+
+The `TestQueue` provides complete compatibility with the `DatabaseQueue` trait while offering deterministic time control through `MockClock`, making it perfect for testing complex workflows, retry logic, and time-dependent job processing.
+
 ## Web Dashboard
 
 Start the real-time web dashboard for monitoring and managing your job queues: