refactor: implement dynamic edge case tests with improved organization (#3)

- Split integration tests into focused test files (basic_filter_tests.rs, edge_case_tests.rs)
- Replace static test data with dynamic generation based on current time
- Add comprehensive boundary testing for 7-day and 90-day filtering rules
- Implement self-documenting test cases with clear business rule descriptions
- Enhance test output formatting with aligned columns for better
- readability

Author: JohnBasrai

CHANGELOG.md

@@ -8,6 +8,20 @@ The format follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and
 
 ## [Unreleased]
 
+### Changed
+- **Test Organization**: Split integration tests into focused test files
+  - `tests/basic_filter_tests.rs` - Core integration tests with static test data
+  - `tests/edge_case_tests.rs` - Dynamic boundary condition tests
+- **Test Infrastructure Enhancement**: Implemented dynamic test data generation
+  - Added comprehensive boundary testing for time-based filtering rules
+  - Self-documenting test cases with clear business rule descriptions
+- **Enhanced Test Reporting**: Added aligned, formatted test output for better readability
+
+### Technical
+- Improved test maintainability with descriptive entity names and test descriptions
+
+---
+
 ## [0.2.0] – 2025-06-28
 
 ### Added

README.md

@@ -29,7 +29,8 @@ src/
 ├── main.rs             ← Lambda entry point & business logic  
 ├── domain.rs           ← Domain entities (Action, Priority)
 tests/
-├── integration_tests.rs ← End-to-end lambda testing
+├── basic_filter_tests.rs ← Core integration tests with static data  
+├── edge_case_tests.rs    ← Dynamic boundary condition tests
 testdata/
 ├── *.json              ← Test input files
 scripts/
@@ -82,17 +83,38 @@ The Lambda applies these filtering and processing rules:
 - Deduplication behavior with priority conflicts
 - Date parsing and filtering logic
 
-### Integration Tests (`tests/integration_tests.rs`)
+### Integration Tests
+
+**Basic Integration Tests (`tests/basic_filter_tests.rs`)**
 - **Real lambda execution** using `cargo lambda invoke`
 - **End-to-end validation** from JSON input to JSON output
 - **Error handling** verification (invalid enum variants)
 - **Order-agnostic testing** for robust HashMap-based results
 
+**Dynamic Edge Case Tests (`tests/edge_case_tests.rs`)**
+- **Boundary condition testing** with dynamic test data generation
+- **Comprehensive business rule validation** (7-day/90-day boundaries)
+- **Self-documenting test cases** with clear descriptions
+- **Time-independent testing** that works regardless of execution date
+
 **Test Data Files:**
 - `01_sample-input.json` - Basic filtering and deduplication
 - `02_priority-input.json` - Priority sorting validation  
 - `03_bad-input.json` - Error handling (invalid priority variant)
-- `04_edge-cases.json` - Boundary conditions and complex scenarios
+
+### Running Tests
+
+```bash
+# Run all tests
+cargo test
+
+# Run specific test suites
+cargo test --test basic_filter_tests    # Basic integration tests
+cargo test --test edge_case_tests       # Dynamic edge case tests
+
+# Run unit tests only
+cargo test --lib
+```
 
 ## 🚀 Usage
 

testdata/04_edge-cases.json

@@ -177,100 +177,6 @@ fn test_bad_input_integration() -> Result<()> {
     Ok(())
 }
 
-#[test]
-fn test_edge_case_filtering() -> Result<()> {
-    // ---
-    // Test edge cases around the 7-day and 90-day boundaries, plus deduplication
-    let actions = run_lambda_invoke("testdata/04_edge-cases.json")?;
-
-    // Based on the test data (assuming current date around 2025-06-27):
-    // - exactly_7_days: last_action 2025-06-20 (exactly 7 days ago) -> SHOULD PASS
-    // - exactly_90_days: next_action 2025-09-25 (exactly 90 days away) -> SHOULD PASS
-    // - just_over_7_days: last_action 2025-06-19 (8 days ago) -> SHOULD PASS
-    // - just_under_90_days: next_action 2025-09-24 (89 days away) -> SHOULD PASS
-    // - duplicate_entity (urgent): first occurrence -> SHOULD BE DEDUPLICATED OUT
-    // - duplicate_entity (normal): second occurrence -> SHOULD PASS (last one wins)
-    // - too_recent: last_action 2025-06-21 (6 days ago) -> SHOULD BE FILTERED OUT
-    // - too_far_future: next_action 2025-09-26 (exactly 90 days away) -> SHOULD PASS
-
-    // We expect 6 actions after filtering and deduplication:
-    // 8 input - 1 too_recent (filtered) - 1 duplicate removed = 6
-    ensure!(
-        actions.len() == 6,
-        "Expected 6 actions to pass edge case filters, got {}",
-        actions.len()
-    );
-
-    // Verify the specific actions that should pass
-    let entity_ids: Vec<&String> = actions.iter().map(|a| &a.entity_id).collect();
-    let expected_ids = vec![
-        "exactly_7_days",
-        "exactly_90_days",
-        "just_over_7_days",
-        "just_under_90_days",
-        "duplicate_entity",
-        "too_far_future", // <-- included because it's exactly 90 days and code uses `<=`
-    ];
-
-    for expected_id in &expected_ids {
-        ensure!(
-            entity_ids.iter().any(|id| id == expected_id),
-            "Expected to find entity_id '{}' in results, but didn't",
-            expected_id
-        );
-    }
-
-    // Verify the filtered out actions are not present
-    let filtered_ids = vec!["too_recent"];
-    for filtered_id in &filtered_ids {
-        ensure!(
-            !entity_ids.iter().any(|id| id == filtered_id),
-            "Expected entity_id '{}' to be filtered out, but found it in results",
-            filtered_id
-        );
-    }
-
-    // Verify deduplication: duplicate_entity should appear exactly once
-    let duplicate_count = entity_ids.iter().filter(|&id| *id == "duplicate_entity").count();
-    ensure!(
-        duplicate_count == 1,
-        "Expected exactly 1 occurrence of 'duplicate_entity', found {}",
-        duplicate_count
-    );
-
-    // Verify that the duplicate_entity kept the LAST occurrence (normal priority)
-    let duplicate_action = actions.iter().find(|a| a.entity_id == "duplicate_entity").unwrap();
-    ensure!(
-        duplicate_action.priority == Priority::Normal,
-        "Expected duplicate_entity to keep the last occurrence (normal), but got {:?}",
-        duplicate_action.priority
-    );
-
-    // Verify priority sorting (urgent before normal)
-    let mut seen_normal = false;
-    for action in &actions {
-        if action.priority == Priority::Normal {
-            seen_normal = true;
-        } else if action.priority == Priority::Urgent && seen_normal {
-            panic!("Found urgent priority after normal priority - sorting is incorrect");
-        }
-    }
-
-    println!("Edge case filtering test passed:");
-    println!("  {} actions passed the time filters", actions.len());
-    println!("  Deduplication verified: duplicate_entity kept last occurrence (normal)");
-    for (i, action) in actions.iter().enumerate() {
-        println!(
-            "  {}. {} ({})",
-            i + 1,
-            action.entity_id,
-            if action.priority == Priority::Urgent { "urgent" } else { "normal" }
-        );
-    }
-
-    Ok(())
-}
-
 #[test]
 fn test_empty_input_array() -> Result<()> {
     // ---