foxhunt/docs/archive/waves/WAVE_7.6_HOT_SWAP_TEST_FIX.md

Wave 7.6: Hot Swap Automation Test Expectations Fix

Date: 2025-10-15 Status: ✅ COMPLETE Objective: Update hot swap automation tests to match new synchronous "staged+validated" flow

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Problem Statement

Tests were failing with status mismatches after hot swap automation was updated to use synchronous staging+validation:

Expected: "staged"
Actual: "validated"

Root Cause: System now performs synchronous staging and validation in handle_training_complete(), but tests were written for the old asynchronous flow where staging completed first.

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Changes Made

1. Implementation File: /home/jgrusewski/Work/foxhunt/services/trading_service/src/hot_swap_automation.rs

Line 645-648: Updated unit test expectation

// Before:
assert_eq!(status.current_stage, "staged");

// After:
// Status should exist now with validated stage (synchronous validation)
let status = automation.get_status("PPO").await.unwrap();
assert_eq!(status.model_id, "PPO");
assert_eq!(status.current_stage, "validated");

2. Integration Test File: /home/jgrusewski/Work/foxhunt/services/trading_service/tests/hot_swap_automation_tests.rs

Change 1: Fixed test_full_e2e_hot_swap_workflow (Line 550-552)

// Before:
// Step 3: Verify staged
let status = automation.get_status("DQN").await.unwrap();
assert_eq!(status.current_stage, "staged");

// After:
// Step 3: Verify validated (synchronous staging+validation)
let status = automation.get_status("DQN").await.unwrap();
assert_eq!(status.current_stage, "validated");

Change 2: Fixed test_hot_swap_status_tracking (Line 460-485)

Problem: Test was checking status after just registering a model, but status is only created after a training event.

Solution: Added training event trigger to generate status:

// After registering model, trigger training workflow
let new_checkpoint = Arc::new(CheckpointModel::new(
    "DQN".to_string(),
    "checkpoint_v2.safetensors".to_string(),
    create_mock_prediction_fn(),
));

let event = TrainingEvent::new(
    "DQN".to_string(),
    "checkpoint_v2.safetensors".to_string(),
    new_checkpoint,
);

automation.handle_training_complete(event).await.unwrap();

// THEN: Status should be available after training event
let status = automation.get_status("DQN").await;
assert!(status.is_ok());

Change 3: Removed unused imports (Line 15-24)

// Removed:
use uuid::Uuid;
use HotSwapStatus;

// Kept:
use std::sync::Arc;
use std::time::Duration;
use tokio::time::sleep;
use ml::{Features, MLResult, ModelPrediction};
use ml::ensemble::{CheckpointModel, CheckpointValidator, HotSwapManager, RollbackPolicy};
use trading_service::hot_swap_automation::{
    HotSwapAutomation, HotSwapConfig, TrainingEvent, ValidationStatus,
    CanaryStatus,
};

---

System Behavior Analysis

Synchronous Flow (Current Implementation)

handle_training_complete()
    ├─ stage_checkpoint()      → Sets status to "staged"
    └─ validate_checkpoint()   → Sets status to "validated" (SYNCHRONOUS)

Result: Status is "validated" when handle_training_complete() returns

Old Asynchronous Flow (Tests Expected)

handle_training_complete()
    └─ stage_checkpoint()      → Sets status to "staged", returns immediately

validate_checkpoint()          → Runs separately, sets "validated" later

Result: Status was "staged" when handle_training_complete() returned

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Test Status Summary

Fixed Tests (2/4)

1. ✅ test_full_e2e_hot_swap_workflow - Updated status expectation
2. ✅ test_hot_swap_status_tracking - Added training event trigger

Remaining Failures (2/4 - Not Related to Status Mismatch)

3. ⚠️ test_validation_rejects_slow_checkpoint - Validation logic issue (slow function not reliably exceeding P99 threshold)
4. ⚠️ test_canary_passes_and_completes - Canary monitoring timing issue

Note: Tests 3 and 4 are failing due to test logic/timing issues, not status mismatch. These require separate investigation.

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Status Transitions Reference

Training Complete → "staged" → "validating" → "validated"
                                   ↓ (on failure)
                            "validation_failed"

Atomic Swap → "swapped" → "canary_monitoring" → "completed"
                                   ↓ (on failure)
                            "canary_failed" → "rolled_back"

---

Validation Results

✓ Files found
✓ No 'staged' expectations found in tests
✓ Found 3 'validated' expectations
✓ Implementation sets 'validated' status
✓ All validation checks passed!

All Status Assertions:

• Line 82: assert_eq!(status.current_stage, "validated") ✅
• Line 180: assert_eq!(status.current_stage, "validation_failed") ✅
• Line 277: assert_eq!(status.current_stage, "canary_monitoring") ✅
• Line 327: assert_eq!(status.current_stage, "completed") ✅
• Line 435: assert_eq!(status.current_stage, "validated") ✅
• Line 566: assert_eq!(status.current_stage, "validated") ✅
• Line 575: assert_eq!(status.current_stage, "canary_monitoring") ✅
• Line 583: assert_eq!(status.current_stage, "completed") ✅

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Files Modified

1. /home/jgrusewski/Work/foxhunt/services/trading_service/src/hot_swap_automation.rs (+1 line, -1 line)
2. /home/jgrusewski/Work/foxhunt/services/trading_service/tests/hot_swap_automation_tests.rs (+24 lines, -4 lines)

Total Changes: +25 lines, -5 lines (net +20)

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Next Steps

Immediate (Optional - Separate Wave)

1. Investigate test_validation_rejects_slow_checkpoint failure

   • Issue: 100μs sleep might not consistently exceed 200μs P99 threshold
   • Solution: Increase slow function sleep to 300μs for reliable failure

2. Investigate test_canary_passes_and_completes failure

   • Issue: Canary monitoring timing or status update issue
   • Solution: Add debug logging or increase wait time

Long-term

• Consider adding explicit test coverage for synchronous vs async validation modes
• Add integration test for validation timeout scenario
• Document hot swap automation flow in architecture diagrams

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Conclusion

✅ MISSION ACCOMPLISHED

Successfully updated hot swap automation tests to match new synchronous "staged+validated" flow:

• Fixed 2 test failures related to status expectations
• Removed unused imports
• Added comprehensive documentation
• All status assertions now correctly expect "validated" immediately after training completion

Remaining Issues: 2 test failures unrelated to status mismatch (validation logic and canary timing) - these should be addressed in a separate wave focused on test reliability.