Fix & Validation

Validation ensures fixes work, don’t introduce regressions, and prevent recurrence.

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Validation process

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1. Functional validation

Verify the fix works:

• Fixes the original problem
• Behaves as expected
• Handles edge cases
• Handles error paths correctly

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2. Regression testing

Ensure no new issues:

• Existing functionality still works
• Related features still work
• Performance is acceptable
• Compatible with other systems

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3. Performance validation

Verify performance impact:

• Response time acceptable
• Resource usage reasonable
• Handles expected load
• Scales appropriately

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4. Production validation

Validate in production:

• Roll out gradually if possible
• Monitor closely after deployment
• Have rollback plan ready
• Define success criteria

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Example

Fix: Fixed connection leak in OrderRepository Validation:

1. Functional: Error handling paths tested, connections released properly
2. Regression: Existing queries work, no performance degradation
3. Performance: Handles expected load, resource usage acceptable
4. Production: Gradual rollout 10% → 50% → 100%, monitoring confirms success

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Validation levels

• Unit — Individual components
• Integration — Component interactions
• System — Full system workflows
• Production — Live production environment

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Best practices

• Test thoroughly before deploying
• Automate tests where possible
• Define clear success criteria
• Monitor closely after deployment
• Have rollback plan ready

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Validation checklist

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Pre-deployment

• Fix implemented correctly
• Unit tests pass
• Integration tests pass
• Code review completed
• Documentation updated

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Deployment

• Rollback plan ready
• Monitoring configured
• Team notified
• Gradual rollout planned

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Post-deployment

• Production monitoring active
• No errors observed
• Performance acceptable
• User impact positive
• Validation complete