Test Fix

Systematic approach to diagnosing and fixing failing tests.

Process

Step 1: Identify Failing Tests

cargo test --all
cargo test test_name -- --exact --nocapture

Step 2: Reproduce Locally

# With debug logging
RUST_LOG=debug cargo test test_name

# Force single-threaded for race conditions
cargo test test_name -- --test-threads=1

Step 3: Diagnose Root Cause

Pattern	Symptom	Fix
Async/Await	"future cannot be sent"	Add .await, use Arc
Database	"connection refused"	Check env vars, use test DB
Race	Intermittent assertion failure	Add Mutex, sequential execution
Type	"expected X, found Y"	Update signatures, add conversions
Lifetime	"borrowed value"	Clone data, adjust lifetimes

Step 4: Verify Fix

# Run multiple times
for i in {1..10}; do cargo test test_name -- --exact || break; done

# Run full suite
cargo test --all

Step 5: Regression Prevention

Add test for the specific bug that was fixed.

Debugging Checklist

• Run failing test in isolation
• Check environment variables
• Review recent changes
• Check for missing .await
• Verify database connections
• Look for race conditions
• Check type compatibility

Tools

# Debug logging
RUST_LOG=debug cargo test

# Full backtrace
RUST_BACKTRACE=full cargo test

# Specific module
RUST_LOG=memory_core=debug cargo test

When to Skip vs Fix

Skip (temporarily):

• External service down
• Platform-specific issue
• Known upstream bug

Fix immediately:

• Logic error
• Incorrect assertion
• Missing error handling