Test Runner

Execute and manage Rust tests for the self-learning memory project.

Test Categories

Execution Strategy

Step 1: Quick Check (Unit Tests)

cargo nextest run --lib

• Fast feedback (< 30s), per-test process isolation
• Catch basic logic errors

Step 2: Integration Tests

cargo nextest run --test '*'

• Tests database interactions
• Requires Turso/redb setup

Step 3: Full Suite

cargo nextest run --all
cargo test --doc  # doctests separately (nextest limitation)

• Complete validation before commit

Step 4: Mutation Testing (Periodic)

cargo mutants -p memory-core --timeout 120 --jobs 4 -- --lib

• Verifies test suite catches real bugs
• Run nightly or before releases (ADR-033)

Troubleshooting

Async/Await Issues

Symptom: Test hangs

#[tokio::test]
async fn test_async() {
    let result = async_fn().await;  // Don't forget .await
}

Database Connection

Symptom: Connection refused

• Check TURSO_URL, TURSO_TOKEN
• Use test database

Race Conditions

Symptom: Intermittent failures

cargo test -- --test-threads=1

redb Lock Errors

Symptom: “Database is locked”

• Use separate DB per test
• Close transactions promptly

Coverage

cargo install cargo-llvm-cov
cargo llvm-cov --html --output-dir coverage

Best Practices

• Isolation: Each test independent
• Cleanup: Remove test data
• Speed: < 1s per unit test
• Naming: test_<function>_<scenario>_<expected>
• AAA pattern: Arrange-Act-Assert in every test
• Single responsibility: Each test verifies ONE behavior

Advanced: Async Testing Patterns

// Time-based testing (paused clock)
#[tokio::test(start_paused = true)]
async fn test_timeout_behavior() {
    let start = tokio::time::Instant::now();
    tokio::time::sleep(Duration::from_secs(5)).await;
    assert!(start.elapsed().as_millis() < 100);
}

// Concurrent operations
#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
async fn test_concurrent_episodes() {
    let memory = Arc::new(setup_memory().await);
    let handles: Vec<_> = (0..10).map(|i| {
        let mem = memory.clone();
        tokio::spawn(async move {
            mem.start_episode(format!("Task {}", i), ctx, type_).await
        })
    }).collect();
    let results = futures::future::join_all(handles).await;
    assert_eq!(results.len(), 10);
}

Common Async Pitfalls

nextest Profiles (.config/nextest.toml)

[profile.default]
retries = 0
slow-timeout = { period = "60s", terminate-after = 2 }
fail-fast = false

[profile.ci]
retries = 2
slow-timeout = { period = "30s", terminate-after = 3 }
failure-output = "immediate-final"
junit.path = "target/nextest/ci/junit.xml"

[profile.nightly]
retries = 3
slow-timeout = { period = "120s", terminate-after = 2 }

cargo nextest run                  # default profile
cargo nextest run --profile ci     # CI with retries + JUnit
cargo nextest run --profile nightly  # nightly with extended timeouts

Snapshot Testing (insta)

#[test]
fn test_mcp_tool_response() {
    let response = build_tool_response("search_patterns", &params);
    insta::assert_json_snapshot!(response);
}

cargo insta test     # run snapshot tests
cargo insta review   # accept/reject changes

Property-Based Testing

proptest! {
    #[test]
    fn test_episode_id_uniqueness(
        tasks in prop::collection::vec(any::<String>(), 1..100)
    ) {
        let rt = tokio::runtime::Runtime::new().unwrap();
        rt.block_on(async {
            let memory = setup_memory().await;
            let mut ids = HashSet::new();
            for desc in tasks {
                let id = memory.start_episode(desc, ctx, type_).await;
                prop_assert!(ids.insert(id));
            }
        });
    }
}

Advanced: Episodic Memory Testing

#[tokio::test]
async fn test_complete_episode_lifecycle() {
    let memory = setup_memory().await;
    let id = memory.start_episode("Test task", ctx, TaskType::CodeGen).await;
    memory.log_execution_step(id.clone(), step1).await;
    memory.complete_episode(id.clone(), TaskOutcome::Success, None).await?;
    let episode = memory.get_episode(&id).await?;
    assert_eq!(episode.outcome, TaskOutcome::Success);
}

Performance Targets

References

• ADR-033: Modern Testing Strategy
• TESTING.md — Full testing guide

Consolidated from these former skills (preserved in _consolidated/):

• test-optimization — cargo-nextest, property testing, benchmarking
• quality-unit-testing — AAA pattern, naming conventions, test quality
• rust-async-testing — tokio test patterns, time-based testing
• episodic-memory-testing — episode lifecycle, pattern extraction, reward scoring tests