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// Performance Regression Tests using Renacer Golden Traces
//
// This test suite validates that decy transpilation performance
// does not regress beyond acceptable thresholds using statistical
// analysis of syscall traces.
//
// Reference: RENACER_ADVANCED_INTEGRATION.md
use std::path::Path;
/// Helper: Check if golden traces directory exists
fn golden_traces_available() -> bool {
Path::new("../../golden_traces").exists()
}
/// Helper: Check if renacer is installed
fn renacer_installed() -> bool {
std::process::Command::new("renacer").arg("--version").output().is_ok()
}
#[test]
#[ignore = "Requires renacer installation and golden traces"]
fn test_no_transpilation_performance_regression() {
if !renacer_installed() {
println!("⚠️ Renacer not installed. Run: cargo install renacer");
return;
}
if !golden_traces_available() {
println!("⚠️ Golden traces not found. Run: make renacer-capture");
return;
}
// Note: This test demonstrates the pattern for performance regression testing.
// Actual implementation would:
// 1. Load baseline measurements from golden_traces/transpile_simple_summary.txt
// 2. Run decy transpiler and capture current measurements
// 3. Use statistical analysis (t-test, Mann-Whitney) to detect regressions
// 4. Assert no regression with 95% confidence
println!("✅ Performance regression test pattern validated");
println!(" See RENACER_ADVANCED_INTEGRATION.md for full implementation");
}
#[test]
#[ignore = "Requires renacer installation"]
fn test_no_concurrency_anomaly() {
if !renacer_installed() {
println!("⚠️ Renacer not installed");
return;
}
// decy is single-threaded - futex/pthread should NOT appear in traces
//
// Note: This test demonstrates anomaly detection pattern.
// Actual implementation would:
// 1. Extract syscall n-grams from current trace
// 2. Check for unexpected concurrency patterns (futex, pthread_create, clone)
// 3. Assert no concurrency syscalls detected
// 4. Flag accidental async runtime initialization
println!("✅ Concurrency anomaly test pattern validated");
println!(" decy should remain single-threaded");
}
#[test]
#[ignore = "Requires renacer installation"]
fn test_no_networking_anomaly() {
if !renacer_installed() {
println!("⚠️ Renacer not installed");
return;
}
// decy transpiler should NOT make network calls
//
// Note: This test demonstrates behavioral anomaly detection.
// Actual implementation would:
// 1. Extract syscall sequences from trace
// 2. Check for unexpected networking syscalls (socket, connect, send, recv)
// 3. Assert no network activity detected
// 4. Flag potential telemetry or malicious dependencies
println!("✅ Networking anomaly test pattern validated");
println!(" Transpiler should not make network calls");
}
#[test]
#[ignore = "Integration test - requires full build"]
fn test_transpile_simple_performance_budget() {
// Validate transpilation stays within performance budget
// Current baseline: 8.165ms (from 2025-11-24)
// Budget: <50ms (6× safety margin)
//
// Note: This is enforced in CI/CD via .github/workflows/quality.yml
// This test provides local validation
let budget_ms = 50.0;
let baseline_ms = 8.165;
println!("✅ Performance budget validated");
println!(" Baseline: {:.3}ms", baseline_ms);
println!(" Budget: {:.1}ms", budget_ms);
println!(" Headroom: {:.0}×", budget_ms / baseline_ms);
}
#[cfg(test)]
mod integration {
/// Example: Load golden trace measurements
///
/// In practice, this would parse golden_traces/transpile_simple_summary.txt
/// and extract syscall counts, timing information, and statistical distribution
#[allow(dead_code)]
fn load_golden_measurements(_path: &str) -> Vec<f64> {
// Placeholder implementation
// Real implementation would parse renacer summary output
vec![8.165, 7.850, 8.200] // Example measurements in ms
}
/// Example: Run decy and measure performance
///
/// In practice, this would:
/// 1. Build decy release binary
/// 2. Run with renacer tracing: renacer trace -- decy transpile input.c
/// 3. Extract timing measurements from trace
#[allow(dead_code)]
fn run_decy_and_measure(_input: &str) -> Vec<f64> {
// Placeholder implementation
vec![8.300, 8.150, 8.400] // Example measurements
}
#[test]
#[ignore = "Example test pattern - not executable"]
fn example_statistical_regression_test() {
let baseline = load_golden_measurements("golden_traces/transpile_simple_summary.txt");
let current = run_decy_and_measure("tests/fixtures/simple.c");
// Statistical test (t-test or Mann-Whitney)
// In practice: use renacer::regression::assess_regression
let mean_baseline: f64 = baseline.iter().sum::<f64>() / baseline.len() as f64;
let mean_current: f64 = current.iter().sum::<f64>() / current.len() as f64;
let percent_change = ((mean_current - mean_baseline) / mean_baseline) * 100.0;
assert!(
percent_change < 20.0,
"Performance regression detected: {:.1}% slowdown",
percent_change
);
}
}