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Tests must properly clean up resources and handle conditional execution regardless of test outcome. This includes removing temporary files, resetting global state, and gracefully handling feature flag conditions.

For file-based tests, use RAII patterns or explicit cleanup in finally blocks to ensure resources are released even when tests fail:

KJ_TEST("PerfettoSession basic functionality") {
  auto traceFile = getTempFileName("perfetto-test");
  
  // Use RAII or try-finally pattern
  KJ_DEFER(removeFile(traceFile.cStr()));
  
  {
    PerfettoSession session(traceFile, "workerd");
    // ... test operations
  }
  
  KJ_ASSERT(fileExists(traceFile.cStr()));
  // File automatically cleaned up by KJ_DEFER
}

For tests that depend on feature flags or autogates, check conditions early and skip gracefully rather than creating complex conditional logic:

KJ_TEST("feature dependent test") {
  if (util::Autogate::isEnabled("feature-flag")) {
    KJ_LOG(INFO, "Skipping test due to autogate being enabled");
    return;
  }
  
  // ... rest of test
}

This prevents resource leaks, reduces flaky tests, and makes test behavior predictable across different environments and configurations.