Designing Robust k6 Performance Suites

Building robust k6 performance suites means treating them as long-lived assets, not one-off experiments. This involves good structure, validation practices, documentation and a clear evolution path.

Structuring and Validating k6 Suites #

A typical suite organises scripts by domain or journey, shares common helpers and configuration, and includes smoke, load and stress variants. Validation includes unit-like tests for helper functions, small-scale k6 runs to confirm correctness, and reviews of thresholds and metrics.

Example repository structure:
- tests/
  - helpers/
    - httpClient.js
    - auth.js
  - scenarios/
    - browse.js
    - checkout_smoke.js
    - checkout_load.js
    - checkout_stress.js
  - config/
    - staging.env
    - perf.env

Over time, robust suites become a central part of release readiness and capacity planning discussions.

Common Mistakes #

Mistake 1 — Keeping all logic in a few giant scripts #

This complicates maintenance.

❌ Wrong: No separation between helpers, config and scenarios.

✅ Correct: Break out shared code and use clear naming conventions.

Mistake 2 — Never revisiting thresholds or scenarios #

This freezes assumptions.

❌ Wrong: Keeping old limits even as system and usage evolve.

✅ Correct: Review and adjust suites periodically based on new data.