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Atomic ObjectJames McConkey7 min readintermediate

Write End-to-End Tests in Your Backend’s Language

Read on atomicobject.com

Summary

This article advocates writing end-to-end tests in the backend's language to leverage domain models and persistence tools for efficient test data setup. It details a strategy for structuring E2E tests with inline data creation, small helpers, and parallel execution considerations.

  • Write E2E tests in the backend's language (e.g., Python Playwright for FastAPI) to access domain models and persistence tools for data setup.
  • Keep test data setup explicit and inline within the test for readability, avoiding overly abstract scenario builders.
  • Build small, focused creation helpers for individual models, committing changes to make data immediately visible to the application.
  • Design tests for parallel execution by using UUIDs for uniqueness, explicit ownership, and filtering queries by workspace/assignment.

Engineers building full-stack applications, especially those owning the backend, will find this useful for structuring robust, maintainable, and fast end-to-end tests.

7/10
devopspythonarchitecturetestinge2e testingplaywright

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