# Symfonytest Doubles Mocking > Drive Symfony delivery with deterministic tests and strong regression protection. Use for test doubles mocking tasks. Use when this capability is needed. - Skill: `tomevault-io/symfonytest-doubles-mocking` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/symfonytest-doubles-mocking` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/symfonytest-doubles-mocking/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/symfonytest-doubles-mocking --- # Test Doubles Mocking (Symfony) ## Use when - Building regression-safe behavior with TDD/functional/e2e tests. - Converting bug reports into executable failing tests. ## Default workflow 1. Write failing test for target behavior and one boundary case. 2. Implement minimal code to pass. 2. Refactor while preserving green suite. 2. Broaden coverage for invalid/unauthorized/not-found paths. ## Guardrails - Prefer deterministic fixtures/builders. - Assert observable behavior, not internal implementation. - Keep tests isolated and stable in CI. ## Progressive disclosure - Use this file for execution posture and risk controls. - Open references when deep implementation details are needed. ## Output contract - RED/GREEN/REFACTOR trace. - Test files changed and executed commands. - Coverage and confidence notes. ## References - `reference.md` - `docs/complexity-tiers.md` --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/makfly) — claim your Tome and manage your conversions.