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TDD_RULES.md

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+# TDD Development Rules
+
+This document outlines the rules for Test-Driven Development (TDD) using pytest within our containerized environment.
+
+## Principles
+
+- **Test-First Approach**: All new features must begin with writing a failing test.
+- **Debug-Driven Tests**: When a bug is identified during debugging, a new pytest must be created to reproduce the bug and validate its fix.
+
+## Pytest Execution
+
+Pytest should be run within the Docker Compose environment to ensure consistency and isolation.
+
+### Running Specific Tests
+
+To run tests for a specific file:
+
+```bash
+docker compose build
+docker compose run --remove-orphans foodtracker pytest tests/<test filename>
+```
+
+### Running All Tests
+
+To run all tests in the project:
+
+```bash
+docker compose build
+docker compose run --remove-orphans foodtracker pytest