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django-forms-validation-tdd

Test-drive Django validation across model constraints, forms, ModelForms, views, template errors, duplicate handling, and redirects. Use when adding or refactoring Django forms, surfacing validation errors, deciding model-vs-form-vs-view responsibility, or preventing invalid input from being saved.

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# Django Forms Validation TDD

Use this skill to place validation tests at the layer that owns the rule, then prove the user-facing error path still works. Django validation often crosses model, form, view, and template boundaries; keep those responsibilities explicit.

## Source Traceability

Primary source: Harry Percival, *Test-Driven Development with Python*, 3rd ed. Guidance is transformed and paraphrased from chapters 14-16 and Appendix A, especially model constraints, form validation, ModelForm tradeoffs, view-level error surfacing, and duplicate item handling.

## Workflow

1. Classify the validation rule.
   - Data integrity belongs near the model or database constraint.
   - User input shape and presentation belong in a form.
   - Request branching and redirects belong in the view.