template-context

Extract template conditionals into a testable PORO context class to achieve full branch coverage. Move complex if/unless/ternary statements from ERB templates into isolated Plain Old Ruby Objects, update templates to call context methods, and write unit tests for the PORO.

Your test suite reports 0% branch coverage for template files because complex conditional logic is embedded directly within ERB templates, which standard coverage tools cannot test. Extracting conditionals into a PORO enables isolated unit testing of the decision-making logic.

The best way to refactor complex conditionals out of ERB templates is to create a PORO context class, move if/unless/ternary statements into dedicated methods, and update the template to call context methods, simplifying templates to focus on rendering data.

Yes, you can use a PORO to test Rails generator templates with conditional logic. This pattern applies to scenarios involving the development of Rails generators with conditional ERB templates, allowing you to extract and unit test the template logic.

To write unit tests for ERB template rendering logic, extract the conditional logic into a PORO context class first. You can then write isolated unit tests directly against the PORO methods to verify the decision-making logic and achieve higher code quality.

You should move template conditionals into a separate Ruby object when your templates contain complex if/unless/ternary statements that need branch coverage, or when you want declarative templates that focus on rendering data rather than executing logic.