Practice: testing, building a feature, migrating

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The theory is done. In this stage you write tests for each layer, build one feature end to end from scratch, migrate an existing messy screen into layers, and learn when to stop.

1. Testing each layer: the strategy

testingarchitectureriverpod

2. Fakes vs mocks: practice with mocktail

testingmocktailfakes

3. A feature from scratch: service → repository → notifier → view

practiceprojectriverpod

4. Migrating an existing messy screen into layers

practicerefactoringmigration

5. The over-engineering boundary: when to simplify

architecturetrade-offspragmatism

6. Modularisation: packages and melos

architecturepackagesmelosmonorepo