Meet Duck Typer: your new duck typing friend
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duck_typer is a new Ruby gem from Thoughtbot that enforces duck-typed interfaces through tests without requiring type annotations. It provides test helpers (for both Minitest and RSpec) that compare the public method signatures of multiple classes, catching missing methods, signature drift, and mismatched keyword arguments. You can check full or partial interfaces, name them, target class methods, and even auto-discover classes by namespace so new implementations are automatically validated.
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The interface is a living documentEnforcing an interfaceThe duck_typer gemBonus featureLimitationsConclusionIf you enjoyed this post, you might also like:1.1K Impressions