When to Replace Instance Variables with let and let! in RSpec
Replace hidden instance-variable dependencies in RSpec before hooks with let and let!. Make setup explicit, lazy where possible, and isolated so failures point to the example.
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rspec
rubyReducing RSpec Duplication with Shared Examples: A Practical Guide
Define a contract once with RSpec shared examples and reuse it across example groups — including parameterization, it_behaves_like vs. include_examples, and the traps to avoid.
pytest