Painfully Simple Test Case Mistakes That Are Easy to Fix - FastRuby.io

Common test case mistakes in Rails applications and how to fix them. Covers four key issues: insufficient assertions (only checking response status instead of side effects like emails and DB records), testing only happy paths while ignoring failure scenarios, cramming multiple scenarios into a single test case causing state dependencies and unclear failures, and writing vague test descriptions. Also introduces mutation testing as a technique to verify test strength, mentioning the Mutant gem for Ruby.

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