Testing JavaScript with Jest on Vultr | MDN Blog
Briefly

Jest's comprehensive matchers enable efficient testing for React and JavaScript codebases, improving maintainability and readability of tests by organizing them into test suites.
Three common types of tests in software development: Unit tests for individual components, Integration tests for components interaction, and End-to-End tests for real user scenario simulation.
The Arrange-Act-Assert (AAA) pattern provides a structured way to organize and structure unit test cases, ensuring clear separation of setup, execution, and validation steps.
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