Understand the mantra of the test-driven development with Jest.

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Mantra: red, green, repeat

This chapter’s mantra, “Red, green, repeat,” encapsulates test-driven development (TDD) in a nutshell. Whenever you feel stuck, let the mantra guide you. In the long term, the habit of putting tests first helps to form a healthy mindset for problem-solving, one in which failing code evokes curiosity instead of despair.

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