Red-First TDD
By the end of this guide, you will:
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Discover why snapshot tests can’t drive design
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Understand the red-green-refactor cycle
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Write failing assertion-based tests that express intent before code exists
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TDD directory traversal: Enter navigates into directories, Backspace goes to parent
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Know when to use assertions (driving design) vs snapshots (guarding regressions)
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Add new semantic messages to your Router (
enter_directory,go_parent)
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