Enzyme's lack of support for React 18 rendered unit tests unusable, negatively impacting foundational confidence in testing, prompting Slack's migration to React Testing Library.
Transitioning from Enzyme to React Testing Library shifted the focus from testing internal implementation specifics to simulating real user interactions with components.
The initial use of a Large Language Model to convert tests had mixed success; however, combining it with AST transformations led to an 80% conversion success rate.
A quality rubric was established to assess generated code quality, covering aspects such as error handling, imports, rendering, and overall functionality.
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