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I have a moderate sized legacy project where I need to migrate tests from Enzyme to React Testing Library (RTL). Probably 150+ test files, each containing upwards of 10 test cases.

While not using Copilot, I have GTP-4o assistant with a system prompt setup from trial and error to convert a given test from Enzyme to RTL. There are certain scenarios where a given test cannot actually exist in RTL due to a difference in testing philosophy between the two frameworks and I am required to make some decisions, but overall this is probably 10x faster than refactoring these tests by hand.

One of the important aspects of this, though, is when a I encounter a repeated failure of the LLM, I update the system prompt going forward. Even though this is a simple 1-shot approach, it still works well for a task like this.