feat(agent): add unit testing skill

[philibea]

Summary

add unit testing skill

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[jsulpis]

should we add the instruction to gather all accessibility tests in a separate a11y.test.tsx file ?

[philibea]

should we add the instruction to gather all accessibility tests in a separate a11y.test.tsx file

@jsulpis we should have a list of what we need to put there. Does a getbyRole is an a11y.test ?

[jsulpis]

should we add the instruction to gather all accessibility tests in a separate a11y.test.tsx file

@jsulpis we should have a list of what we need to put there. Does a getbyRole is an a11y.test ?

I don't understand the question. I would say the a11y.test.tsx file contains tests that check purely accessibility features like axe violations, keyboard support etc, while the regular tests use getByRole to check that the component renders and behaves correctly, so it can still check labels, descriptions etc but as a side effect. But the distinction is quite thin. wdyt ?