As far as test runners go, I think mocha and jest go neck and neck and are quite equal - although jest is easier to set up.
I really like Chai's chainable assertions, as they allow you to make complex assertions with ease, compared to jest's non-chainable ones.
The strongest point of jest is the jack-of-all-trades approach, when you don't need any other library for your tests.
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As far as test runners go, I think mocha and jest go neck and neck and are quite equal - although jest is easier to set up.
I really like Chai's chainable assertions, as they allow you to make complex assertions with ease, compared to jest's non-chainable ones.
The strongest point of jest is the jack-of-all-trades approach, when you don't need any other library for your tests.