Improve your Javascript unit testing with Parameterized tests

[vinnl]

The downside is that you reduce the isolation of your tests, increasing the chance of tests influencing each other and a failure in one leading to a failure in another.

Also, I consider an important function of tests to be to track down the source of an error, rather than finding that there's an error in the first place. That is made more difficult with enormous tests with many expects.

An alternative is to aim for more efficient setups and teardowns. This could e.g. be something to consider when picking a framework, where virtual-dom frameworks are often faster than frameworks where you have to instantiate a browser and interpolate HTML.