-
If you're writing unit tests for your React components these days, there's a good chance you're using React Testing Library. It supports user-focused testing with reliable selectors to find elements, such as the data-testid attribute or finding an element by role. Specific and reliable selectors are key to make sure …
Read More -
Code coverage - how many code lines and branches are accessed during a test - is easy to measure in many languages and test frameworks. And at first glance, measuring code coverage seems like a no-brainer. After all, who wouldn't want to make sure their code is sufficiently tested? But just because a metric is easy to …
Read More -
The OpenTelemetry Java instrumentation agent automatically instruments many common frameworks but there are times you may want to customize your application's telemetry by adding your own custom spans, adding attributes to existing spans, etc. In that case, it can be helpful to verify the custom instrumentation through …
Read More -
Recently I was working on sorting rows in a table in React and I wanted to be able to verify the rows sorted into the correct order. The table shows flaky tests (that is, tests that intermittently fail) and is built with Material Table. Material Table conveniently supports sorting out of the box by clicking on the …
Read More -
After I added the ability to collect and store code coverage stats in the Projektor test reporting tool, I wanted to also add a graph that showed the trend of code coverage over time. Then users could track their repo's code coverage to see if was increasing, decreasing, or staying the same. The Projektor UI is built …
Read More