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Some things can be checked with unit tests, but some cannot. For example, by using the https://testing-library.com (with e.g. Cypress, Puppeteer or Jest) you can choose to look up elements by role an label, which will force you to have that wired up correctly. You also have things like https://www.deque.com/axe/, which can check that your images have alt attributes, that you don't onClick events without keyboard alternatives, etc. But yeah, some tests just have to be done manually, I believe.
Some things can be checked with unit tests, but some cannot. For example, by using the https://testing-library.com (with e.g. Cypress, Puppeteer or Jest) you can choose to look up elements by role an label, which will force you to have that wired up correctly. You also have things like https://www.deque.com/axe/, which can check that your images have alt attributes, that you don't onClick events without keyboard alternatives, etc. But yeah, some tests just have to be done manually, I believe.
This is the specific chart file, including those option and data objects. rainfallChart.jsx
Yes it is chart.js using https://react-chartjs-2.js.org React components and chartjs-plugin-zoom/ for the controls, pan and zoom features. The setup itself was a little tedious setting up the correct options and data objects. There isn't an options constructor to instantiate option or data objects so no autocomplete or property lookup. A lot of trial and error.