By default any code in node_modules is ignored by babel-jest, see the Jest config option transformIgnorePatterns. I’ve also created a PR on your example repo, so you can see it working. While this works, I’ve found it to be extremely slow in real applications that have a lot of dependencies containing ES modules. The Jest … Read more
You can use this simple override : let error = console.error console.error = function (message) { error.apply(console, arguments) // keep default behaviour throw (message instanceof Error ? message : new Error(message)) } You can make it available across all tests using Jest setupFiles. In package.json : “jest”: { “setupFiles”: [ “./tests/jest.overrides.js” ] } Then put … Read more
I still haven’t found a perfect solution, but for the moment I went for this workaround : jest –config ./test/jest-e2e.json –forceExit The –forceExit option kill the openHandles somehow and unlock everything. Yet, I’m still looking for the “proper way” of handling that issue.
You can use the –watchAll=false parameter. So for example you can create another script like this: “scripts”: { “test:nowatch”: “react-scripts test –watchAll=false”, } And then run “pre-commit”: [ “precommit-msg”, “lint”, “test:nowatch” ],
’11 111.11′.split(”).map(x => console.log((x.charCodeAt(0)))) Yields “32” for the space character which is a normal space. new Intl.NumberFormat(‘fr-CA’).format(11111.11).split(”).map(x => console.log((x.charCodeAt(0)))) Yields “160” for the space character, which is a non-breaking space. To make these tests pass, you need to add the non-breaking space UTF-16 (\xa0) character code into the assertion. expect(formatCurrency(24555.55, ‘fr_CA’, true)).toBe(’24\xa0555,55 $’);
You can tell TypeScript that you’re defining global.fetch as a Jest mock. global.fetch = jest.fn(() => Promise.resolve({ json: () => Promise.resolve({ test: 100 }), }), ) as jest.Mock;
As you already mentioned there is expect().toThrow() 🙂 So in your case: test(“should throw error when not wrapped inside `UserProvider`”, () => { expect(() => render(<TestComponent />)) .toThrow(“Cannot use `useUser` outside of `UserProvider`”); }); Regarding the console.error: Currently there is by design no way to turn off the default error logs. If you want to … Read more
While it should be bundled with jsdom, it isn’t with jsdom 16. Therefore you can polyfill like so: import { TextEncoder, TextDecoder } from ‘util’; Object.assign(global, { TextDecoder, TextEncoder }); You will have to add that to the test or to a setupFile like setup.jest.ts.
@babel/preset already has support for what you need. According to the react 17 documentation I only had to set the runtime to automatic in my babel.config.json. { “presets”: [ [“@babel/preset-react”, { “runtime”: “automatic” }] ] } If you are using @babel/plugin-transform-react-jsx the config should be { “plugins”: [ [“@babel/plugin-transform-react-jsx”, { “runtime”: “automatic” }] ] } … Read more