I’m surprised no one here gives the most idiomatic answer yet. You can use getByRole() and pass an accessible name. The accessible name is the text of the button or the value of aria-label attribute. It can be used to query a specific element if multiple elements with the same role are presented on the … Read more
Follow this guide: https://www.npmjs.com/package/eslint-plugin-jest Basics is: npm i –save-dev eslint-plugin-jest Add this to your .eslintrc file: “plugins”: [“jest”] Then your env property “jest/globals”: true should work.
I had a similar concern that was fixed with this issue from react router I would suggest you change the mock as is: // pay attention to write it at the top level of your file const mockedUsedNavigate = jest.fn(); jest.mock(‘react-router-dom’, () => ({ …jest.requireActual(‘react-router-dom’) as any, useNavigate: () => mockedUsedNavigate, })); // your describe/it/test … Read more
For everyone who sees this question in > 2019: Since Nov 2020, AsyncStorage was renamed back to @react-native-async-storage/async-storage”, which causes this warning to appear if you’re importing it from react-native: Warning: Async Storage has been extracted from react-native core and will be removed in a future release. The new module includes its own mock, so … Read more
In order to one among the expected value, you can reverse the comparison and test it using toContain method like expect(addFeedForm.state().feedfrequency).toEqual(”); addFeedForm.simulate(‘change’); expect([6, 12, 24]).toContain(addFeedForm.state().feedfrequency)
Generally in some IDEs, the breakpoints are fixed to the line number. So if code in that file changes after the breakpoint is set, the breakpoint doesn’t move. So when making changes, stop the debug mode make the changes set the breakpoint start debug mode again. This worked for me.
You could try to use jest.createMockFromModule in your test and mock only the method you need. (previously in Jest versions prior to 26 called genMockFromModule) Hope it helps
Fetch 3.0 is designed for using esmodules instead of commonjs. Therefore you have to make sure you import it into a module. For example: to import it to app.js : Add “type”:”module” in your package.json and then import it. For importing it to other files or app.js even, you can also change the extension from … Read more
OK, I’ve figured it out. The trick is, to split functions into separate files. So the code is (and works in https://repl.it/languages/jest ): // add.js child = require(‘./child’).child; function main(a) { if (a == 2) { child(a + 2); } return a + 1; } exports.main = main; extracted child.js file: // child.js function child(ch) … Read more
You can check whether a parent component has rendered its child component using containsMatchingElement(). Based on Enzyme docs: Returns whether or not a patternNode react element matches any element in the render tree. Your test should look like this: describe(‘Parent Component’, () => { it(‘renders Child component’, () => { const wrapper = shallow(<Parent store={store} … Read more