You can safely assume tests inside a single file will run in the order of appearance. You could prove this by putting a console.log in each it block. It’s probably worth mentioning that it’s generally bad practice to rely on the order of execution / external state…and you never know, Jest (or the current underlying … Read more
Just declare sandbox so it is available in the scope of beforeEach and test: let sandbox; beforeEach(async () => { sandbox = sinon.sandbox.create() … }) test(‘/add’, () => { // sandbox available for use })
Add following line in .eslintrc.js file “env”: { “jest”: true } or { “plugins”: [“jest”] }, “env”: { “jest/globals”: true } For more details check here, it also define the same. Hope you installed eslint-plugin-jest package.If not kindly go through for Documentation. All the configuration details of Configuring ESLint.
.contains receives a React Node or array of Nodes as an argument. Instead, use .find: expect(wrapper.find(‘selector’).exists()).toBeTruthy()
Just use not. expect(mockFn).not.toHaveBeenCalled() See the jest documentation
This means, that a file is not transformed through TypeScript compiler, e.g. because it is a JS file with TS syntax, or it is published to npm as uncompiled source files. Here’s what you can do. Adjust your transformIgnorePatterns allowed list: { “jest”: { “transformIgnorePatterns”: [ “node_modules/(?!@ngrx|(?!deck.gl)|ng-dynamic)” ] } } By default Jest doesn’t transform … Read more
This can be done with asymmetric matchers (introduced in Jest 18) expect(track).toHaveBeenCalledWith( expect.objectContaining({ “action”: “PublicationPage”, “category”: “PublicationPage”, “label”: “7”, “name”: “n/a” }) ) If you use jest-extended you can do something like expect(track).toHaveBeenCalledWith( expect.objectContaining({ “action”: “PublicationPage”, “category”: “PublicationPage”, “label”: “7”, “name”: “n/a”, “intervalInMilliseconds”: expect.toBeWithin(999, 1002) }) )
Great solution from @chiedo However, we use ES2015 syntax and I felt it was a little cleaner to write it this way. class LocalStorageMock { constructor() { this.store = {}; } clear() { this.store = {}; } getItem(key) { return this.store[key] || null; } setItem(key, value) { this.store[key] = String(value); } removeItem(key) { delete this.store[key]; … Read more
Jest suppresses the console log message by default. In order to show the console log message, set silent option to false at the command line set –silent=false in the command line: npm run test — –silent=false
As of Jest 22.0.0+, you can use the –clearCache option: Deletes the Jest cache directory and then exits without running tests. Will delete cacheDirectory if the option is passed, or Jest’s default cache directory.