jest.requireActual(moduleName) Returns the actual module instead of a mock, bypassing all checks on whether the module should receive a mock implementation or not. toHaveTextContent ('My Name Is: C3P0') * To test a component that provides a context value, render a matching * consumer as the child Pastebin.com is the number one paste tool since 2002. Jest expect has a chainable .not assertion which negates any following assertion. Using Enzyme with SystemJS. Also all TypeScript files should be in a src folder which is always recommended (even without Jest… This is seen as good practice at the unit test level, as we don’t want these tests dependant on an external API which will … The Question : 316 people think this question is useful I want to test that one of my ES6 modules calls another ES6 module in a particular way. Using Enzyme with Karma. Example: const mathjs = require ( 'mathjs' ) test ( `The mathjs log function` , () => { const spy = jest . As a bonus, Jest not only can unit test Reactive Native apps, but it can also unit test other JavaScript frameworks, such as Angular, Vue, Bable, TypeScript, and Node. Using Enzyme with Webpack. getByText (/^My Name Is:/)). That said, jest is an excellent unit testing option which provides great TypeScript support. Jest documentation There are other adapters in Enzyme’s installation instructions. Partial module mocking with jest.requireActual. expect (screen. No testing solution out there is perfect. expect (screen. With Jasmine this is super easy — The application code: And the test code: What’s the equivalent with Jest? Jest is the best option for most React Native projects. toHaveTextContent (route) Reducing boilerplate # You can use the wrapper option to wrap a MemoryRouter around the component you want to … jest-enzyme with Jest. When you import a package, you can tell Jest to “spy” on the execution of a particular function, using spyOn(), without affecting how that method works. getByTestId ('location-display')). Pastebin is a website where you can store text online for a set period of time. I feel like this is such a simple […] should-enzyme for should.js. Using Enzyme with Browserify. expect-enzyme for expect. Using Enzyme with Mocha. This is true for stub/spy assertions like .toBeCalled(), .toHaveBeenCalled(). Between test runs we need mocked/spied on imports and functions to be reset so that assertions don’t fail due to stale calls (from a … spyOn ( mathjs , 'log' ) const result = mathjs . import Enzyme from 'enzyme' import Adapter from 'enzyme-adapter-react-16' Enzyme.configure({ adapter: new Adapter() }) package.json "jest": { "setupFiles": [ "test/setup.js" ] } This configures Enzyme for React v16, and Jest to automatically configure Enzyme for you. 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