lytc / jest-testdouble Goto Github PK

npm i jest-testdouble expect --save-dev # "expect" is a peer dependency required for jest-testdouble to work

or

yarn add jest-testdouble expect --dev # "expect" is a peer dependency required for jest-testdouble to work

From Jest test helper (we recommend to use setupTestFrameworkScriptFile)

const td = require('testdouble');
const jestTestDouble = require('jest-testdouble');

jestTestDouble(td);

global.td = td;

This package add Jest matchers for TestDouble. Fallback to Jest matcher if the expect value is Jest mock/spy.

• [not].toHaveBeenCalled (alias [not].toBeCalled)
• [not].toHaveBeenCalledWith (alias [not].toBeCalledWith)
• [not].toHaveBeenCalledTimes (alias [not].toBeCalledTimes)
• [not].toHaveBeenLastCalledWith (alias [not].lastCalledWith)
• [not].toHaveBeenNthCalledWith (alias [not].nthCalledWith)

const drink = td.func('drink');
drink('beer');
expect(drink).toHaveBeenCalledWith('beer');

// Fallback to Jest matcher if expect value is Jest mock function
const eat = jest.eat('eat');
eat('rice');
expect(eat).toHaveBeenCalledWith('rice');

jest-testdouble requires the expect package to work. You just need to install it

npm i expect --save-dev

or

yarn add expect --dev