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You could use jest.mock(moduleName, factory, options) to mock aws-sdk module manually. E.g. handler.js: const aws = require('aws-sdk'); const dynamoDb = new aws.DynamoDB.DocumentClient(); const promisify = (foo) => new Promise((resolve, reject) => { foo((error, result) => { if (error) { reject(error); } else { resolve(result); } }); }); const getUser = (userId) => promisify((callback) => dynamoD..

.toBeTruthy()​ Use .toBeTruthy when you don't care what a value is and you want to ensure a value is true in a boolean context. For example, let's say you have some application code that looks like: drinkSomeLaCroix(); if (thirstInfo()) { drinkMoreLaCroix(); } You may not care what thirstInfo returns, specifically - it might return true or a complex object, and your code would still work. So if ..

Setting up configuration for a create-react-app based project Let's say you have created your project using the create-react-app Facebook helper. In this case, you don't have direct access to jest, so you have to execute react-scripts to get your tests working. To follow this guide: As a starting point, you can take the (create-react-app/00-start) sample. Or you can create a project from scratch..

const getMedia = async (mediaId) => (await makeRequest({ url: `${MEDIA_BASE_URL}/admin/media/${mediaId}`, method: 'GET' })).data If this is the function that is making the request through the Axios, we can make it with some curry function and Axios innate data of config to make it and return it with Promise.resolve. const createMockImplementation = ({ contentId, mediaId }) => (config = {}) => { ..

Reset/Clear with beforeEach/beforeAll and clearAllMocks/resetAllMocks Assuming we have a global stub or spy that is potentially called mutliple times throughout our tests. const mockFn = jest.fn(); function fnUnderTest(args1) { mockFn(args1); } test('Testing once', () => { fnUnderTest('first-call'); expect(mockFn).toHaveBeenCalledWith('first-call'); expect(mockFn).toHaveBeenCalledTimes(1); }); t..

Mock Functions Mock functions allow you to test the links between code by erasing the actual implementation of a function, capturing calls to the function (and the parameters passed in those calls), capturing instances of constructor functions when instantiated with new, and allowing test-time configuration of return values. There are two ways to mock functions: Either by creating a mock functio..

Jest worker encountered 4 child process exceptions, exceeding retry limit If you see this kind of message in your Console, it means that it has to be done with Async and await. In my case.. describe('InputSchema when validated', () => { it('should be a valid schema', async () => { expect(Joi.isSchema(InputSchema)).toBe(true) InputSchema.validateAsync(mockValidInput) InputSchema.validateAsync(moc..

describe(name, fn)​ describe(name, fn) creates a block that groups together several related tests. For example, if you have a myBeverage object that is supposed to be delicious but not sour, you could test it with: const myBeverage = { delicious: true, sour: false, }; describe('my beverage', () => { test('is delicious', () => { expect(myBeverage.delicious).toBeTruthy(); }); test('is not sour', (..

JEST TESTING mockdata Use Mockdata files to store fake data values for the testing jest.mock take away the functionality of it do nothing (we don't have to run everything) I don't want to send a notification of sns so did a mock Set a global variable of response jest.requireActual it uses all thd data uses actual function using only one function there to require it most of the times we do only m..

Best JavaScript code snippets using joi.date origin: blacksmithstudio/blockbase cli/templates/models/schemas/foo.js/Joi.object.keys Joi.object().keys({ id : Joi.number().integer(), firstname : Joi.string().max(128).optional(), lastname : Joi.string().max(128).optional(), created_at : Joi.date().default(() => moment().format(), 'date created'), updated_at : Joi.date().default(() => moment().forma..