Simply use this dot-notation name as the service parameter to the mock() and restore() methods: AWS.mock('DynamoDB. It is possible to mock nested services like DynamoDB.DocumentClient. (Make sure that you have the serverless framework set up on your system.) Run this command: serverless create -template. From there, you will create a new serverless application using the aws-nodejs template. Go to the circleci-serverless-unit-testing directory. How? ( Usage) install jest-aws-sdk-mock from NPM npm install jest-aws-sdk-mock -save-dev Use in your Tests Using plain JavaScript const AWSMock = require('jest-aws-sdk-mock') ĪWSMock.mock('DynamoDB', 'putItem', function (params, callback) as any).promise() Run: mkdir circleci-serverless-unit-testing cd circleci-serverless-unit-testing. 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. Uses Jest under the hood to mock the AWS SDK services and their associated methods. METHOD 1: Writing manual mocks in JEST JEST framework allows us to write manual implementations of the original classes, these are called Manual mocks. With the Global Setup/Teardown and Async Test Environment APIs, Jest can work smoothly with DynamoDB. There's no need to load any dependencies. Create jest-dynamodb-config.js and define DynamoDB tables.

This is a rewrite of but using jest under the hood instead of sinon.js. Jest DynamoDB provides all required configuration to run your tests using DynamoDB. This module was created to help test AWS Lambda functions but can be used in any situation where the AWS SDK needs to be mocked.

Jest mock aws