11/2/2023 0 Comments Jest mock aws![]() mock √ should successfully mock dynamoDBClient (2 ms) Test Suites: 1 passed, 1 total Tests: 1 passed, 1 total Snapshots: 0 total Time: 2.307 s, estimated 3 s Ran all test suites.Īs the PutItem() function also accounts for and thrown errors, it is also possible to fully test this by using the mockRejectedValue() function. Running npm test now will result in a successful test run. npm install jest standard, add the following to your package.json file scripts: ) In this article, I will be using the DynamoDB client, however this works with any clients that make use of the send() function for their operations. You can do that here.īefore starting, make sure that you have Jest and any AWS modules that you plan to test with, installed. You can install it with your favorite package manager. Internally, it uses Sinon.JS to create robust stubs in place of the SDK calls. As such, I will not be going into the internals of Jest. The mocking library for AWS SDK for JavaScript (v3) can be used in any JavaScript unit testing framework. □ Note: The aim of this article is to be a quick demo of mocking the not a Jest integration overview. This quick article hopes to alleviate this issue, showing one way that makes mocking client libraries a breeze. However, in AWS's refactored solution, it has become less clear to some how to properly mock these new modules. No longer are the days of having to import all operations related to DynamoDB just to put an item into a database. The recent V3 update to AWS's JavaScript SDK has introduced a number of benefits to developers, especially when it comes to bundle sizes and modularity.
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