Should you use jest as a testing library? (2022)

Jest, a popular testing framework created by Facebook, is widely used but has caused challenges for backend developers. This article explores Jest’s pros and cons and provides solutions for dealing with its limitations. Jest is a JavaScript Testing Framework known for its isolated testing feature, which maximizes performance by running tests in separate processes. However, this isolation can lead to issues with the instanceof operator, causing false negatives. The article suggests using alternative test environments or runners, such as jest-environment-node-single-context and jest-light-runner, to overcome these problems. Overall, while Jest is effective for frontend applications, it may not be ideal for Node.js applications.

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