Code Intelligence Integrates with Jest
February 21, 2023

Code Intelligence announced integrating its recently open-sourced JavaScript fuzz testing engine, Jazzer.js, into Jest, a unit testing framework for JavaScript.

Developers can now use Jest for both functional and security testing without ever having to leave their development environment.

Code Intelligence’s new fuzz testing integration for Jest allows developers to run automated security tests, complimentary to their existing unit tests and enables them to test JavaScript applications for unknown bugs. Soon, Jazzer.js will also receive specialized bug detectors for critical vulnerabilities, including remote code executions (such as Log4Shell), cross-site-scripting, and injections.

“While most JavaScript developers already use Jest for functional testing, to test whether their application behaves as expected, our new Jest integration allows developers to also do negative testing. This is to check their applications for unexpected or strange behaviors. It does not only avoid security issues but makes the code more reliable and reduces outages and bad user experience.”, says Werner Krahe, Product Director of Code Intelligence.

Jazzer.js is a free, coverage-guided, in-process fuzzer for the entire Node.js platform. To ease accessibility, it is available within JavaScript’s node package manager (npm), which is used by most JavaScript developers to download their tooling. Developers can call Jazzer.js in Jest, by using the new it.fuzz() function in describe() blocks. This function calls highly automated fuzz tests that use coverage feedback to generate millions of unusual and unexpected test inputs that can trigger security vulnerabilities and functional bugs. Jazzer.js also provides a regression mode, which is useful in making sure that newly added code doesn’t break existing functionality.

“Our mission is to give every developer the necessary tools to write more secure code,” says Khaled Yakdan, Chief Scientist and Co-Founder of Code Intelligence. “The fuzz testing integration for Jest will help in making JavaScript applications more reliable and secure.”
Jazzer.js enables coverage-guided fuzzing for JavaScript and the Node.js.

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