Jest

Jest is JavaScript unit testing framework that is used primarily for testing JavaScript applications built using Node or React. Jest provides a testing sandbox for parallel test management to prevent conflicts. It is a ‘zero configuration’ tool, that also provides useful reports, like test code coverage, although Blaze is using SonarCloud to manage test coverage and code quality.

Jest also provides a powerful mocking library, which automatically mocks dependencies and allows tests to be run in a fake DOM implementation, facilitating Blaze interface development for developers.

License: Open Source (MIT)