@salesforce/sfdx-lwc-jest
By Salesforce
What It Does
Official Jest testing framework for Lightning Web Components. Write unit tests for LWC locally without deploying to an org.
Glen's Take
LWC testing done right. Tests run locally in milliseconds, no org required. Mock wire adapters, simulate user interactions, test component rendering. The official stubs for lightning-base-components save tons of setup time. Include this in every LWC project from day one.
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