It is a powerful tool with rich features for writing JavaScript tests. This JavaScript library enables the creation, structuring, and running of LWC Jest tests.
Jest is distributed as an NPM package and helps to obtain information about the code coverage. It also supports mocks to isolate tests from complicated dependencies, due to which tests can be executed fast.
Salesforce CLI commands use to create scratch orgs for developing and testing customizations, and synchronize source code between orgs and source repositories.
A Wrapper Class, in simple terms, is an object created in Apex – similar to a custom object but created in code. This data lives only in code during your transaction and does not consume database storage. It’s a data structure or an abstract data type that can contain different objects or collections of objects as its members.
Its instances could be different data types