Run Jest tests

Group related tests together

Run the test watcher

Write individual test cases

jest

test

it("should do something", () => { ... })

it blocks define individual test cases with descriptive names and test logic.

Basic test case

it("should return true", () => { ... })

Error handling test

it("should handle errors gracefully", () => { ... })

Run tests in watch mode

Generate test coverage report

Make assertions in tests