Have you conducted testing of components or functions in frontend development?

Yes, I have conducted testing of components and functions in frontend development. This usually includes:

• Unit testing — testing individual functions or components using Jest, Mocha, or other frameworks.
• Snapshot testing — for React/Vue components, to track UI changes.
• Integration testing — testing the interaction of multiple components.

An example of a simple Jest test for a sum function:

function sum(a, b) {
  return a + b;
}

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});

This approach helps quickly identify errors and maintain code quality.