How can I effectively test a JavaScript library?

How can I effectively test a JavaScript library?

You can use frameworks like Jest or Mocha for unit testing. They provide tools to write and run tests easily.

What are some best practices for writing tests?

Best practices include writing clear and concise tests, covering edge cases, and keeping tests isolated from each other.

How do I mock dependencies in my tests?

You can use libraries like Sinon.js to create mocks and stubs for your dependencies, allowing you to isolate the code under test.

Can you give me an example of a test case?

Sure! Here's a simple example using Jest:

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