Chai quiz

Test your Chai knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

What does `expect(array).to.include(value)` check?

1. What does `expect(array).to.include(value)` check?
2. What does `expect(obj).to.have.keys("a", "b")` check?
3. In the `assert` style, what does `assert.isTrue(value)` do differently from `assert.ok(value)`?
4. What is a key readability advantage often cited for Chai's BDD (`expect`/`should`) style over the TDD (`assert`) style?
5. What is the difference between `.deep.equal()` and `.equal()` when comparing two objects?
6. What does `expect(string).to.match(/^[a-z]+$/)` check?
7. What is Chai?
8. How would you assert that an array has a specific length using Chai?
9. What are Chai plugins (like `chai-as-promised` or `sinon-chai`) used for?
10. What are the three assertion styles Chai supports?
11. What is the difference between `expect(value).to.be.null` and `expect(value).to.not.exist`?
12. What does `expect(obj).to.be.an.instanceof(MyClass)` check?

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