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Chai Assertion Library Mastery Hub: The Industry Foundation

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Q1Domain Verified
In the context of advanced Chai assertion patterns, which of the following would be the most idiomatic and performant way to assert that an object `user` contains a specific nested property `address.city` with the value "Metropolis", considering potential nullish or undefined intermediate properties?
`expect(user).to.have.nested.property('address.city', 'Metropolis');`
`expect(user).to.have.deep.property('address.city', 'Metropolis');`
`expect(user).to.have.property('address').and.to.have.property('city', 'Metropolis');`
`expect(user.address.city).to.equal('Metropolis');`
Q2Domain Verified
When dealing with asynchronous operations and Chai, what is the recommended approach to assert the final state of a promise that is expected to resolve with a specific value after a delay?
`myPromise.then(value => expect(value).to.equal(expectedValue));`
`await expect(myPromise).to.eventually.equal(expectedValue);`
and.eventually.equal(expectedValue);` D) `setTimeout(() => expect(myPromise).to.equal(expectedValue), 100);`
`expect(myPromise).to.be.fulfille
Q3Domain Verified
Consider a scenario where you need to assert that an array `data` contains objects, and each object must have a specific property `id` that is a number, and another property `name` that is a string. Which Chai assertion would be most appropriate and efficient for this complex array validation?
`expect(data).to.satisfy(arr => arr.every(item => typeof item.id === 'number' && typeof item.name === 'string'));`
`expect(data).to.deep.equal([{ id: Number, name: String }]);`
`expect(data).to.all.have.property('id').an
to.all.have.property('name');` D) `expect(data).to.be.an('array').and.to.all.satisfy(item => typeof item.id === 'number' && typeof item.name === 'string');`

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