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chai-as-promised

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chai-as-promised

Extends Chai with assertions about promises.

  • 5.3.0
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  • npm
  • Socket score

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What is chai-as-promised?

The chai-as-promised npm package extends Chai with a fluent language for asserting facts about promises. It allows developers to work with promises in their test assertions in a more natural and expressive way, which is particularly useful when dealing with asynchronous operations in tests.

What are chai-as-promised's main functionalities?

Asserting a promise is fulfilled

This feature allows you to assert that a promise will be fulfilled. In other words, it checks that the promise will eventually resolve.

expect(promise).to.be.fulfilled;

Asserting a promise is rejected

This feature allows you to assert that a promise will be rejected. This is useful for testing error handling in asynchronous code.

expect(promise).to.be.rejected;

Asserting a promise is rejected with a specific error

With this feature, you can assert that a promise is not only rejected but also that it is rejected with a specific type of error.

expect(promise).to.be.rejectedWith(Error);

Asserting a promise's fulfillment value

This feature allows you to assert what value a promise will be resolved with. The 'eventually' chain is used to wait for the promise to resolve before making the assertion.

expect(promise).to.eventually.equal('foo');

Chaining assertions

chai-as-promised supports chaining assertions, allowing for more complex assertions on the resolved value of a promise.

expect(promise).to.eventually.have.property('bar').that.is.a('string');

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Package last updated on 20 Mar 2016

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