Cypress has adopted Mocha’s
bdd syntax, which fits perfectly with both integration and unit testing. All of the tests you’ll be writing sit on the fundamental harness Mocha provides, namely:
Additionally, Mocha gives us excellent
async support. Cypress has extended Mocha, sanding off the rough edges, weird edge cases, bugs, and error messages. These fixes are all completely transparent.
While Mocha provides us a framework to structure our tests, Chai gives us the ability to easily write assertions. Chai gives us readable assertions with excellent error messages. Cypress extends this, fixes several common pitfalls, and wraps Chai’s DSL using subjects and the
When writing integration tests, you will likely work a lot with the DOM. Cypress brings in Chai-jQuery, which automatically extends Chai with specific jQuery chainer methods.http://sinonjs.org/
When writing unit tests, or even in integration-like tests, you often need to ability to stub and spy methods. Cypress includes two methods,
cy.spy() that return Sinon stubs and spies, respectively.
Cypress also exposes a utility so that
sinon can be called anywhere inside of your tests using
When working with
spies you’ll regularly want to use those when writing Chai assertions. Cypress bundles in Sinon-Chai which extends Chai allowing you to write assertions about
Cypress also bundles the following tools on the
Cypress object. These can be used anywhere inside of your tests.