[4] It aims to run on any JavaScript-enabled platform, to not intrude on the application nor the IDE, and to have easy-to-read syntax.

It is heavily influenced by other unit testing frameworks, such as ScrewUnit, JSSpec, JSpec, and RSpec.

Other built-in matchers include toBe, toBeTruthy, toBeFalsy, toContain, toBeDefined, toBeUndefined, toBeNull, toBeNaN, toBeGreaterThan, toBeLessThan, toBeCloseTo.

The condition matchers toBeTruthy, toBeFalsy evaluate if something is true or false and toBeDefined, toBeUndefined check if something is defined or undefined.

Matcher toContain is used to verify that an element, object or sub-string is contained in an array, list or string.