@joytest/expect

Small assertion module.

Function	Description	Since
💥 expect(a).toBe(b)	Asserts that a and b are the same (===). 💥 Throws if assertion failed.	v1.0.0
💥 expect(a).toBeInstanceOf(b)	Asserts that a is an instance of b. 💥 Throws if assertion failed.	v1.0.0
💥 expect(a).toEqual(b)	If b is a primitive then: a === b If b is not a primitive: • Asserts same prototype • Asserts same properties • Asserts property value recursively with toEqual. 💥 Throws if assertion failed.	v1.0.0
💥 expect(a).toHaveProperty(b)	Asserts that object a has an enumerable/non-enumerable property called b. 💥 Throws if assertion failed.	v1.0.0
💥 expect(a).toHaveSubString(b)	Asserts that string a contains the sub-string b. 💥 Throws if assertion failed.	v1.0.0
💥 expect(fn).toThrowError()	Asserts that fn throws an error. 💥 Throws if assertion failed.	v1.0.0
💥 expect(fn).toThrowError(message)	Asserts that fn throws an error with a message containing message. 💥 Throws if assertion failed.	v1.0.0
💥 expect.assertions(num)	Sets how many expect() function calls are expected. 💥 Throws if expect.assertions is already set.	v1.0.0

All assertions (except toThrowError) can be negated with .not:

expect(1).not.toBe(2)

Example usage:

import {createExpectationsContext} from "@joytest/expect"
const {expect, end} = createExpectationsContext()

expect(1).toBe(1)
end()