@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 === bIf 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()