Black Venus

Simple yet powerful mocking library

Install

npm install black-venus

Usage

More examples of usage can be found in create-spy.test.js

import { createSpy } from "black-venus"; // const { createSpy } = require('black-venus')

function student(calculator) {
  calculator(100, 100);
  calculator(10, 10, 7);
  calculator.substract(500, 100);
}

const spy = createSpy({ fakeFunction: () => 55 });
spy.planRehearsals({ given: [10, 10, 7], returns: 49 });
spy.substract.fakeValueOnce(27);

const result = student(spy);

console.log(spy.results[0] === 55);
console.log(spy.results[1] === 49);
console.log(spy.substract.calls[0][0] === 500);
console.log(spy.substract.results[0] === 27);

API

spy = createSpy(options?)

options?

Type: object | function | string Default: { fakeFunction: () => createSpy, name: '' }

fakeFunction will be used to return a value once the spy has been called. name will be used as the name of the spy.

If given a string, then that string will be used as the value for the name. If given a function, then that function will be used as the for fakeFunction. You can also pass an object with both or either keys set.

TODO

• callOrder
• fakeKeys
• renameKeys
• lockKeys
• restart

spy.fakeValue()

spy.fakeValueOnce()

spy.throws()

spy.setSpyName()

spy.bind()

spy.getReadCount()

spy.spyName

spy.calls

spy.results

spy.instances

spy.hasBeenCalled

spy.fakeFunction()

spy.fakeFunctionOnce()

spy.fakeResolvedValue()

spy.fakeResolvedValueOnce()

spy.fakeRejectedValue()

spy.fakeRejectedValueOnce()

spy.planRehearsals({ given: Array, returns: Function | any })

spy.planRehearsals({ given: Array, resolves: Function | any })