qunit-sinon-assertions

1.0.0 • Public • Published

qunit-sinon-assertions

Sinon assertions for QUnit with custom messages support and friendly default ones.

Why not just use assert.ok(spy.calledOnce, 'spy was called')?

  • the addon provides a lot more context in case of a failing test
  • it has user-friendly default messages, so you don't have to write your own in simple cases

Let's say we have this test code:

const emitStub = sinon.stub().named('emit');
emitStub('model-loaded-worng');

assert.ok(
  emitStub.calledWithExactly('model-loaded'),
  'emit was called with "loaded"'
);

assert.spy(emitStub).calledWithExactly(['model-loaded']);

The assert.ok approach doesn't give you any context:

before

The assert.spy provides more context:

after

Let's say we were lazy and didn't write custom messages:

const emitStub = sinon.stub().named('emit').returns('no way');
emitStub('model-loaded-worng');

assert.ok(emitStub.calledWithExactly('model-loaded'));
assert.ok(emitStub.returned('job is done!'));

assert
  .spy(emitStub)
  .calledWithExactly(['model-loaded'])
  .returnedWith('job is done!');

The assert.ok one will look like this:

before

The assert.spy will be:

after

Installation

First, install the addon:

yarn add -D qunit-sinon-assertions

Next, import qunit-sinon-assertions module anywhere in your tests/test-helper.js file:

// This will make `assert.spy()` API available in your tests.
import setupSinonAssert from 'qunit-sinon-assertions';
setupSinonAssert(QUnit.assert);

It's also recommended to install ember-sinon-qunit to get automatic sinon cleanup after each test. With both addons your config can look like this:

import Application from '../app';
import config from '../config/environment';
import { setApplication } from '@ember/test-helpers';
import { start } from 'ember-qunit';
import setupSinon from 'ember-sinon-qunit';
import setupSinonAssert from 'qunit-sinon-assertions';

setApplication(Application.create(config.APP));

setupSinon();
setupSinonAssert(QUnit.assert);

start();

Usage

It's possible to chain assertions:

assert.spy(fn)
  .calledTwice('should be called twice')
  .calledWith([arg1, arg2)], 'with these args')
  .returnedWith(value);

You can use Sinon matchers with most assertions like this:

assert.spy(fn).didNotReturnWith(sinon.match({ id: 1 }));

Here is an example of using the assertions in a real project: ember-on-resize-modifier tests

Name your stand alone spies for better error messages:

this.onResize = sinon.spy().named('onResize');
assert.spy(this.onResize).calledOnce();

// For methods it's not needed:
let obj = { method() {} };
let methodSpy = sinon.spy(obj, 'method');

Here are all available assertions (feel free to add more):

assert.spy(fn).called(message);
assert.spy(fn).notCalled(message);

assert.spy(fn).calledTimes(count, message);
assert.spy(fn).calledOnce(message);
assert.spy(fn).calledTwice(message);

assert.spy(fn).calledWith([arg1, arg2)], message);
assert.spy(fn).notCalledWith([arg1, arg2)], message);

assert.spy(fn).calledWithExactly([arg1, arg2)], message);
assert.spy(fn).notCalledWithExactly([arg1, arg2)], message);

assert.spy(fn).returnedWith(value, message);
assert.spy(fn).didNotReturnWith(value, message);

assert.spy(fn).threw(message);
assert.spy(fn).threwWith(exception, message);

assert.spy(fn).lastCalledWith([arg1, arg2)], message);
assert.spy(fn).lastNotCalledWith([arg1, arg2)], message);

assert.spy(fn).lastCalledWithExactly([arg1, arg2)], message);
assert.spy(fn).lastNotCalledWithExactly([arg1, arg2)], message);

assert.spy(fn).lastReturnedWith(value, message);
assert.spy(fn).lastDidNotReturnWith(value, message);

Contributing

See the Contributing guide for details.

License

This project is licensed under the MIT License.

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