July 2013
Intermediate to advanced
168 pages
3h 40m
English
Content preview from Backbone.js TestingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Spicing up Chai with the Sinon.JS plugin
One of the primary motivations for using the Chai library is the natural language syntax of its chained assertions. Another strong point of Chai is that it produces clear error messages on assertion failures.
Unfortunately, Sinon.JS spies create some assertion challenges within our test framework. To illustrate the issue, let's focus on the previous example that asserts that the obj.multiply() method (wrapped in a spy) was called with the parameters 5 and 2.
At this point, we have encountered two ways of making assertions on Sinon.JS spies—with Chai assertions and with Sinon.JS built-in spy assertions. Starting with the first method, we can write a Chai assertion on the spy as follows:
expect(obj.multiply.calledWith(5, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.