Download e-book for kindle: Jasmine JavaScript Testing by Paulo Ragonha

By Paulo Ragonha

From a bit renegade scripting language to the de facto
standard platform of at the present time, JavaScript has develop into a universal
language on hand within the widest variety of units it truly is truly
the 'write as soon as, run everywhere' language. even if, as JavaScript
applications turn into extra advanced, trying out and applying
sustainable software program engineering practices additionally become

Jasmine JavaScript trying out is a pragmatic advisor to a more
sustainable JavaScript improvement strategy. you'll research by
example find out how to force the improvement of an internet software using
tests and most sensible practices.

This ebook is set changing into a greater JavaScript developer. So,
throughout the chapters, you won't purely know about writing
tests, but additionally concerning the top practices for writing software program in
the JavaScript language. This ebook is set acknowledging
JavaScript as a true platform for software improvement and
leveraging all of its capability. additionally, you will study about
tooling and automation and the way to make your lifestyles more straightforward and more

You will create a sustainable codebase with the help
of Jasmine. we are going to have a look at built-in trying out (with a
backend NodeJS server) and the way you could pace this method up by
faking AJAX requests. As you move during the publication, you will
learn concerning the demanding situations of checking out an software equipped on top
of a framework and the way you could hinder your program from
suffering from dependency administration hell. additionally, on the grounds that your
applications have to get into creation, you are going to study about
optimizing the code to minimize the variety of requests the browser
needs to make whereas loading your application.

With this publication, you'll research every little thing you must be aware of to
become a true specialist within the ever-demanding JavaScript

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Extra info for Jasmine JavaScript Testing

Sample text

Consider the mockup interface of our Investment Tracker application: Investment Tracker mockup interface How would you go on implementing it? It is easy to see that this application has two different responsibilities: • One to add an investment • And another to list the added investments So we could start by breaking this interface into two different components. js, and call them Views. So here it is, at the top level of the interface, with two base components: • NewInvestmentView: This will be responsible for creating new investments • InvestmentListView: This is going to be a list of all added investments [ 40 ] Chapter 3 The module pattern So we understand how we must breakup the code, but how do we organize it?

IsGood(); } Run the specs again and the error message should change: Custom matcher's custom message Now, let's consider another acceptance criterion: "Given an investment, when its stock share price devalorizes, it should be a bad investment". [ 28 ] Chapter 2 Although it is possible to create a new custom matcher (toBeABadInvestment), Jasmine allows the negation of any matcher by chaining not before the matcher call. toBeAGoodInvestment(); }); }); But there is a catch! isGood = function() { return true; }; After running the specs again, you can see that this new spec is failing, but the error message is wrong: Expected investment to be a good investment.

To help you through the process we are going to lay two basic rules for View coding happiness: • The View should encapsulate a DOM element • Integrate Views with observers So let's see how they work individually. The View should encapsulate a DOM element As mentioned earlier, a View is the behavior associated with a DOM element, so it makes sense to have this element related to the View. A good pattern is to pass a CSS selector in the View instantiation that indicates the element to which it should refer.

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Jasmine JavaScript Testing by Paulo Ragonha

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