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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Testing Best Practices - Prototype</title>
<meta name="author" content="Tony Brimeyer">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style"
content="black-translucent" />
<link rel="stylesheet" href="css/reveal.min.css">
<link rel="stylesheet" href="css/theme/sky.css">
<!-- For syntax highlighting -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!-- If the query includes 'print-pdf', use the PDF print sheet -->
<script>
document.write('<link rel="stylesheet" href="css/print/'
+ (window.location.search.match(/print-pdf/gi) ? 'pdf' : 'paper')
+ '.css" type="text/css" media="print">');
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</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h2>group discussion</h2>
<h4>testing</h4>
</section>
<section>
<h2>who are we...</h2>
</section>
<section>
<h2>...and what are we doing here?</h2>
</section>
<section>
<h2>Goals:</h2>
</section>
<section>
<h3>create "testable" code</h3>
<pre>
<code class="java">TestableCode instanceof GoodCode == false</code>
</pre>
...but
<pre> <code class="java">GoodCode instanceof TestableCode == true</code>
</pre>
</section>
<section>
<h3>developer workflow</h3>
Integrating testing into the development workflow
</section>
<section>
<h3>tools</h3>
<img src="img/toolbox.jpg">
</section>
<section>
<img src="img/koala.jpg">
</section>
<section>
<section>
<h2>create "testable" code</h2>
<a
href="http://misko.hevery.com/attachments/Guide-Writing%20Testable%20Code.pdf">Google
Engineer's Guide to Writing testable code</a>
</section>
<section>
<h3>problem: class does too much</h3>
<h4>why that’s bad:</h4>
<ul>
<li>Hard to debug</li>
<li>Hard to test</li>
<li>Non-extensible system</li>
<li>Difficult for new resources and hard to hand off</li>
</ul>
</section>
<section>
<h3>problem: class does too much</h3>
<h4>why that’s bad:</h4>
<ul>
<li>Not subject to altering behavior via standard mechanisms:
decorator, strategy, subclassing: you end up adding another
conditional test</li>
<li>Hard to give a name to describe what the class does.
Whenever struggling with a name, the code is telling you that the
responsibilities are muddled. When objects have a clear name, it
is easy to keep them focused and shear off any excess baggage.</li>
</ul>
</section>
<section>
<h3>problem: class does too much</h3>
<h4>how to tell</h4>
Try to sum up what a class does in a single phrase. If this phrase
includes “AND” it’s probably doing too much.
</section>
<section>
<h3>solution: class does too much</h3>
<h4>
Class-responsibility-collaboration <b>(CRC)</b> card
</h4>
<img src="img/crc_card.png">
<p>"If it fits, it ships!"</p>
</section>
<section>
<h3>solution: class does too much</h3>
<h4>Reduce Cyclomatic Complexity: Number of paths through a
code base</h4>
<ul>
<li>Higher complexity is harder to test</li>
<li>High complexity is tied to low cohesion (degree to which
the elements of a module belong together.)</li>
</ul>
<img src="img/cc.png">
</section>
<section>
<h3>problem: constructor does real work</h3>
<img src="img/di_code.png">
</section>
<section>
<h3>solution: constructor does real work</h3>
<h4>Dependency Injection</h4>
Outside the scope of what we want to talk about... (but look at
Spring and Guice).
</section>
<section>
<h3>moe money moe problems?</h3>
Continue to look at PDF
</section>
</section>
<section>
<section>
<h2>developer workflow</h2>
<h3>modifying workflow to encourage testing</h3>
<ul>
<li class="fragment">start thinking about features in the
context of "how do we test that??"</li>
<li class="fragment">
<b>think outside the container:</b> You don’t need to start the
Web container to run code (even database code)!
</li>
</ul>
</section>
<section>
<h2>developer workflow</h2>
<ul>
<li class="fragment"><b>business logic tests:</b> Fast,
Repeatable (automatable??)</li>
<li class="fragment"><b>database CRUD tests:</b> Slow,
Unrepeatable (non-automatable??)</li>
</ul>
</section>
</section>
<section>
<h2>tools</h2>
<h3>right tool for the right job</h3>
<ul>
<li class="fragment">JUnit</li>
<li class="fragment">Mockito/PowerMock</li>
<li class="fragment">EclEmma <br/><img class="fragment" src="img/emma.png"/></li>
</ul>
</section>
<section>
<h1>further discussion/moving forward</h1>
</section>
<section>
<h1>thank you!</h1>
</section>
</div>
</div>
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