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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Test-driven development</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
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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>
<h1>Test-driven development</h1>
<p>
<small><a href='mailto:[email protected]'>Max Brauer</a></small>
</p>
</section>
<section>
<h2>About me</h2>
<p>
studied computer science
</p>
<p>
Python developer
</p>
<p>
working at Delivery Hero
</p>
<p>
<a href='http:https://www.github.com/mamachanko'>@mamachanko</a>
</p>
</section>
<section>
<h2>Two axioms</h2>
<p class="fragment">
We want to write software
</p>
<p class="fragment">
We want to assert that it does what it's supposed to
</p>
</section>
<section>
<h2>Software testing</h2>
<p>
manual testing
</p>
<p>
automated testing
</p>
</section>
<section>
<h2>Humans are...</h2>
<p class="fragment">
extremely powerful testers
</p>
<p class="fragment">
very slow testers
</p>
<p class="fragment">
very unprecise
</p>
<p class="fragment">
easily bored
</p>
<p class="fragment">
very expensive
</p>
</section>
<section>
<h2>Machines are...</h2>
<p class="fragment">
very fast testers
</p>
<p class="fragment">
very precise testers
</p>
<p class="fragment">
hard to set up & maintain
</p>
<p class="fragment">
never bored...
</p>
</section>
<section>
<h2>Python toolbox</h2>
<p class="fragment">
to the Python shell!
</p>
</br>
<p class="fragment">
the possibilities are endless...</br>
<code><=</code></br>
<code>>=</code></br>
<code>!=</code></br>
<code>%</code></br>
<code>assert</code></br>
<code>...</code></br>
</p>
</br>
<p class="fragment">
... but we don't want/need to reinvent the wheel!
</p>
</section>
<section>
<h2><code>unittest</code></h2>
<p>
the classic testing framework
</p>
<p>
everything one needs
</p>
<p>
quasi standard
</p>
<p>
built-in
</p>
</br>
<p class="fragment">
"code or it didn't happen!"
<p>
</section>
<section>
<h2>Test-driven development</h2>
<p>
a special school of testing/programming
</p>
<p class="fragment">
what's the difference?
</p>
<h1 class="fragment">
TESTS COME FIRST.
</h1>
<h1 class="fragment">
NO MATTER WHAT.
</h1>
</section>
<section>
<h2>Why's is this a big thing?</h2>
<p>
tests after are justification
</p>
<p>
tests first are challenge
</p>
</br>
<p>
stress requirements
</p>
<p>
how to test
</p>
<p>
good design emerges
</p>
<p>
minimalism
</p>
</section>
<section>
<h2>the three laws of tdd</h2>
<small>
as by Robert C. Martin
</small>
</br>
</br>
<ol>
<li class="fragment">you may not write any production code without a failing test
</li>
</br>
<li class="fragment">you may not write more of a test than is sufficient to fail
</li>
</br>
<li class="fragment">you may not write more production code than is sufficient to pass
</li>
</ol>
</br>
</br>
<p class="fragment">
test</br>
code</br>
refactor</br>
repeat</br>
</p>
</section>
<section>
<h2>But why??</h2>
<p>
it emphasizes the process
</p>
<p>
helps you understand requirements
</p>
<p>
you will think about fringe cases early
</p>
<p>
breaks problems into manageable units
</p>
<p>
tests serve as documentation
</p>
<p>
good design emerges
</p>
</br>
<small class="fragment">but most of all:</small>
<h3 class="fragment">
It gives you safety.
</h3>
</section>
<section>
<h2>Why not?</h2>
<p>
not easy to understand
</p>
<p>
writing good tests is hard
</p>
<p>
you need to be very disciplined
</p>
<p>
you need to excercise a lot with Katas
</p>
</section>
<section>
<p class="fragment">
Thanks!
</br>
</br>
<small>
Break first!</br>
Katas after!
</small>
</p>
</section>
<section>
<h2>links</h2>
<p>
<a href="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/mamachanko/tdd-talk">these slides</a>
</p>
<p>
<a href="http:https://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd">The three rules of TDD</a>
</p>
<p>
<a href="http:https://docs.python.org/2/library/unittest.html">Python's unittest documentation</a>
</p>
<p>
<a href="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/garora/TDD-Katas">TDD katas</a>
</p>
</section>
</div>
</div>
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