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added a little food thought about testing

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Julio Biason 6 years ago
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Filosofando sobre Tests</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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.happy {
color: yellow;
}
.reveal section img {
border: none;
}
.reveal ul.empty {
list-style: none outside;
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li {
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</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<!-- <section data-background="_images/tdd-kentbeck-book.jpg" data-header> -->
<section data-background="_images/tdd-kentbeck-book.jpg">
<h1 class="semi-opaque">Filosofando sobre Testes</h1>
</section>
</section>
<section>
<section>
<img src="_images/avatar-20170726.png" alt="Me" style="float:left;width:200px;" class="no-border">
<div>
<ul class="empty">
<li>Júlio Biason</li>
<li>Azion Technologies<img src="_images/azion-logo.png" alt="Azion logo" class='company-logo'></li>
<li>@juliobiason</li>
<li>https://functional.cafe/@juliobiason</li>
<li>julio.biason@gmail.com</li>
<li><a href="http://presentations.juliobiason.net">http://presentations.juliobiason.net</a></li>
</ul>
</div>
</section>
<section>
<img src="_images/start-a-fight.jpg" alt="Eu faço perguntas em reuniões que eu não sei nada e reunião explode; não é de propósito" class='stretch'/>
<aside class="notes">
Eu sou famoso (ou era) por entrar eu reuniões, fazer uma
pergunta e a reunião explodir em discussões (úteis, diga-se
de passagem). Mas eu não fazia isso de propósito.
</aside>
</section>
<section>
<img src="_images/mini-hitler.jpg" alt="Me chamaram de Mini Hitler"/>
</section>
<section>
<img src="_images/filho-do-capeta.jpg" alt="... mas hoje eu vim botar os filho dos outro no go horse." class='stretch'/>
<aside class="notes">
... mas hoje eu vim "botá os fio dos otro no Go Horse, fazê
eles escrevê menos teste"
</aside>
</section>
<section>
<h2><span style="color:red">WARNING</span></h2>
<img src="_images/patriarch.jpg" alt="... e eu sou meio não-ortodoxo sobre testes."/>
</section>
</section>
<section>
<section>
<img src="_images/tdd-where-it-went-wrong.png" alt="TDD: Where it went wrong" class="stretch"/>
<p>Ian Cooper: <a href="https://vimeo.com/68375232">"TDD, where did it all go wrong"</a></p>
</section>
<section>
<h2>TDD</h2>
<p>Kent Beck:</p>
<ul>
<li>"Run in isolation", nothing more, nothing less.</li>
<li>"Avoid testing implementation details, test behaviours"</li>
</ul>
</section>
<section>
<h2>TDD</h2>
<p>Discussões como "qual a unidade a ser testada" é que geraram
coisas como BDD e ATDD (Acceptance Test-Driven Development).</p>
</section>
<section>
<h2>TDD</h2>
<p>Reddit: <a href="https://www.reddit.com/r/django/comments/5bearg/should_i_write_unit_tests_for_djangos_built_in/" target="_blank">Devo escrever testes para a validação interna do Django?</a></p>
<h1 class="fragment">SIM!</h1>
</section>
<section>
<h2>TDD</h2>
<p>Nossos testes End-to-End.</p>
<aside class="notes">
Explicação do que aconteceu com os testes do gerenciador de alertas.
</aside>
</section>
</section>
<section>
<section>
</section>
</section>
<section>
<section>
<h2>Exemplo</h2>
<pre><code class="python">
class Client:
def __init__(self, name):
self.name = name
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<p>Novo requisito: "somente aceitar nomes válidos, que tem 2
palavras ou mais."</p>
</section>
<section>
<h2>Exemplo</h2>
<p>SOLID principles:</p>
<ul>
<li><strong>SRP - Single Responsability Principle</strong></li>
<li>OCP - Open/closed principle</li>
<li>LSP - Liskov substitution principle (design by contract)</li>
<li>ISP - Interface Segreation Principle</li>
<li>DIP - Dependency Inversion Principle</li>
</ul>
</section>
<section>
<h2>Exemplo</h2>
<pre><code class="python">
def _multiple_names(name):
split_names = name.split(' ')
return len(split_names) > 1
def _validate_name(name):
if not _multiple_names(name):
raise Exception("Invalid name")
return name
class Client:
def __init__(self, name):
self.name = _validate_name(name)
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<pre><code class="python">
import pytest
def test_single_name():
assert not _multiple_names('Cher')
def test_multiple_name():
assert _multiple_names('Julio Biason')
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<pre><code class="python">
def test_valid_name():
_validate_name('Julio Biason')
def test_invalid_name():
with pytest.raises(Exception):
_validate_name('Cher')
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<pre><code class="python">
def test_client_error():
with pytest.raises(Exception):
Client(name='Cher')
def test_client():
Client(name='Julio Biason')
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<pre><code>
$ pytest client.py
==== test session starts ====
rootdir: /home/jbiason/unitt, inifile:
collected 6 items
client.py ......
==== 6 passed in 0.03 seconds ====
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<pre><code>
$ pytest --cov=client client.py
==== test session starts ====
plugins: cov-2.4.0
collected 6 items
client.py ......
---- coverage: platform linux, python 3.4.3-final-0 ----
Name Stmts Miss Cover
-------------------------------
client.py 25 0 100%
==== 6 passed in 0.11 seconds ====
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<p>"Não podemos perder a Cher, a Xuxa, a Madonna, a Björk e o String como clientes!"</p>
</section>
<section>
<h2>Exemplo</h2>
<pre><code class="python">
class Client:
def __init__(self, name):
self.name = name
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<pre><code>
==== FAILURES ====
____ test_client_error ____
def test_client_error():
with pytest.raises(Exception):
&gt; Client(name='Cher')
E Failed: DID NOT RAISE &lt;class 'Exception'>
client.py:37: Failed
==== 1 failed, 5 passed in 0.63 seconds ====
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<pre><code>
$ pytest client.py
==== test session starts ====
rootdir: /home/jbiason/unitt, inifile:
plugins: cov-2.4.0
collected 6 items
client.py ......
==== 6 passed in 0.03 seconds ====
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<pre><code>
$ pytest --cov=client client.py
==== test session starts ====
rootdir: /home/jbiason/unitt, inifile:
plugins: cov-2.4.0
collected 6 items
client.py ......
---- coverage: platform linux, python 3.4.3-final-0 ----
Name Stmts Miss Cover
-------------------------------
client.py 24 0 100%
==== 6 passed in 0.12 seconds ====
</code></pre>
</section>
<section>
<h2>Exemplo</h2>
<p>Encontre o erro.</p>
</section>
</section>
<section>
<h2>Resumo</h2>
<ul>
<li>Escreva testes que verifiquem requisitos, não a
implementação do requisito</li>
<li>Implementação pode mudar, os testes não deveriam.</li>
<li>Garanta que o teste dependa apenas de si mesmo
e não de outros testes.</li>
<li>Use cobertura (coverage) para identificar código
a ser removido, não para escrever mais testes.</li>
</ul>
</section>
<section data-background='_images/thats-all-folks.jpg'>
<section>
<h1 class="fragment semi-opaque">Perguntas?</h1>
</section>
</section>
</div>
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