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completed the philosophy of test

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Julio Biason 6 years ago
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      filosofando-testes.html

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@ -55,7 +55,7 @@
<div class="reveal"> <div class="reveal">
<div class="slides"> <div class="slides">
<section> <section>
<!-- <section data-background="_images/tdd-kentbeck-book.jpg" data-header> --> <!-- <section data-header> -->
<section data-background="_images/tdd-kentbeck-book.jpg"> <section data-background="_images/tdd-kentbeck-book.jpg">
<h1 class="semi-opaque">Filosofando sobre Testes</h1> <h1 class="semi-opaque">Filosofando sobre Testes</h1>
</section> </section>
@ -107,6 +107,17 @@
</section> </section>
</section> </section>
<section>
<h2>Agenda:</h2>
<ul>
<li>TDD Kent Beck Style.</li>
<li>Fast Test, Slow Tests.</li>
<li>Explosão de testes.</li>
<li>Coverage.</li>
</ul>
</section>
<section> <section>
<section> <section>
<img src="_images/tdd-where-it-went-wrong.png" alt="TDD: Where it went wrong" class="stretch"/> <img src="_images/tdd-where-it-went-wrong.png" alt="TDD: Where it went wrong" class="stretch"/>
@ -137,6 +148,8 @@
<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> <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> <h1 class="fragment">SIM!</h1>
<p class="fragment">... bom, talvez sim.</p>
</section> </section>
<section> <section>
@ -152,13 +165,109 @@
<section> <section>
<section> <section>
<img src="_images/tdd-fast-test-slow-test.png" alt="" class="stretch"/>
<p>Gary Bernhardt: <a href="https://www.youtube.com/watch?v=RAxiiRPHS9k" target="_blank">Fast Test, Slow Test</a></p>
</section>
<section>
<img src="_images/tdd-fast-test-slow-test-2.png" alt=""/ class="stretch">
</section>
<section>
<h2>Fast Test, Slow Test</h2>
<ul>
<li>Testar modelos.</li>
<li>Testar views.</li>
<li>Testar controllers.</li>
</ul>
<p class="fragment">... soa familiar?</p>
</section>
<section>
<h2>Fast Test, Slow Test</h2>
<ul>
<li>Desenvolvedores podem testar, rapidamente, suas alterações.</li>
<li>Não significa que testes de integração não são necessários,
mas estes podem ser rodados no CI.</li>
</ul>
<p class="fragment">... continua soando familiar?</p>
</section>
<section>
<h2>Fast Test, Slow Test</h2>
<p>Qual o valor desse teste para o meu projeto?</p>
</section>
<section>
<h2>Fast Test, Slow Test</h2>
<p>Se eu estou escrevendo testes do meu modelo sem
que seja integrado com o meu controller, eu estou
testando o que?</p>
<p class="fragment"><u>Aderência a arquitetura do projeto</u>.</p>
</section>
<section>
<h2>Fast Test, Slow Test</h2>
<p>Se o teste que verifica a funcionalidade para
o usuário (integração) produz mais valor
que o teste que garante a aderência do projeto à
uma arquitetura, qual teste deve ser rodado
primariamente?</p>
</section>
</section>
<section>
<section>
<h2>A Explosão dos Testes Lentos</h2>
</section>
<section>
<h2>Explosão de Testes Lentos</h2>
<p>"Testes de integração são lentos, então eu tenho que rodar-los
menos ou ter menos desses testes."</p>
</section>
<section>
<h2>Explosão de Testes Lentos</h2>
<ul>
<li>Rode apenas o teste da alteração que está sendo feita.</li>
<li class="fragment">Rode os testes relacionados.</li>
<li class="fragment">Deixe todos os demais testes para o CI.</li>
</ul>
</section> </section>
</section> </section>
<section> <section>
<section>
<h2>Coverage</h2>
</section>
<section>
<h2>Coverage</h2>
<p>Se os testes indicam quais funcionalidades devem estar
presentes...</p>
<p class="fragment">... coverage vai indicar quais partes
de código não tem nada a ver com as funcionalidades que
vão ser entregues.</p>
</section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code class="python"> <pre><code class="python">
class Client: class Client:
@ -168,27 +277,16 @@ class Client:
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<p>Novo requisito: "somente aceitar nomes válidos, que tem 2 <p>Novo requisito: "somente aceitar nomes válidos, que tem 2
palavras ou mais."</p> palavras ou mais."</p>
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<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"> <pre><code class="python">
def _multiple_names(name): def _multiple_names(name):
@ -207,7 +305,8 @@ class Client:
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code class="python"> <pre><code class="python">
import pytest import pytest
@ -221,7 +320,8 @@ def test_multiple_name():
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code class="python"> <pre><code class="python">
def test_valid_name(): def test_valid_name():
@ -234,7 +334,8 @@ def test_invalid_name():
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code class="python"> <pre><code class="python">
def test_client_error(): def test_client_error():
@ -247,7 +348,8 @@ def test_client():
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code> <pre><code>
$ pytest client.py $ pytest client.py
@ -262,7 +364,8 @@ client.py ......
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code> <pre><code>
$ pytest --cov=client client.py $ pytest --cov=client client.py
@ -282,13 +385,15 @@ client.py 25 0 100%
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<p>"Não podemos perder a Cher, a Xuxa, a Madonna, a Björk e o String como clientes!"</p> <p>"Não podemos perder a Cher, a Xuxa, a Madonna, a Björk e o String como clientes!"</p>
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code class="python"> <pre><code class="python">
class Client: class Client:
@ -298,7 +403,8 @@ class Client:
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code> <pre><code>
==== FAILURES ==== ==== FAILURES ====
@ -315,7 +421,8 @@ client.py:37: Failed
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code> <pre><code>
$ pytest client.py $ pytest client.py
@ -331,7 +438,8 @@ client.py ......
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<pre><code> <pre><code>
$ pytest --cov=client client.py $ pytest --cov=client client.py
@ -352,29 +460,35 @@ client.py 24 0 100%
</section> </section>
<section> <section>
<h2>Exemplo</h2> <h2>Coverage</h2>
<h3>Exemplo</h3>
<p>Encontre o erro.</p> <p>Encontre o erro.</p>
</section> </section>
</section>
<section> <section>
<h2>Resumo</h2> <h2>Coverage</h2>
<ul> <p>100% de cobertura de testes é possível.</p>
<li>Escreva testes que verifiquem requisitos, não a
implementação do requisito</li> <p class="fragment">... desde que esteja disposto a escrever
<li>Implementação pode mudar, os testes não deveriam.</li> código que testa funcionalidades do usuário e não conformidade
<li>Garanta que o teste dependa apenas de si mesmo de arquitetura e código não coberto seja apagado.</p>
e não de outros testes.</li> </section>
<li>Use cobertura (coverage) para identificar código
a ser removido, não para escrever mais testes.</li>
</ul>
</section> </section>
<section data-background='_images/thats-all-folks.jpg'> <section data-background='_images/thats-all-folks.jpg'>
<section> <section>
<h1 class="fragment semi-opaque">Perguntas?</h1> <h1 class="fragment semi-opaque">Perguntas?</h1>
<div class="fragment semi-opaque">
<ul>
<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>
</section> </section>
</div> </div>

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