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442 lines
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442 lines
15 KiB
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<title>"Unit" em "Unit Tests"</title> |
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<meta name="author" content="Hakim El Hattab"> |
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</head> |
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<body> |
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<div class="reveal"> |
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<div class="slides"> |
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<section> |
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<section data-background="_images/tdd-kentbeck-book.jpg" data-header> |
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<h1 class="semi-opaque">"Unit" em "Unit Tests"</h1> |
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</section> |
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</section> |
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<section> |
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<section> |
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<img src="_images/avatar-20170726.png" alt="Me" style="float:left;width:200px;" class="no-border"> |
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<div> |
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<ul class="empty"> |
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<li>Júlio Biason</li> |
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<li>@juliobiason</li> |
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<li>julio.biason@gmail.com</li> |
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<li><a href="http://presentations.juliobiason.net">http://presentations.juliobiason.net</a></li> |
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</ul> |
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</div> |
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</section> |
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<section> |
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<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'/> |
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<aside class="notes"> |
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Eu sou famoso (ou era) por entrar eu reuniões, fazer uma |
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pergunta e a reunião explodir em discussões (úteis, diga-se |
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de passagem). Mas eu não fazia isso de propósito. |
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</aside> |
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</section> |
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<section> |
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<img src="_images/filho-do-capeta.jpg" alt="... mas hoje eu vim botar os filho dos outro no go horse." class='stretch'/> |
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<aside class="notes"> |
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... mas hoje eu vim "botá os fio dos otro no Go Horse, fazê |
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eles escrevê menos teste" |
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</aside> |
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</section> |
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</section> |
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<section> |
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<section> |
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<img src="_images/tdd-where-it-went-wrong.png" alt="TDD: Where it went wrong" class="stretch"/> |
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<p>Ian Cooper: <a href="https://vimeo.com/68375232">"TDD, where did it all go wrong"</a></p> |
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</section> |
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<section> |
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<p>Apresentação de Ian Cooper ressoou muito com experiências |
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feitas com TDD puro e "testes de ponta-a-ponta".</p> |
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</section> |
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</section> |
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<section> |
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<section> |
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<p>Mas antes...</p> |
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</section> |
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<section> |
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<p>Quem já...</p> |
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<ul class="empty"> |
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<li class="fragment">... falou de "testes de unidade"?</li> |
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<li class="fragment">... discutiu a "unidade" dos testes de unidade?</li> |
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</ul> |
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</section> |
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<section> |
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<img src="_images/faustao-arrow.png" alt="Errow" class="stretch"/> |
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</section> |
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<section> |
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<img src="_images/errou-rude.png" alt="Errou rude" class="stretch"/> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code class="python"> |
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class Client: |
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def __init__(self, name): |
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self.name = name |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<p>Novo requisito: "somente aceitar nomes válidos, que tem 2 |
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palavras ou mais."</p> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<p>SOLID principles:</p> |
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<ul> |
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<li><strong>SRP - Single Responsability Principle</strong></li> |
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<li>OCP - Open/closed principle</li> |
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<li>LSP - Liskov substitution principle (design by contract)</li> |
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<li>ISP - Interface Segreation Principle</li> |
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<li>DIP - Dependency Inversion Principle</li> |
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</ul> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code class="python"> |
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def _multiple_names(name): |
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split_names = name.split(' ') |
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return len(split_names) > 1 |
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def _validate_name(name): |
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if not _multiple_names(name): |
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raise Exception("Invalid name") |
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return name |
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class Client: |
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def __init__(self, name): |
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self.name = _validate_name(name) |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code class="python"> |
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import pytest |
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def test_single_name(): |
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assert not _multiple_names('Cher') |
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def test_multiple_name(): |
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assert _multiple_names('Julio Biason') |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code class="python"> |
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def test_valid_name(): |
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_validate_name('Julio Biason') |
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def test_invalid_name(): |
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with pytest.raises(Exception): |
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_validate_name('Cher') |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code class="python"> |
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def test_client_error(): |
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with pytest.raises(Exception): |
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Client(name='Cher') |
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def test_client(): |
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Client(name='Julio Biason') |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code> |
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$ pytest client.py |
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==== test session starts ==== |
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rootdir: /home/jbiason/unitt, inifile: |
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collected 6 items |
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client.py ...... |
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==== 6 passed in 0.03 seconds ==== |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code> |
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$ pytest --cov=client client.py |
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==== test session starts ==== |
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plugins: cov-2.4.0 |
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collected 6 items |
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client.py ...... |
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---- coverage: platform linux, python 3.4.3-final-0 ---- |
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Name Stmts Miss Cover |
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------------------------------- |
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client.py 25 0 100% |
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==== 6 passed in 0.11 seconds ==== |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<p>"Não podemos perder a Cher, a Xuxa, a Madonna, a Björk e o String como clientes!"</p> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code class="python"> |
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class Client: |
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def __init__(self, name): |
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self.name = name |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code> |
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==== FAILURES ==== |
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____ test_client_error ____ |
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def test_client_error(): |
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with pytest.raises(Exception): |
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> Client(name='Cher') |
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E Failed: DID NOT RAISE <class 'Exception'> |
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client.py:37: Failed |
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==== 1 failed, 5 passed in 0.63 seconds ==== |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code> |
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$ pytest client.py |
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==== test session starts ==== |
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rootdir: /home/jbiason/unitt, inifile: |
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plugins: cov-2.4.0 |
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collected 6 items |
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client.py ...... |
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==== 6 passed in 0.03 seconds ==== |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<pre><code> |
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$ pytest --cov=client client.py |
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==== test session starts ==== |
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rootdir: /home/jbiason/unitt, inifile: |
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plugins: cov-2.4.0 |
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collected 6 items |
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client.py ...... |
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---- coverage: platform linux, python 3.4.3-final-0 ---- |
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Name Stmts Miss Cover |
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------------------------------- |
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client.py 24 0 100% |
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==== 6 passed in 0.12 seconds ==== |
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</code></pre> |
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</section> |
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<section> |
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<h2>Exemplo</h2> |
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<p>Encontre o erro.</p> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>TDD</h2> |
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<p>Kent Beck:</p> |
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<ul> |
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<li>"Run in isolation", nothing more, nothing less.</li> |
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<li>"Avoid testing implementation details, test behaviours"</li> |
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</ul> |
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</section> |
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<section> |
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<h2>TDD</h2> |
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<p>Discussões como "qual a unidade a ser testada" é que geraram |
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coisas como BDD e ATDD (Acceptance Test-Driven Development).</p> |
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</section> |
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<section> |
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<h2>TDD</h2> |
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<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> |
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<h1 class="fragment">SIM!</h1> |
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</section> |
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<section> |
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<h2>TDD</h2> |
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<p>Nossos testes End-to-End.</p> |
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<aside class="notes"> |
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Explicação do que aconteceu com os testes do gerenciador de alertas. |
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</aside> |
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</section> |
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<section> |
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<h2>TDD</h2> |
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<img src="_images/tdd-lifecycle.png" alt="The TDD lifecycle" class="stretch"> |
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</section> |
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<section> |
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<h2>TDD</h2> |
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<p>SOLID principles:</p> |
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<ul> |
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<li>SRP - Single Responsability Principle</li> |
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<li>OCP - Open/closed principle</li> |
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<li><strong>LSP - Liskov substitution principle (design by contract)</strong></li> |
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<li>ISP - Interface Segreation Principle</li> |
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<li>DIP - Dependency Inversion Principle</li> |
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</ul> |
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<p>Funciona para aplicações inteiras; veja VIM vs NeoVim.</p> |
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</section> |
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</section> |
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<section> |
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<h2>Resumo</h2> |
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<ul> |
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<li>Escreva testes que verifiquem requisitos, não a |
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implementação do requisito</li> |
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<li>Implementação pode mudar, os testes não deveriam.</li> |
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<li>Garanta que o teste dependa apenas de si mesmo |
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e não de outros testes.</li> |
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<li>Use cobertura (coverage) para identificar código |
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a ser removido, não para escrever mais testes.</li> |
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</ul> |
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</section> |
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<section data-background='_images/thats-all-folks.jpg'> |
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<section> |
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<h1 class="fragment semi-opaque">Perguntas?</h1> |
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</section> |
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</section> |
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</div> |
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