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        <title>"Unit" em "Unit Tests"</title>

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                <section>
                    <section>
                        <h1 class="semi-opaque">"Unit" em "Unit Tests"</h1>
                    </section>
                </section>

                <section>
                    <section>
                        <img src="_images/AYV1X0yv.png" alt="Me" style="float:left;width:300px;" class="no-border">

                        <div>
                            <ul class="empty">
                                <li>Júlio Biason</li>
                                <li><img src="_images/logo-horizontal-claro.png" alt="CWI Software" class='no-border'>
                                <li>@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'/>
                    </section>

                    <section>
                        <img src="_images/filho-do-capeta.jpg" alt="... mas hoje eu vim botar os filho dos outro no go horse." class='stretch'/>
                    </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>
                        <p>Apresentação de Ian Cooper ressoou muito com experiências
                        feitas com TDD puro e "testes de ponta-a-ponta".</p>
                    </section>
                </section>

                <section>
                    <section>
                        <p>Mas antes...</p>
                    </section>

                    <section>
                        <p>Quem já...</p>
                        <ul class="empty">
                            <li class="fragment">... falou de "testes de unidade"?</li>
                            <li class="fragment">... discutiu a "unidade" dos testes de unidade?</li>
                        </ul>
                    </section>

                    <section>
                        <img src="_images/faustao-arrow.png" alt="Errow" class="stretch"/>
                    </section>

                    <section>
                        <img src="_images/errou-rude.png" alt="Errou rude" class="stretch"/>
                    </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>
                    <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>
                        <h2>TDD</h2>

                        <img src="_images/tdd-lifecycle.png" alt="The TDD lifecycle" class="stretch">
                    </section>

                    <section>
                        <h2>TDD</h2>

                        <p>SOLID principles:</p>
                        <ul>
                            <li>SRP - Single Responsability Principle</li>
                            <li>OCP - Open/closed principle</li>
                            <li><strong>LSP - Liskov substitution principle (design by contract)</strong></li>
                            <li>ISP - Interface Segreation Principle</li>
                            <li>DIP - Dependency Inversion Principle</li>
                        </ul>

                        <p>Funciona para aplicações inteiras; veja VIM vs NeoVim.</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>
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