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< title > Filosofando sobre Tests< / title >
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< meta name = "author" content = "Hakim El Hattab" >
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< section >
< section data-background = "_images/tdd-kentbeck-book.jpg" data-header >
< 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 > @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 >
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< / 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 >
< 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 >
< 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 >
< p class = "fragment" > ... bom, talvez sim.< / p >
< / 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 >
< 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 >
< 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 >
< h2 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< pre > < code class = "python" >
class Client:
def __init__(self, name):
self.name = name
< / code > < / pre >
< / section >
< section >
< h2 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< p > Novo requisito: "somente aceitar nomes válidos, que tem 2
palavras ou mais."< / p >
< / section >
< section >
< h2 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< 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 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< 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 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< 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 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< 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 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< 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 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< 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 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< p > "Não podemos perder a Cher, a Xuxa, a Madonna, a Björk e o String como clientes!"< / p >
< / section >
< section >
< h2 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< pre > < code class = "python" >
class Client:
def __init__(self, name):
self.name = name
< / code > < / pre >
< / section >
< section >
< h2 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< pre > < code >
==== FAILURES ====
____ test_client_error ____
def test_client_error():
with pytest.raises(Exception):
> Client(name='Cher')
E Failed: DID NOT RAISE < class 'Exception'>
client.py:37: Failed
==== 1 failed, 5 passed in 0.63 seconds ====
< / code > < / pre >
< / section >
< section >
< h2 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< 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 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< 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 > Coverage< / h2 >
< h3 > Exemplo< / h3 >
< p > Encontre o erro.< / p >
< / section >
< section >
< h2 > Coverage< / h2 >
< p > 100% de cobertura de testes é possível.< / p >
< p class = "fragment" > ... desde que esteja disposto a escrever
código que testa funcionalidades do usuário e não conformidade
de arquitetura e código não coberto seja apagado.< / p >
< / section >
< / section >
< section data-background = '_images/thats-all-folks.jpg' >
< section >
< 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 >
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