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<title>BDD em Python</title>
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<meta name="description" content="Colocando uma aplicação Flask em produção em 40 minutos (ou menos)">
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<meta name="author" content="Julio Biason">
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<section>
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<section data-background="_images/bdd.jpg" data-header>
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<h1 class="semi-opaque">
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BDD em Python
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</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="https://presentations.juliobiason.me">https://presentations.juliobiason.me</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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<section>
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<section>
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<img src="_images/bdd-robot.png" alt="" style="background-color:black"/>
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<img src="_images/bdd-behave.png" alt=""/>
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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>Gherkin</h2>
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<p style="text-align:left">
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Given <span class="fragment">Definição do ambiente</span> <br/>
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When <span class="fragment">O teste</span><br/>
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Then <span class="fragment">Validação do teste</span><br/>
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</p>
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<aside class="notes">
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Esse é o formato do "Gherkin", popularizado pelo framework
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"Cucumber" de Ruby.
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"Given" define o ambiente do teste; "Dado que" (eu tenho isso)...
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"When" define o teste em si; "quando" (... eu fizer essa coisa)...
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"Then" define a validação; "então" (... isso deve ter acontecido)
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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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<h2>Código sendo testado</h2>
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<pre><code>#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""This is a sample code that simulates a user being created."""
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from __future__ import print_function
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import argparse
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import json
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from collections import Counter
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from unicodedata import category
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LOWERCASE_CHARS = "Ll"
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UPCASE_CHARS = "Lu"
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NUMBERS = "Nd"
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class UserCreationError(Exception):
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"""Base class for all exceptions in this module."""
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pass
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class PasswordIsNotStrongEnough(UserCreationError):
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"""The password used is not strong enough."""
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pass
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class UserAlreadyExists(UserCreationError):
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"""The user already exists in the database."""
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pass
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def password_is_strong(password):
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"""Check if the password have enough strength."""
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number_of = Counter(category(ch) for ch in password)
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return (number_of[LOWERCASE_CHARS] >= 1 and
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number_of[UPCASE_CHARS] >= 2 and
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number_of[NUMBERS] >= 1 and
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len(password) >= 12)
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def get_users():
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"""Retrieve the list of users in the system."""
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data = {}
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try:
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with open('users.json') as origin:
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data = json.load(origin)
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except IOError:
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# File does not exist, so we just assume it's empty
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pass
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return data
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def save_users(user_list):
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"""Save the user list back to the 'database'."""
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with open('users.json', 'w') as target:
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json.dump(user_list, target)
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return
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def create_user(user, password):
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"""'Create' and user."""
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if not password_is_strong(password.decode('utf-8')):
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raise PasswordIsNotStrongEnough
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users = get_users()
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if user in users:
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raise UserAlreadyExists
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users[user] = password
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save_users(users)
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return
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def main():
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"""Expose the functions back in command line options."""
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parser = argparse.ArgumentParser()
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parser.add_argument('-u', '--user',
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dest='user',
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help='Username to be created',
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required=True)
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parser.add_argument('-p', '--password',
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dest='password',
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help='Password for the user',
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required=True)
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args = parser.parse_args()
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try:
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create_user(args.user, args.password)
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except PasswordIsNotStrongEnough:
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print("That password is not strong enough")
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except UserAlreadyExists:
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print("Username already used")
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else:
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print("User created")
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return
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if __name__ == "__main__":
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main()</code></pre>
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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>Robot Framework</h2>
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<p><code>pip install robotframework</code></p>
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<ul>
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<li>Componentes começam com <code>***</code></li>
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<li>
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Contém elementos de:
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<ul>
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<li>Settings: Configuração do ambiente do Robot</li>
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<li>Keywords: Novas expressões</li>
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<li>Test Case: Os testes.</li>
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</ul>
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</li>
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</ul>
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</section>
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<section>
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<h2>Robot Framework</h2>
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<pre><code>
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*** Settings ***
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Library TestingSource.py
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*** Test Cases ***
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Invalid password
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Given that I have a username foo
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And that I have a password test123
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When I try to create a user
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Then I should get an error of invalid password
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*** Keywords ***
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That I have a username
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[Arguments] ${username}
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set username ${username}
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That I have a password
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[Arguments] ${password}
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Set password ${password}
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I try to create a user
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Create user
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I should get an error of invalid password
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Is invalid password
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</code></pre>
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</section>
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<section>
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<h2>Robot Framework</h2>
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<pre><code>*** Settings ***
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Library TestingSource.py</code></pre>
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<p>Configuração: Indica que deve ser carregado uma biblioteca em
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Python (a seguir).</p>
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</section>
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<section>
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<h2>Robot Framework</h2>
|
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<pre><code>import mainsource
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class TestingSource(object):
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def __init__(self):
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self.username = None
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self.password = None
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self.last_exception = None
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def set_username(self, username):
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self.username = username
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def set_password(self, password):
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self.password = password
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def create_user(self):
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try:
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mainsource.create_user(self.username, self.password)
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except mainsource.UserCreationError as exc:
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self.last_exception = exc
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def is_invalid_password(self):
|
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|
|
return (self.last_exception and
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|
|
isinstance(self.last_exception,
|
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|
|
|
mainsource.PasswordIsNotStrongEnough))</code></pre>
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|
|
</section>
|
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|
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|
<section>
|
|
|
|
|
<h2>Robot Framework</h2>
|
|
|
|
|
|
|
|
|
|
<pre><code>*** Test Cases ***
|
|
|
|
|
Invalid password
|
|
|
|
|
Given that I have a username foo
|
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|
|
|
And that I have a password test123
|
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|
|
|
When I try to create a user
|
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|
|
|
Then I should get an error of invalid password</code></pre>
|
|
|
|
|
|
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|
<p>
|
|
|
|
|
<code>Given</code>, <code>And</code>, <code>When</code> e
|
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|
|
|
<code>Then</code> são palavras reservadas.
|
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|
|
</p>
|
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<p>
|
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|
|
Parâmetros tem que ser separados com Tabs.
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|
|
</p>
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|
|
</section>
|
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|
<section>
|
|
|
|
|
<h2>Robot Framework</h2>
|
|
|
|
|
|
|
|
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|
<pre><code>*** Keywords ***
|
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|
|
That I have a username
|
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|
|
[Arguments] ${username}
|
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|
|
|
set username ${username}
|
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|
|
|
|
|
|
|
|
That I have a password
|
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|
|
[Arguments] ${password}
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|
|
Set password ${password}
|
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|
|
|
|
|
|
|
|
I try to create a user
|
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|
|
|
Create user
|
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|
|
|
|
|
|
|
|
I should get an error of invalid password
|
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|
|
|
Is invalid password</code></pre>
|
|
|
|
|
</section>
|
|
|
|
|
|
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|
<section>
|
|
|
|
|
<h2>Robot Framework</h2>
|
|
|
|
|
|
|
|
|
|
<pre><code>$ robot example.robot
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==============================================================================
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Example
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==============================================================================
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Invalid password | PASS |
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------------------------------------------------------------------------------
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Example | PASS |
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1 critical test, 1 passed, 0 failed
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1 test total, 1 passed, 0 failed
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==============================================================================
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Output: /Users/juliobiason/personal/presentations/_sources/python-bdd/output.xml
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Log: /Users/juliobiason/personal/presentations/_sources/python-bdd/log.html
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Report: /Users/juliobiason/personal/presentations/_sources/python-bdd/report.html</code></pre>
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</section>
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<section>
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<h2>Robot Framework</h2>
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<p>Vantagens:</p>
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<ul>
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<li>Libraries</li>
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<li>Por causa dos <code>***</code>, testes podem estar
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em vários arquivos -- incluindo RST.</li>
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</ul>
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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>Behave</h2>
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<p><code>pip install behave</code></p>
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<ul>
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<li>Mais simples</li>
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<li>Testes ficam em arquivos <code>.feature</code> (tal qual Cucumber)</li>
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<li>Informações são passadas por <code>context</code></li>
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</ul>
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</section>
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<section>
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<h2>Behave</h2>
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<pre><code>Feature: Testing passwords
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Scenario: Invalid password
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Given that I have a username foo
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And that I have a password test123
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When I try to create an user
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Then I should get an error of invalid password</code></pre>
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</section>
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<section>
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<h2>Behave</h2>
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<pre><code># -*- encoding: utf-8 -*-
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"""Behave steps."""
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import behave
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import mainsource
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@behave.given("that I have a username {name}")
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def set_username(context, name):
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context.username = name
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return
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@behave.given("that I have a password {password}")
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def set_password(context, password):
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context.password = password
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return
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@behave.when("I try to create an user")
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def create_user(context):
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try:
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mainsource.create_user(context.username, context.password)
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except mainsource.UserCreationError as exc:
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context.last_exception = exc
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return
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@behave.then("I should get an error of invalid password")
|
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|
def is_invalid_password(context):
|
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|
|
assert hasattr(context, 'last_exception')
|
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|
assert isinstance(context.last_exception,
|
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|
mainsource.PasswordIsNotStrongEnough)</code></pre>
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</section>
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<section>
|
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<h2>Behave</h2>
|
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|
<pre><code>Feature: Testing passwords # features/example.feature:1
|
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|
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|
Scenario: Invalid password # features/example.feature:3
|
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|
Given that I have a username foo # features/steps/example_steps.py:9 0.001s
|
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|
|
And that I have a password test123 # features/steps/example_steps.py:15 0.000s
|
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|
When I try to create an user # features/steps/example_steps.py:21 0.001s
|
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|
|
Then I should get an error of invalid password # features/steps/example_steps.py:30 0.000s
|
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|
1 feature passed, 0 failed, 0 skipped
|
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|
1 scenario passed, 0 failed, 0 skipped
|
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|
4 steps passed, 0 failed, 0 skipped, 0 undefined
|
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|
Took 0m0.002s </code></pre>
|
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|
</section>
|
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|
<section>
|
|
|
|
|
<h2>Behave</h2>
|
|
|
|
|
|
|
|
|
|
<p>Vantagens:</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
<li>Mais simples</li>
|
|
|
|
|
</ul>
|
|
|
|
|
</section>
|
|
|
|
|
</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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|
</div>
|
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|
<script src="reveal.js/lib/js/head.min.js"></script>
|
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|
<script src="reveal.js/js/reveal.js"></script>
|
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|
<script>
|
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|
|
// Full list of configuration options available at:
|
|
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|
|
// https://github.com/hakimel/reveal.js#configuration
|
|
|
|
|
Reveal.initialize({
|
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|
|
controls: true,
|
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|
|
progress: true,
|
|
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|
|
history: true,
|
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center: true,
|
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|
// showNotes: true,
|
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|
|
transition: 'slide', // none/fade/slide/convex/concave/zoom
|
|
|
|
|
|
|
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|
|
// Optional reveal.js plugins
|
|
|
|
|
dependencies: [
|
|
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|
|
{ src: 'reveal.js/lib/js/classList.js', condition: function() { return !document.body.classList; } },
|
|
|
|
|
{ src: 'reveal.js/plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
|
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|
{ src: 'reveal.js/plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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{ src: 'reveal.js/plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
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{ src: 'reveal.js/plugin/zoom-js/zoom.js', async: true },
|
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{ src: 'reveal.js/plugin/notes/notes.js', async: true }
|
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|
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]
|
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|
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});
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|
</script>
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</body>
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</html>
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