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520 lines
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520 lines
14 KiB
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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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<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/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="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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<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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<section> |
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<h2>Robot Framework</h2> |
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<pre><code>*** 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</code></pre> |
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<p> |
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<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> |
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<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 ${password} |
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I try to create a user |
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Create user |
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I should get an error of invalid password |
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Is invalid password</code></pre> |
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</section> |
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<section> |
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<h2>Robot Framework</h2> |
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<pre><code>$ 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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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> |
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<h2>Behave</h2> |
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<p>Vantagens:</p> |
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<ul> |
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<li>Mais simples</li> |
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</ul> |
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</section> |
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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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