Test and Behaviour Driven Development with Python€¦ · Test BDD TDD Behaviour-Driven Development...

Test and Behavior Driven

Development with Python

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Lorena Lobato Pardavila, IT-CM-LCS

2nd Developers@CERN Forum

CERN, 31st May 2016

27/05/16

2nd Developers@CERN Forum 2

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What I am going to talk?

• What do you know about testing?

• What is Test-Driven Development?

• Is Behaviour-Driven Development the same?

• Unit Testing tools: Behave and Selenium Web Driver

• What do we take from this talk?

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What do you know about Testing?

White-Box Testing Focus on the activities. You know the

source of the program

Black-Box Testing Focus in the result. You have no idea how

the program should work

Unittest Single piece of code to be tested

Integration testing Multiple pieces are tested together

Acceptance Testing Automatic testing of the entire application

TDD vs BDD Agile Software Development techniques

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What is Test-Driven Development?

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Test-Driven Development (TDD)

Add test

Refactor Run tests

Does the

test fail?

Write the

code

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Is Behaviour-Driven Development

the same?

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Write a

Failing

Unit Test

Make the

Test Pass

Refactor

Write a Failing

Acceptance

Test

BDD TDD

Behaviour-Driven Development (BDD)

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Behaviour-Driven Development (BDD)

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UNIT TESTING TOOLS

BDD framework based on Python implementation

of the Cucumber specification

Behave uses tests written in a natural language

style, backed up by Python code.

BDD concepts: When, Given, Then

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Behave

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Behave: Environment Controls

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Behave: Write the feature test

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Behave: Provide the Test Automation

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Behave: Run your test

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Behave example: DNS LB

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Behave example: DNS LB

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What if…?

• Open source, web-based testing automation tool

• It aims to mimic the behaviour of a real user, and as such

interacts with the HTML of the application.

• Muti-language backend support (Java, Ruby, Python, C#, PHP…)

• Supports Cross-Browser Testing. The tests can be run on multiple

browsers.

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Selenium Web Driver

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Selenium Web Driver

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Selenium Web Driver Example: DNS LBfrom selenium import webdriver

from selenium.webdriver.common.keys import Keys

from selenium.webdriver.common.alert import Alert

import unittest

class NewvisitorTest(unittest.TestCase):

def setUp(self):

self.browser = webdriver.Firefox()

self.browser.implicitly_wait(3)

def tearDown(self):

self.browser.quit()

pass

def test_sso_login(self):

self.browser.get("https://aiermis.cern.ch/lbweb")

self.assertIn('DNS Load Balancing', self.browser.title)

link = self.browser.find_element_by_link_text('CERN SSO Login') .click()

self.assertIn('Cern Authentication', self.browser.title)

link = self.browser.find_element_by_link_text('Sign in using your current Windows/Kerberos credentials').click()

page_text = self.browser.find_element_by_tag_name('body').text

self.assertIn('Logged in', page_text)

inputbox = self.browser.find_element_by_id('id_new_alias')

inputbox.send_keys(‘hola-developers!')

inputbox.send_keys(Keys.ENTER)

…........

if __name__ == '__main__':

unittest.main()

• Unit Testing gives you the what. Test-Driven

Development gives you the when. Behavior Driven-

Development gives you the how.

• Run tests often by integrating these tools with CI

systems.

• Behave is great to have the code documented and to

know in advance the requirements

• Selenium Web Driver for “lazy people”

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From this talk..

I like it! Where can I start from?

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Unit testing Python framework https://docs.python.org/2.7/library/unittest.html

General rules Python testing http://docs.python-guide.org/en/latest/writing/tests/

Behave http://pythonhosted.org/behave/

Selenium Web Driver http://selenium-python.readthedocs.io/

Test-Driven Development with

Python

http://chimera.labs.oreilly.com/books/1234000000754/

Questions?

THANKS FOR YOUR ATTENTION!

27/05/16 tCSC 2016: "Efficient and

Parallel Processing of

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CONTACT

Work: [email protected]

Twitter: @lobatopardavila

mailto:[email protected]

Test and Behaviour Driven Development with Python€¦ · Test BDD TDD Behaviour-Driven Development...

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