BDD with cucumber

Behaviour-driven
development with
Cucumber
Kerry Buckley
BT DevCon6, 4 February 2013

http://www.ﬂickr.com/photos/yogendra174/4665988849

A developer tool for
end-to-end testing of
ruby web applications

end-to-end testing of
ruby web applications
LIE

Feature: DevCon talk
In order to fill the DevCon6 schedule
As a Cucumber user
I want to talk about BDD with Cucumber

Scenario: "BDD with Cucumber" talk
Given I have managed to prepare a talk
And there are people there to hear it
When I give the talk
Then the audience should learn something

Feature: Withdraw cash from account

Scenario: Successful withdrawal
Given I have £100 in my account
When I request a withdrawal of £20
Then I should receive £20
And my balance should be £80

$ cucumber withdraw_cash.feature
Feature: Withdraw cash from account

Scenario: Successful withdrawal # withdraw_cash.feature:3
Given I have £100 in my account # withdraw_cash.feature:4
When I request a withdrawal of £20 # withdraw_cash.feature:5
Then I should receive £20 # withdraw_cash.feature:6
And my balance should be £80 # withdraw_cash.feature:7

1 scenario (1 undefined)
4 steps (4 undefined)
0m0.002s

You can implement step definitions for undefined steps with these snippets:

Given /^I have £(d+) in my account$/ do |arg1|
pending # express the regexp above with the code you wish you had
end

...

Scenario: Successful login
Given a user "Fred" with password "secret"
When I go to the login page
And I fill in "User name" with "Fred"
And I fill in "Password" with "secret"
And I press "Log in"
Then I should see "Welcome, Fred"

Scenario: Adding a CaaS Linux Service in a production (or test) environment
Given a fred production environment exists
And I am on the last deployment page

When I select "CaaS Linux Service" from "Add a new"
And I press "Add service"
And I fill in the following:
| Role | FTP Server |
| Application Installed Software | None |
And I select "SC3 (redside)" from "Security Domain"
And I select "2" from "Virtual CPUs"
And I select "2" from "Virtual Memory"
And I select "OEL 5u6 32bit" from "Operating System"
And I select "None" from "MaaS(EMB) MQ Client"
And I select "None" from "Oracle Client"
And I check "Netbackup Client"
And I check "XFB Client"
And I check "BT Hunter Client"
And I check "BTBPTM Client"
And I check "Web Tier"
And I press "Save"

Then I should be on the last deployment page
And I should see "Service saved"
And I should see ...

Scenario: User is greeted upon login
Given the user "Fred" has an account
When he logs in
Then he should see "Welcome, Fred"

Given /^the user "(.*?)" has an account$/ do |name|
@user = User.find_or_create_by_name name, password: "secret"
end

When /^he logs in$/ do
visit "/login"
fill_in "User name", with: @user.name
fill_in "Password", with: @user.password
click_button "Log in"
end

Then /^he should see "(.*?)"$/ do |text|
page.should have_content(text)
end

Scenario: User is greeted upon login
Given the user "Fred" has an account
When he logs in
Then he should see "Welcome, Fred"

Scenario: Secure pages require login
When I visit a secure page as a guest
Then I should be asked to log in

When I log in with a valid account
Then I should see the secure page

Feature: My awesome system

Scenario: Using the system
Given the system exists
When I use it
Then everything should work perfectly

end-to-end testing
of web applications

LIE

end-to-end testing
of web applications

Scenario: create a dir
Given a directory named "foo/bar"
When I run `file foo/bar`
Then the stdout should contain "foo/bar: directory"

Scenario: create a file
Given a file named "foo/bar/example.txt" with:
"""
hello world
"""
When I run `cat foo/bar/example.txt`
Then the output should contain exactly "hello world"

A tool for end-to-
end testing of web
applications

A tool for end-to-
end testing of web
LIE
applications

More feature
… er …
features

Feature: Posting messages to friends

Scenario: Posting a text message
Given I am logged in
When I post a text message
Then my friends should see my message

Scenario: Posting a photo
When I post a photo
Then my friends should see a thumbnail of my photo
And clicking the thumbnail should show the photo

Feature: Posting messages to friends
Background:

Scenario: Posting a text message
When I post a text message
Then my friends should see my message

Scenario: Posting a photo
When I post a photo
Then my friends should see a thumbnail of my photo
And clicking the thumbnail should show the photo

Scenario:
When I add 1 widget to my order
And I add 5 doodahs to my order
And I add 2 thingummies to my order
Then my basket total should be £12.34

Scenario: Simple addition
When I calculate 2 + 2
Then the answer should be 4

When I calculate 10 + 5

Scenario: Simple multiplication
When I calculate 2 * 2

When I calculate 6 * 7

Scenario Outline: Simple arithmetic
When I calculate <first> <operation> <second>
Then the answer should be <answer>

Examples:
| first | operation | second | answer |
| 2 | + | 2 | 4 |
| 10 | + | 5 | 15 |
| 2 | * | 2 | 4 |
| 6 | * | 7 | 42 |

http://www.ﬂickr.com/photos/yogendra174/4665988849

# language: fr
Fonctionnalité: Addition
Afin de financer mon bonus avec l'argent des pigeons
En tant que trader
Je souhaite pouvoir additionner 2 chiffres

Plan du Scénario: Addition de produits dérivés
Soit une calculatrice
Etant donné qu'on tape <a>
Et qu'on tape <b>
Lorsqu'on tape additionner
Alors le résultat doit être <somme>

Exemples:
| a | b | somme |
| 2 | 2 | 4 |
| 2 | 3 | 5 |

# language: es
Característica: adición
Para evitar hacer errores tontos
Como un matemático idiota
Quiero saber la suma de los números

Esquema del escenario: Sumar dos números
Dado que he introducido <entrada_1> en la calculadora
Y que he introducido <entrada_2> en la calculadora
Cuando oprimo el <botón>
Entonces el resultado debe ser <resultado> en la pantalla

Ejemplos:
| entrada_1 | entrada_2 | botón | resultado |
| 20 | 30 | add | 50 |
| 2 | 5 | add | 7 |
| 0 | 40 | add | 40 |

# language: de
Funktionalität: Addition
Um dumme Fehler zu vermeiden
möchte ich als Matheidiot
die Summe zweier Zahlen gesagt bekommen

Szenariogrundriss: Zwei Zahlen hinzufügen
Angenommen ich habe <Eingabe_1> in den Taschenrechner eingegeben
Und ich habe <Eingabe_2> in den Taschenrechner eingegeben
Wenn ich <Knopf> drücke
Dann sollte das Ergebniss auf dem Bildschirm <Ausgabe> sein

Beispiele:
| Eingabe_1 | Eingabe_2 | Knopf | Ausgabe |
| 20 | 30 | add | 50 |
| 2 | 5 | add | 7 |
| 0 | 40 | add | 40 |

# language: en-lol
OH HAI: STUFFING

MISHUN: CUCUMBR
I CAN HAZ IN TEH BEGINNIN 3 CUCUMBRZ
WEN I EAT 2 CUCUMBRZ
DEN I HAS 2 CUCUMBERZ IN MAH BELLY
AN IN TEH END 1 CUCUMBRZ KTHXBAI

Getting the most
out of Cucumber

http://www.ﬂickr.com/photos/oskay/2156888497

Given /^the user "(.*?)" has an account$/ do |name|
end

Given /^a logged-in user$/ do
@user = User.find_or_create_by_name "Fred", password: "secret"
visit "/login"
fill_in "User name", :with => @user.name
fill_in "Password", :with => @user.password
end

visit "/login"
fill_in "User name", with: @user.name
fill_in "Password", with: @user.password
end

Then /^he should see "(.*?)"$/ do |text|
page.should have_content(text)
end

module LoginSteps
def login(name, password)
visit "/login"
fill_in "User name", with: name
fill_in "Password", with: password
end
end

World(LoginSteps)

Given /^a logged in user$/ do
login(@user.name, @user.password)
end

login(@user.name, @user.password)
end

http://tooky.co.uk/2013/01/18/cucumber-and-full-stack-testing.html

http://blog.mattwynne.net/2012/05/31/hexagonal-rails-objects-values-and-hexagons/

A tool for
end-to-end testing
of applications

A tool for
end-to-end testing
LIE
of applications

A tool for testing
applications

A tool for testingRELY
TI
applications
N
EN HER
OT EIT
UE
TR

http://www.ﬂickr.com/photos/elycefeliz/3224486233

Made-up statistics

Identifying scenarios
25%
Automated tests
35%

Agreeing steps
40%

$ cucumber talk.feature
Feature: DevCon talk
In order to fill the DevCon6 schedule
As a Cucumber user
I want to talk about BDD with Cucumber

Scenario: "BDD with Cucumber" talk # talk.feature:6
Given I have managed to prepare my talk on time # talk_steps.rb:1
And there are people there to hear it # talk_steps.rb:4
When I give the talk # talk_steps.rb:7
Then the audience should learn something # talk_steps.rb:10

1 scenario (1 passed)
4 steps (4 passed)
0m0.002s

http://www.ﬂickr.com/photos/erix/3780828260

BDD with cucumber

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