Download - Cucumber Tutorial
Introduction to CucumberBefore we learn about Cucumber , lets understand BDD -
What is Behaviors Driven Development?
Consider you are assigned to create Funds Transfer module in a Net Banking application.
There are multiple ways to test it
1. Fund Transfer should take place if there is enough balance in source account2. Fund Transfer should take place if the destination a/c details are correct3. Fund Transfer should take place if transaction password / rsa code / security
authentication for the transaction entered by user us correct4. Fund Transfer should take place even if it's a Bank Holiday5. Fund Transfer should take place on a future date as set by the account holder
The test scenario become more elaborate and complex as we consider additional features like transfer amount X for an interval Y days/months , stop schedule transfer when the total amount reaches Z , and so on
The general tendency of developers is to develop features and write test code later. As, evident in above case, test case development for this case is complex and developer will put off testing till release , at which point he will do quick but ineffective testing.
To overcome this issue (Behavior Driven Development) BDD was conceived. It makes the entire testing process easy for a developer
In BDD, whatever you write must go into Given-When-Then steps. Lets consider the same example above in BDD
Given that a fund transfer module in net banking application has been developed And I am accessing it with proper authentication
When I shall transfer with enough balance in my source accountOr I shall transfer on a Bank HolidayOr I shall transfer on a future dateAnd destination a/c details are correctAnd transaction password/rsa code / security authentication for the transaction is correctAnd press or click send button
Then amount must be transferredAnd the event will be logged in log file
Isn't it easy to write and read and understand? It covers all possible test cases for the fund transfer module and can be easily modified to accommodate more. Also, it more like writing documentation for the fund transfer module.
What is Cucumber?
Cucumber tools also support Behavior Driven Development (BDD).It offers a way to write tests that anybody can understand, regardless of their technical knowledge.
In BDD, users (business analysts, product owners) first write scenarios or acceptance tests that describes the behavior of the system from the customer's perspective, for review and sign-off by the product owners before developers write their codes.
Cucumber use Ruby programming language.
What are the benefits?
1. It is helpful to involve business stakeholders who can't easily read code2. Cucumber focuses on end-user experience3. Style of writing tests allow for easier reuse of code in the tests4. Quick and easy set up and execution5. Efficient tool for testing
Advantages of Cucumber over other tools?
Cucumber HP ALM (QTP) Selenium
It is free QTP is expensive It is free
It's a behavior driven development tool
It's a Functional Automation Tool
It's a Functional and Performance ( Selenium Grid) test tool
Plugin in cucumber works faster Plugin are slower compare to Cucumber and Selenium
Plugins are slower than cucumber
Cucumber supports other language as well beyond Ruby like Java, Scala, Groovy etc.
QTP supports only VB script
Selenium supports Java, .Net and many other languages
Writing automation steps are joint effort of testers and developer
In QTP only tester writes automation steps
Like Cucumber, writing automation steps are joint effort of testers and developer
Cucumber supports only web environment
Support web, desktop and any client server application
Supports only web environment
Cucumber InstallationCucumber installation could be tiresome but its relatively easy.
Here is a roadmap of components that need to be installed to make Cucumber work
PART A) Install Ruby:Step 1) Got to http://rubyinstaller.org/downloads/
Select a package as per your OS Version
If you have 32bit version OS than click on Ruby2.0.0-p451 or have a 64bit OS then click on Ruby2.0.0-p451(x64)
Once download is complete, start the installation. Select Your Preferred language For Installation
Step 2) Accept license and click on next
Step 3) Select your Installation Directory & Select all Options
Step 4) Wait for installation to complete.
Step 5) Once installation is complete After install ruby Lets Run Ruby!
Step 6) You will see Ruby Command prompt same as windows cmd.
Part B Install Ruby Development KitStep 1) Download Development kit here . Development kit should be same version as that of Ruby you downloaded.
Step 2) The development kit is in .7zip format file and when you execute it ask for extract file. Just choose any directory you want extract and extract it
Step 3) Now in extracted folder you see dk.rb file. it is development kit installation file, we need it when we install development kit in ruby.
Step 4) Go back to Ruby cmd prompt. And locate development kit directory in cmd which you extracted for development kit.
Step 5) Now type command "ruby (your development kit path) dk.rb init" to initialize process of development kit as shown in image.
Step 6) Next, we have to install development kit. Type command in cmd "ruby (your development kit path)dk.rb install" for installation.
Step 7) Devkit installation completed:
PART C) Install CucumberStep 1) Type in Ruby cmd "gem install cucumber". This command will download and install Cucumber at command line itself
After few seconds cucumber installation procedure has been start
Step 2) To verify cucumber is installed successfully or not just type "cucumber –version"
PART D) Install IDETo write Cucumber Test Scripts, you need IDE
There are two popular GUI based script editor for Windows which can be used for Cucumber - .
1. Ruby mine: You can download from http://www.jetbrains.com/ruby/download/
2. Komodo edit 1.8 You can download from http://www.activestate.com/komodo-ide/downloads
I suggest as a beginner, use komodo edit as it is easy to use.
Step 1) Open Downloaded Setup file and Click On next
Step 2) Accept license agreement
Step 3) Select directory for installation and click on next
Step 4) Click on next to install
Step 5) Installation process starts
Step 6) Komodo install successfully
PART E) Installation For AnsiCon:In command prompt
A "Pass" Cucumber test case is shown in Green A "Fail" Cucumber test case is shown in RedTo show colorized text in cmd prompt you have to install Ansicon tool. You can download
Installation Steps
Step 1) Download Ansicon here
Step 2) Select a folder as per your windows OS versions
Step - 3) Execute file ansicon
AnsiCon installed successfully
PART F) Installation Watir
Watir is used for Web Automation in CucumberTo install Watir , in ruby cmd type "gem install watir"
PART G) rspec Installation
It is used to run additional libraries of cucumber for test run.To install rspec, in ruby cmd type "gem install rspec"
PART H) colorize Installation
It helps to colorize error syntaxTo install rspec, in ruby cmd type "gem install colorize"
Finally you are done and all set J
Cucumber BasicsFor every cucumber project there is a single directory at the root of the project named "features". This is where all of your cucumber features will reside. In this directory you will find additional directories, which is step_definition and support directories
What is "Feature File"?Feature File consist of following components -
Feature: A feature would describe the current test script which has to be executed.
Scenario: Scenario describes the steps and expected outcome for a particular test case.
Scenario Outline: Same scenario can be executed for multiple sets of data using scenario outline. The data is provided by a tabular structure separated by (I I).
Given: It specifies the context of the text to be executed. By using datatables "Given", step can also be parameterized.
When: "When" specifies the test action that has to performed Then: The expected outcome of the test can be represented by "Then"Example:
Feature: Visit career guide page in career.guru99.com
Scenario : Visit career.guru99.com
Given: I am on career.guru99.com
When: I click on career guide menu
Then: I should see career guide page
What is "Step Definition"Step definition maps the test case steps in the feature files (introduced by Given/When/Then) to code, which executes and checks the outcomes from the system under test. For a step definition to be executed, it must match the given compoent in a feature. Step definition is defined in ruby files under "features/step_definitions/*_steps.rb".
Example for Step Definition: Here we will above example of browsing career.guru99.com do We will use features like "When, Then, Given "
Step 1:
Given (/^ I am on career.guru99.com$/) do
Browser.goto "http://career.guru99.com" -This will visit career.guru99 on browser
end
Step 2:
When (/^ click on career guide menu$/) do
Browser.text (:name, " career guide" ).click – This will click "career guide menu"
end
Step 3:
Then (/^ I should see career guide page$/) do
Browser.goto "http://career.guru99.com/category/career-guide/" - It will visit "career guide page"
end
Summary:
You need 2 Files – Features and Step Definition to execute a Cucmber test scenario
Features file contain high level description of the test scenario in simple language
Steps Definition file contains the actual code to execute the test scenario in the Features file.
Your First Cucumber ScriptTest Scenario: Verify output when Email id is not entered
Test Steps:
1. Open Browser2. Go To http://demo.guru99.com/3. Do not enter Email id4. Click Submit
Expected Result: Error is shown
Step 1) Open komodo Editor via windows start menu
You will See Komodo Dashboard as below
Step 2) Now we have to create a
1. new feature file in feature folder2. step definition file in step _definitions folder3. config file in support folder
Create a New file From the File > New > New File
Step 3) Save File in "yourfolder/features/" with name "yourfilename.feature"
Step 4) To execute our scenario, save the following commands in the Feature File
Step 5) Now lets Run our First feature file.!
Click on "Start Command Prompt With ruby"
Step 6) Type "cucumber yourfolder/your feature file path and press enter
It will look like this!
You see the error because you have to write step definitions file for feature file
Step 7) Lets create step definition file for our Feature File!
Create a new file in komodo editor
Step 8) Save File As below in "yourfolder/features/step_definititons" with name test_step.rb
Step 9) Write the following code into the step file
Above code will call the gems we have installed.
Next add Step Definitions For Scenario as below:
Step 10) Now, again run our feature file:
The result is
Step 11) Lets code the next scenario
Test Scenario: Verify output when Email id is not entered
Test Steps:
1. Open Browser2. Go To http://demo.guru99.com/3. Do enter Email id4. Click Submit
Expected Result: Error is shown
let's write feature and scenarios as below for this testing
And write step definitions as below for this scenario:
Run feature file from ruby cmd
Sample code of feature file:
Feature: guru99 Demopage Login
In order to Login in Demopage we have to enter login details
Scenario: Register On Guru99 Demopage without email
Given I am on the Guru99 homepage
When enter blank details for Register
Then error email shown
Scenario: Register On Guru99 Demopage with valid email
Given I am on the Guru99 homepage
When enter details for Register
Then login details shown
Sample of of step definition file for this feature file:
?12
require 'watir-webdriver'
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require 'colorize'
browser = Watir::Browser.new
Given (/^I am on the Guru99 homepage$/)do
browser.goto "http://demo.guru99.com"
end
When (/^enter blank details for Register$/)do
browser.text_field(:name,"emailid").set(" ")
browser.button(:name,"btnLogin").click
end
Then (/^error email shown$/)do
puts " Email is Required".red
browser.close
end
When (/^enter details for Register$/)do
browser = Watir::Browser.new
browser.goto "http://demo.guru99.com"
browser.text_field(:name,"emailid").set("[email protected]")
browser.button(:name,"btnLogin").click
end
Then (/^login details shown$/)do
puts " Sucessfully register"
browser.close
end