Cucumber-III

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Behavior Driven Development
CUCUMBER
Chaitanya Kumar Reddy(338057) – 29/09/2015

 Introduction
 Behavior Driven Development
 Use vs. Don’t Use
 Cucumber Feature File
 Step Definition
 References
Agenda

Introduction
 Cucumber is a tool based on BDD (Behavior Driven Development) framework.
 Cucumber is used to write acceptance tests for a web application.
 It allows the developer to develop the test cases in a very easy way, that
everyone can understand.
 Cucumber was implemented in Ruby and later extended to Java.
 Cucumber can be used along with Selenium.
 Cucumber Supports many other languages like Perl, PHP, Python, .Net etc.

Behavior Driven Development (BDD)
 Behavior-driven development is an agile software development technique
that encourages collaboration between developers, QA and non-technical
participants in a software project.
 Behavior Driven Development is emerged from Test Driven Development.
TDD BDD

Use vs. Don’t Use
Cucumber is useful:
 Separation of examples and automation
 Possess structure but not too much
 Pressure to grow a ubiquitous language
 Just enough syntax
Cucumber is not useful:
 Small set of tests
 Too much overhead
 Only developers will look at the tests
 Working with Regular expressions

Cucumber Feature File
 Every cucumber project consists of a directory named features.
 This directory contains feature files with extension “.feature”
 Feature file contains following components:
 Feature
 Scenario/Scenario Outline
• Given
• When
• Then
• And
• But

Cucumber Feature File ..cont.
 Feature: This will describe about the current feature file.
 Scenario: Describes the steps and expected output for the test case.
- Below is the example for scenario:

 Scenario Outline: A scenario that is executed for multiple sets of data. Below
is the example for defining Scenario Outline.

 Given: Specifies the context of the test to be executed and puts the system in
known state.
 When: Specifies the key action to be performed.
 Then: Observes the output.
 And/But: If there are several ‘Given’s, ‘When’s and ‘Then’s. We can use
And/But to replace some of them.

Step Definition
 Every step in the feature file will be having a step definition.
 Step Definition will have the code to perform the actions.
 Step Definition will have the string that matches the string in feature file.
-- feature 

 Below are the step definitions for the above feature.
Step Definition ..cont.

Step Definition ..cont.
 In step definitions we will write selenium code to automate the test cases.

References
 https://github.com/cucumber/

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Thank you
Chaitanyakumarreddy.thathagari@techmahindra.com

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