Home Guide Introduction to Cucumber Testing Tool

Introduction to Cucumber Testing Tool

By Jash Unadkat, Technical Content Writer at BrowserStack -

Cucumber is an open-source software testing tool written in Ruby. Cucumber enables you to write test cases that anyone can easily understand regardless of their technical knowledge.

Before understanding cucumber testing, let’s quickly go through the various types of automation testing frameworks

  1. Linear Scripting Framework
  2. Modular Testing Framework
  3. Data-driven Framework
  4. Keyword-driven Testing Framework
  5. Behavior-driven Development Testing Framework

Cucumber supports Behavior-driven Development

Behaviour-driven Development is a software development technique that has evolved from TDD (Test Driven Development), which is an approach or programming practice where the developers write new code only when the automated test case fails.

Behavior-driven development’s approach involves the usage of shared language that enhances communication between various tech and non-tech teams. Tests are more user-focused and based on the system’s behavior. In BDD, “Given-When-Then” is the proposed approach for writing test cases.

Consider the below example for better understanding:

  • Given the user has entered invalid credentials
  • When the user clicks submit button
  • Then display the proper validation message

Benefits of Behavior-driven development

  • Focuses on defining ‘behavior’ rather than defining ‘tests’
  • Enhances communication among the members of a cross-functional product team
  • Helps reach a wider audience by the usage of non-technical language
  • Enables you to understand how the system should perform from the developer’s and customer’s perspective
  • The improvement in the quality of code results in reduced costs of maintenance and also minimizes the project’s associated risks

Below image describes a simple BDD operation –


Source: Tutorialspoint

Limitations of Behavior-driven development

  • Testers must have prior experience in TDD (Test-driven Development) to work in BDD
  • BDD approach may be ineffective if the requirements are not correctly analyzed
  • Testers must have sufficient technical skills

Role of Cucumber Framework

Cucumber is used to execute automated acceptance tests written in the “Gherkin” language. Gherkin is a domain-specific language for behavior descriptions. Gherkin is business readable.

Cucumber test automation makes use of two important files –

  1. Feature file – Contains code written in Gherkin (plain English text)
  2. Step definition file – Contains the actual code written by the developer

Below images represent sample Feature and Step definition files:

Feature file:

Cucumber Testing Tool

Image Source: Tutorialspoint

Step Definition File:

Cucumber acts as a bridge between the following teams:

  • Business Analysts and Software Engineers
  • Manual and Automation Testers
  • Manual Testers and Developers

Cucumber with Selenium

Many organizations prefer the Selenium framework for cross browser compatibility testing. These organizations also prefer integrating Cucumber with Selenium as it makes it easier to read and understand the flow of applications among the members from different teams. Gherkin syntax involves simple and plain text, which makes it easier to understand test cases.

Cloud testing products like BrowserStack support Selenium testing with Cucumber.

Run Selenium Test on Real Device for Free

Benefits of using Cucumber Testing Tools

Involving stakeholders becomes easier regardless of their programming knowledge

  • Testers can write Test scripts without having in-depth knowledge of programming
  • Plugins are faster as compared to Selenium
  • Supports various programming languages
  • Code can be reused
  • Simple and quick setup
  • Flexible with different software platforms like Selenium, Ruby on Rails, Watir, Spring framework, and so forth


  • Cucumber is a purely business-driven development tool written in Ruby
  • The business-driven development approach is an advancement over test-driven development approach, which follows the
  • ‘Given-When-Then’ steps for writing test cases
  • Cucumber makes use of Gherkin ( A simple plain text language parser) to describe expected software behaviors in a logical language, that results in better communication and collaboration among technical and non-technical team members
  • Cucumber provides compatibility with popular software platforms like Selenium, Watir, Ruby, and other popular platforms
  • One must also keep in mind the limitations, before deciding the behavior-driven development approach

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