What is Cucumber Framework?

  

Cucumber is one of the most popular tools used for Behavior Driven Development (BDD). It allows developers, testers, and business analysts to write test cases in a natural, human-readable language that bridges the gap between technical and non-technical stakeholders.

What is Cucumber ?

Cucumber is an open-source BDD testing tool written in Ruby, but it supports many languages like Java, JavaScript, Python, and others. It enables you to write executable specifications for software behavior using a plain text language called Gherkin.

These Gherkin scenarios are then mapped to step definitions, which are actual automation code written in a programming language like Java or Python.

Why Use Cucumber?

• Encourages collaboration between developers, testers, and business users.

• Helps in defining clear acceptance criteria.

• Makes test cases more understandable to non-technical stakeholders.

• Acts as documentation of the system’s behavior.

• Supports automation and manual readability together.

Example of Cucumber in BDD

Gherkin Feature File - login.feature

Feature: Login Functionality

  Scenario: Successful login with valid credentials
    Given the user is on the login page
    When the user enters a valid username and password
    And clicks on the login button
    Then the user should be redirected to the homepage

Step Definition file - Java class

@Given("the user is on the login page")
public void user_on_login_page() {
    // Code to open login page
}

@When("the user enters a valid username and password")
public void enter_credentials() {
    // Code to enter username and password
}

@When("clicks on the login button")
public void click_login_button() {
    // Code to click login button
}

@Then("the user should be redirected to the homepage")
public void redirect_to_homepage() {
    // Code to verify homepage
}

Features of Cucumber

Feature	Description
Gherkin Language	Uses plain English-like syntax (Given-When-Then) to write scenarios.
Supports Multiple Languages	Works with Java, Ruby, Python, JavaScript, etc.
Readable by Non-Technical Users	Designed to be easily understood by business stakeholders.
Integration with Selenium and Other Tools	Works well with automation tools like Selenium, Appium.
Reusability	Step definitions can be reused across multiple scenarios.
Tags	Helps in grouping and selectively running scenarios.
Hooks	Allows setting up @Before and @After actions for scenarios.
Reports	Supports various report formats like HTML, JSON, etc.
Parallel Execution	Allows running scenarios or features in parallel for faster testing.
Live Documentation	Feature files serve as live documentation of the system.

Advantages of Cucumber

• Readable and easy to write test scenarios.

• Encourages collaboration among teams.

• Facilitates automated acceptance testing.

• Promotes test-first approach in Agile and BDD.

Disadvantages of Cucumber

• May add overhead for small projects.

• Requires learning curve for writing Gherkin properly.

• May lead to duplicate steps if not managed well.

• Execution is slower compared to unit test frameworks.