Implementing BDD for Complex Scenarios: A Practical Guide

Implementing BDD for Complex Scenarios: A Practical Guide

3 July 2024 Stephan Petzl Leave a comment QA

Behavior Driven Development (BDD) has become an essential practice in modern software testing, particularly for its ability to make test cases more readable and maintainable. A common question that arises is whether BDD, with its “Given, When, Then” structure, is suitable for complex, end-to-end scenarios, or if it should be reserved for simpler, unit-test-like cases.

Understanding BDD Syntax

BDD uses a straightforward syntax that includes:

  • Given: Describes the initial context or state of the system.
  • When: Specifies the action or event that triggers the behavior.
  • Then: Describes the expected outcome or result of the action.

This format helps in creating clear and understandable test cases that can be easily communicated across team members, including non-technical stakeholders.

Scaling BDD for Complex Scenarios

One common concern is whether BDD can handle complex scenarios effectively. The answer is yes, but with some considerations:

  • **Break Down Complexity**: If a test case appears too complex, consider breaking it into smaller, more manageable tests. This not only simplifies the individual tests but also provides more focused feedback.
  • **Chaining Inputs**: Complex scenarios often involve chaining multiple inputs and actions. Ensure that each step is clear and concise to avoid confusion.
  • **Use of Implicit Checks**: In some cases, implicit checks can be used to simplify the test. For example, a step like “Then the registration should be successful” can encompass multiple validations such as form submission, email confirmation, and successful login.

By managing the complexity and ensuring clarity in each step, BDD can be effectively used for both simple and intricate scenarios.

Practical Examples

Here are some examples to illustrate the application of BDD in different scenarios:

Simple Scenario

Scenario: Error when the password and confirm password do not match
Given I am on User Registration Form
When I fill the Form fields as follows:
| Field            | Value          |
| Name             | myusername     |
| Password         | password123    |
| Confirm Password | passnotmatch234|
And I click on the button “Save”
Then the error message should be “Password and Confirm password do not match”


Complex End-to-End Scenario

Scenario: New user with unique name can be registered in the system
Given user with name “Uncle Bob” does not exist in the system
When I create a new user with name “Uncle Bob”
Then the registration should be successful


In the complex scenario, the step “Then the registration should be successful” includes several implicit checks:

  • Registration form was saved without errors
  • User received a confirmation email
  • User clicked on the confirmation link and the email confirmation was successful
  • User logged in to the system

Enhancing BDD with Automation Tools

Automating BDD scenarios can significantly improve efficiency and accuracy in testing. No-code test automation tools like Repeato can be particularly beneficial. Repeato allows you to create, run, and maintain automated tests for iOS and Android apps with ease, leveraging computer vision and AI for robust testing.

With Repeato, you can quickly edit and run tests, making it an excellent choice for implementing BDD in complex scenarios. Its simplicity in setup and use ensures that both technical and non-technical team members can contribute to the testing process effectively.

For more information on effective testing strategies and tools, visit our blog.

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