Behavior Driven Development (BDD)
Tags: bdd, behaviou, tdd, agile
Published: 2022-12-09 21:23:44

Behavior Driven Development (BDD) is a software development methodology that focuses on defining the behavior of an application through examples. BDD is an extension of the Test Driven Development (TDD) approach, which emphasizes writing tests for the application's behavior before writing the code. BDD takes this a step further by defining the behavior of the application using natural language constructs, such as English, in order to make the tests easier to understand and maintain.

In BDD, the behavior of the application is defined using scenarios, which are written in a language called Gherkin. Gherkin is a human-readable language that describes the behavior of the application in a structured and consistent manner. These scenarios are then used to generate automated acceptance tests, which verify that the application behaves as expected.

BDD is often used in agile software development environments, where it helps teams to focus on delivering value to the customer and improving the quality of the software. It can also help teams to develop a shared understanding of the application's behavior and requirements, and to improve collaboration and communication among developers, testers, and other stakeholders.

## Why should we use Behavior Driven Development ?

There are several reasons why teams may choose to use Behavior Driven Development (BDD) in their software development process:

1. BDD helps teams to focus on the behavior of the application, rather than the implementation details. This can lead to a better understanding of the requirements and the intended behavior of the application, which can improve the quality of the software.

2. BDD encourages collaboration and communication among team members, as the scenarios are written in a human-readable language that can be understood by everyone involved in the project. This can help to reduce misunderstandings and improve alignment among team members.

3. BDD can help teams to write automated acceptance tests that are more maintainable and easier to understand. This can reduce the effort and cost of maintaining the tests over time, and can make it easier to add new tests as the requirements of the application evolve.

4. BDD can provide early feedback on the behavior of the application, which can help teams to identify and fix issues early in the development process. This can save time and effort, and can improve the overall quality of the software.

Overall, BDD can provide many benefits for teams that are looking to improve the quality of their software and deliver value to their customers.

## When shouldn't we use Behavior Driven Development ?

While Behavior Driven Development (BDD) can provide many benefits for teams, there are also some potential drawbacks to using this approach. Some reasons why teams may choose not to use BDD include:

1. BDD requires a significant investment of time and effort to set up and maintain. Teams will need to invest in training, tools, and infrastructure in order to use BDD effectively. This can be a significant cost, especially for small teams or projects.

2. BDD can be more complex and time-consuming than other approaches, such as Test Driven Development (TDD). Teams may find that BDD adds overhead and complexity to their development process, which can be difficult to manage.

3. BDD may not be suitable for all types of projects or teams. Some teams may find that BDD is not a good fit for their development process, or that it does not provide enough value to justify the investment of time and effort.

Ultimately, the decision to use BDD should be based on the specific needs and goals of the team and the project. Teams should carefully consider the potential benefits and drawbacks of BDD, and decide whether it is the right approach for their needs.

## Can we use Behavior Driven Development in any language ? 

Yes, Behavior Driven Development (BDD) can be used with JavaScript, as well as many other programming languages. BDD is a methodology for defining and testing the behavior of an application, and it is language-agnostic. This means that it can be used with any programming language, including JavaScript.

To use BDD with JavaScript, teams will need to use a BDD-specific test runner, such as Mocha or Jasmine. These test runners provide support for running BDD-style tests, and they can be used to define scenarios in Gherkin and generate automated acceptance tests. These tests can then be executed as part of the development process to verify the behavior of the application.

Overall, BDD can be a useful approach for teams that are developing JavaScript applications and want to improve the quality and maintainability of their software. It can help teams to define the behavior of the application in a clear and consistent manner, and to generate automated acceptance tests that can verify that the application behaves as expected.