BDD Vs. TDD: How you can use both to transform into Agile testing

Test-driven development and behavior-driven development are similar but different approaches to creating your applications. They are often misunderstood. 

For many of you, this will be the first time you hear about bdd vs tdd or see how they compare to each other or why they are essential. This article will make it all clear for you!

But before we delve into the matter at hand, let’s first understand how it all fits within the agile framework.

How to Use Agile to Equip Your Team for Success

Some initiatives begin with temporary contractors developing a new solution with the help of tools like API test automation, manual testing and qa tools to meet a compulsory requirement in many IT firms. When the project is finished, it either terminates or becomes a continuing project with new persons joining and/or leaving. As a result, knowledge management and transfer within the team become difficult. The company rapidly recognizes the need for a dedicated product staff to develop the service based on real-world user feedback continuously.

You don’t even need the answers at the start of an Agile project; instead, you learn as you go, and this feedback helps engineers design functionality that customers actually want and use.

As a result of this context, the team evolves, and a Product Owner (PO) job is often created. The entire team uses the PO to capture external requests and comments from genuine users (referred to as the client). The PO will handle both a short-term backlog of two sprints’ worth of improved work and a long-term strategy for the following six months. This is in addition to the team’s internal demands to pay down tech debt and/or optimize efforts.

If you utilize an engineering first approach, you can see how this fits into Agile development:

The following engineering fundamentals are compatible with TDD/BDD and the team:

  • Define the issue at hand (BDD)
  • To solve the business problem, define the technological problem (BDD/TDD).
  • Create a technical solution to the technical issue (TDD)
  • Validate and test (TDD)
  • Verify that the technological solution solves the problem (Demo/PO approval).
  • Verify that the technical problem is solved by the business problem (demo/stakeholder approval).
  • Otherwise, redesign/refactoring is required.

The team now has a good platform to apply testing methodologies within Agile.

This is why, before beginning any work, Agile teams should establish an internal agreement around Definition of Ready (DoR) and Definition of Done (DoD). This aids in defining and not shifting the goalposts.

A healthy product team meets before the sprint starts to set strong acceptance criteria for each user story and how those user stories translate into a broader feature.

In several iterations, the goal is to add value. More minor modifications, made more frequently, provide better feedback and the potential to learn through trial and error.

TDD vs. BDD: What’s the Difference?

TDD is a subset of BDD. You are effectively practicing the TDD method when you do BDD. Each has its own set of objectives:

TDD (Test Driven Development) – enables progressive development.

BDD – alignment and shared understanding with key stakeholders

In a nutshell, TDD entails first building tests, then writing enough code to pass the test, and finally looping through the Red-Green-Refactor cycle until the developer believes enough functionality exists to meet the acceptance requirements.

BDD refers to the process of establishing a shared understanding/agreement with a more extensive set of stakeholders by describing how the code/application should behave in plain human-readable terms.

TDD is a skill to instill in your developers, but BDD is a skill to instill in your product owners. It’s a collaborative effort from all of us. They both need each other to prosper.