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BDD, SpecFlow and The SpecFlow Ecosystem

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In this series of five articles, I want to help you get started with using SpecFlow in your test automation project. Here’s what you can expect to learn more about in the next few coming weeks:

  1. In this first article, I will explain what Behaviour Driven Development (BDD) is, what SpecFlow is and how it supports BDD, and what SpecFlow exactly does and does not do.
  2. The next article will get you started with using SpecFlow in your test automation project by explaining how to set up and configure SpecFlow, how to write your first SpecFlow specification and how to make it executable.
  3. After that, we’ll take a close look at creating more intelligent and flexible scenarios with the goal of creating expressive specifications that support communication about application behaviour and acceptance test goals and results.
  4. The fourth article will show you how, when your project is growing, you can keep your specifications clean by applying techniques for improving readability and maintainability.
  5. The fifth and final article will demonstrate how to work effectively with tables in SpecFlow scenarios.

Tutorial Chapters

  1. You’re here → BDD, SpecFlow and The SpecFlow Ecosystem (Chapter 1)
  2. Getting Started with SpecFlow (Chapter 2)
  3. Writing More Expressive SpecFlow Steps (Chapter 3)
  4. Tidying up your features and scenarios (Chapter 4)
  5. Working with SpecFlow tables and SpecFlow.Assist (Chapter 5)

What is Behaviour Driven Development?

Introduced by Dan North in 2006, Behaviour Driven Development (BDD) is an Agile software development practice that encourages collaboration between developers, testers and business representatives, such as business analysts or product owners.

One of the main goals of BDD is to create a shared understanding of how an application should behave by facilitating discussion and coming up with concrete examples, expressed in a Domain Specific Language (DSL) using the Given / When / Then syntax known as Gherkin. The other component of BDD is concerned with turning these specifications into automated acceptance tests, and that is where tools like SpecFlow come into play.

This means that there is a difference between using tools like SpecFlow on the one hand and adopting BDD as a process on the other hand. Having done the former (i.e., SpecFlow is part of your test automation stack) does not equal practicing BDD. Now, I don’t mean to say that there’s no value in using these tools when you have not adopted the other aspects of BDD, but it’s a good idea to make it clear what aspect(s) of BDD we are talking about here.

What is SpecFlow and How Does it Support BDD?

Instead, we should say that SpecFlow supports BDD, and it does so by providing a mechanism to turn your specifications into executable code, which can then be used to create automated tests that can be run against the application to verify whether it actually exerts the behavior as has been described in these specifications.

To put it in BDD and SpecFlow terms, SpecFlow turns specifications that are written down in the Gherkin Given / When / Then syntax as scenarios contained in feature files into executable code methods known as step definitions.

SpecFlow Tutorial

Having transformed these steps, expressed in natural, readable language, into executable code, that’s where the responsibility of SpecFlow ends. To further implement your test automation so that it actually communicates with your application under test, you will need to add other tools to your test automation solution.

Some tools that are often used in combination with SpecFlow to form a test automation framework are:

  • A unit testing framework such as NUnit, MSTest or xUnit.NET. This unit testing framework typically performs three tasks:
    • Act as a test runner that executes the scenarios one by one, or in parallel.
    • Provide an assertion library that can be used to compare expected outcomes that are codified by the creator of the test automation with actual outcomes observed in the application under test.
    • Provide basic test results in reports, mostly in a form that can be picked up by a test orchestration or Continuous Integration tool like Jenkins, GitLab, Bamboo or similar.
  • A library that interacts with browsers and browser applications. The most common example of these tools is the Selenium WebDriver library.
  • A library that interacts with APIs or web services, for example RestSharp.
  • A library that generates human-readable reports, often in HTML format. Two popular examples of this category of tools are Allure and ExtentReports.

SpecFlow Tutorial

Note: the arrow between SpecFlow and the unit testing framework is bidirectional because SpecFlow step definitions contain code that is part of the unit testing framework (including assertions), but the unit testing framework in turn takes care of running the SpecFlow features and scenarios too.

The SpecFlow Ecosystem

In the previous section above, you have seen that it takes more than just using SpecFlow to write and run automated tests against your application. Having established that, let’s take a quick look at the tools available in the SpecFlow ecosystem.

Besides the core SpecFlow project itself, which is available for free and open sourced under the New BSD license at https://github.com/techtalk/SpecFlow, the people behind the SpecFlow project have also created a set of extensions collectively known as SpecFlow+. In this collection, you’ll find:

If you’re working with Visual Studio to create your automated acceptance tests using SpecFlow, you will also likely benefit from installing and using the SpecFlow Extension for your Visual Studio version. This extension enables, among other features, syntax highlighting for better feature and scenario readability, the ability to jump from a step to its corresponding step definition and generating skeleton step definitions directly from steps.

We’ll see more about the SpecFlow Visual Studio integration in the next article, where we will see how to get started with using SpecFlow.

Stay tuned, the following chapters are coming soon!!! 🤓

 

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About the author

Bas Dijkstra

Bas is an independent professional who takes pride in helping teams and organizations improve their testing efforts through smart application of tools.

Bas is also a trainer on various subjects related to testing and automation. He lives in the Netherlands with his wife and two sons and when he is not working he likes to run or to read a good book (particularly British detective novels).

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