Future of .NET BDD: An Introduction to ReqnRoll

As of December 31st, 2024, SpecFlow has reached its end of life, paving the way for ReqnRoll as the go-to tool for Behavior Driven Development (BDD) in .NET. If you're currently using SpecFlow, it's time to consider migrating to ReqnRoll. Also, it is recommended to use ReqnRoll for new BDD projects with .NET.

What is ReqnRoll?
ReqnRoll is an open-source, Cucumber-style BDD test automation framework for .NET, created as a reboot of the SpecFlow project. ReqnRoll is a BDD tool created by the same authors as SpecFlow. Gasper Nagi, the original author of SpecFlow, is also the author of ReqnRoll. It is designed to help bridge the gap between technical implementation and business requirements through human-readable test scenarios. If you have experience with SpecFlow, ReqnRoll will feel very familiar. The primary differences lie in the plugins and some additional features that ReqnRoll offers.

Why BDD?
BDD helps translate requirements into executable test cases. Traditionally, test engineers gather requirements from various sources, including documents, Confluence pages, Azure documentation, Excel sheets, and stakeholder discussions. These requirements are then manually converted into test cases, often stored in Excel sheets or test management tool. However, these test cases can become difficult to manage due to readability issues and their static nature, making programmatic operations challenging. BDD with ReqnRoll bridges this gap by using feature files written in the Gherkin language.

BDD is an evolution of Test Driven Development (TDD), employing a Gherkin-style format. Gherkin uses plain English text with a specific syntax (Given, When, Then) to define scenarios. For example: "Given I navigate to this website, When I enter the username as admin and password as password, Then I see the homepage".

BDD is a widely debated topic. While some argue it adds complexity, others find it valuable for aligning development with business goals. Its usefulness depends on your project's function and needs.

Setting Up ReqnRoll
To get started with ReqnRoll, you'll need the following:

  • Windows 11
  • Visual Studio 2022
  • .NET 8 or above

If you're using macOS, use Rider IDE with the ReqnRoll plugin.

  1. Install the ReqnRoll extension in Visual Studio. This extension provides project templates and enables the creation of new ReqnRoll projects.
  2. After installation, a new "ReqnRoll Project" option will appear when creating a new project.
  3. The project creation wizard allows you to choose a test framework: NUnit, MSTest, or XUnit.
  4. The project template sets up a folder structure and adds the necessary dependencies, such as ReqnRoll.NUnit, NUnit, NUnit3TestAdapter, and Microsoft.NET.Test.SDK.
  5. A sample calculator.feature file is created to demonstrate the Gherkin format.

Understanding Feature Files and Gherkin Syntax

Feature files are written in Gherkin, which uses specific keywords to define test scenarios.

  • Feature: Represents a high-level functionality or module.
  • Tags: (using the @ symbol) Categorize tests (e.g., @smoke, @regression).
  • Scenario: Defines a specific test case.
  • Given: Specifies the initial context or preconditions.
  • When: Describes an event or action.
  • Then: States the expected outcome or result.

The plain English text in the feature file is mapped to C# code (step definitions). Building the solution generates an auto-generated file from ReqnRoll. You can navigate from the feature file steps to their corresponding step definitions in the C# code.

Key Resources for ReqnRoll
Below are key resources for a deep dive into ReqnRoll.

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