Abstract

Test Driven Development (TDD) is a critical agile software development practice that supports innovation in short development cycles. However, TDD is one of the most challenging agile practices to adopt because it requires changes to work practices and skill sets. It is therefore important to gain an understanding of TDD through the experiences of those who have successfully adopted this practice. We collaborated with an agile team to provide this experience report on their adoption of TDD, using observations and interviews within the product development environment. This article highlights a number of practices that underlie successful development with TDD. To provide a theoretical perspective that can help to explain how TDD supports a positive philosophy of software development, we have revised Northover et al.’s conceptual framework, which is based on a four stage model of agile development, to reinterpret Popper’s theory of conjecture and falsification in the context of agile testing strategies. As a result of our findings, we propose an analytical model for TDD in agile software development which provides a theoretical basis for further investigations into the role of TDD and related practices.

Highlights

  • The Emergence of Agile Testing PracticesAgile methods emerged following a chronic software crisis that threatened the computer industry in the 1990s [1]

  • In many agile development teams, the testing component is based on the philosophy and techniques of Test Driven Development (TDD), which is an evolutionary approach to development, involving implementing a test before implementing and refactoring the code [9,10]

  • This experience report has been developed through close collaboration with the engineering manager of an agile team, through observations of TDD practice as it was carried out in his team’s agile production lab and by conducting interviews with the engineers of his team to gather an in-depth understanding of their TDD practice

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Summary

Introduction–The Emergence of Agile Testing Practices

Agile methods emerged following a chronic software crisis that threatened the computer industry in the 1990s [1]. An agile approach incorporates shared ideals of various stakeholders, and a philosophy of regularly providing customers with product features in short time-frames [6] This frequent and regular feature delivery is achieved through a team based approach [7] and by having automated development, testing and release processes [8]. In many agile development teams, the testing component is based on the philosophy and techniques of TDD, which is an evolutionary approach to development, involving implementing a test before implementing and refactoring the code [9,10] These tests should be small, address a small atomic piece of functionality and be executable by a test tool. It was not until the late 1990s that TDD gained wide acceptance as a common practice within agile methods, eXtreme Programming (XP) [12]

Benefits of TDD
Success Factors
Integration and Build Systems
Test Driven Development as Conjecture and Confirmation
Introduction to the Study
A Four Stage Model of Agile Development
A Test Driven Model of Agile Development
Post Hoc Testing and Test Driven Development by Analogy
The Experience Report
Stories as Acceptance Tests
Emergent Design in Tests
Conjecture and Confirmation in Supporting Techniques
Testing Layered Architectures
Test Automation and Roles
A Model of Test Driven Development
Summary and Future Work
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