Design for testability in object-oriented systems
Communications of the ACM
IEEE Software
A Metrics Suite for Object Oriented Design
IEEE Transactions on Software Engineering
An initial investigation of test driven development in industry
Proceedings of the 2003 ACM symposium on Applied computing
A Prototype Empirical Evaluation of Test Driven Development
METRICS '04 Proceedings of the Software Metrics, 10th International Symposium
On the Effectiveness of the Test-First Approach to Programming
IEEE Transactions on Software Engineering
Balancing Agility and Formalism in Software Engineering
Information and Software Technology
The impact of test-driven development on software development productivity: an empirical study
EuroSPI'07 Proceedings of the 14th European conference on Software Process Improvement
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Usage of test-driven development (TDD) is said to lead to better testable programs. However, no study answers either the question how this better testability can be measured nor whether the feature of better testability exists. To answer both questions we present the concept of the controllability of assignments. We studied this metric on various TDD and conventional projects. Assignment controllability seems to support the rules of thumb for testable code, e.g. small classes with low coupling are better testable than large classes with high coupling. And as opposed to the Chidamber and Kemerer metric suite for object-oriented design, controllability of assignments seems to be an indicator whether a project was developed with TDD or not.