January 30, 2010
January 18, 2010
I read a great blog article the other day by Matthew Podwysocki “.Net Code Contracts and TDD Are Complementary”. I also wrote an article on the subject a few weeks ago http://codecontracts.info/2010/01/02/test-driven-development-versus-design-by-contract/. Those articles describe different roles these techniques play in the development process and how they both contribute to better software quality. I won’t repeat the logical arguments made there. But I had an idea for a metaphor to help make these ideas memorable, communicating the synergy achieved by combining both of these techniques.
Computer software is like a person looking for a job. The job applicant has a resume which describes the goals, experience, and skills of the applicant. Here is an example of a resume (more…)
January 17, 2010
The benefits of automated testing are well understood, and widely accepted as a good practice in software development in 2010. Unfortunately, in cases where we need automated testing the most, it is difficult to introduce. The best example is a large code base that is poorly constructed but important to our organization. Michael Feathers has written an excellent book Working Effectively with Legacy Code which describes the problem and how to tackle it in the real world. His book is a tremendous resource for people who wish to introduce automated testing to rotten code that lacks it.
In addition to the excellent ideas in that book, I believe code contracts can also help you achieve higher quality and greater testability. In this article I will explain how this is possible. (more…)
January 16, 2010
This was an advance announcement. The actual presentation can be found at Presentation to Minnesota Visual Studio Users Group – February 17 2010. Topic: Microsoft Code Contracts
I will be speaking about Contract Programming with Code Contracts at the February 17, 2010 meeting of the Minnesota Visual Studio User Group (http://www.vstsmn.net/). The presentation is available at this download link.
January 14, 2010
Our enterprise architect, John Lomnicki, notified us this week that our use of Microsoft CRM has been published as a case study by Microsoft. That is exciting to me. It’s fun to read the article and realize what good work we are doing. Our CRM team is very small and our company is a non-profit. So I don’t think of us as special. But we are a dedicated group who work hard applying modern technologies to serve our customers.
Readers of this blog will enjoy knowing that I and the other CRM programmer use Microsoft Code Contracts to help improve the reliability, maintainability, recoverability, and overall quality of the custom code portion of this solution. I wrote previouslyhttp://codecontracts.info/2009/12/18/code-contracts-improve-microsoft-crm-workflow-code-2/ about the exact way in which we apply code contracts to detect and prevent faults, and resolve them more quickly when they do happen.
Here is the E-Mail from John, with a link to the case study. (more…)
January 13, 2010
On January 12, 2010, I gave a 90 minute presentation on code contracts to my coworkers. I presented the three lessons that are available for download at the following location ContractProgrammingLessons.zip. This file also includes the PowerPoint presentations that I used. I presented the argument that code contracts were a useful tool to improve readability, reliability, correctness, ease of diagnosis, and other software qualities. Later that evening, I presented these ideas to another friend of mine who is an active software developer. Here were some of the reactions I received and my responses to them. And in a few cases, I have noted the response I would have given if I had had the clarity of mind at the time. (more…)