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An Example Defect
This line made Apple products vulnerable to ‘man in the middle’ attacks over ssh
opensource.apple.com/source/Security/Security-55471/libsecurity_ssl/lib/sslKeyExchange.c
Make it Testable
Extract a function that can be tested in isolation
http://martinfowler.com/articles/testing-culture.html
Write Unit Tests…
… And a Testing Framework
Defect found!
20 line function 100 lines tests and fixture
The Defect in Context:
Development Culture
“The presence of six separate copies of the same algorithm clearly indicates that this bug was not due to a one-time programmer error: This was a pattern. This is evidence of a development culture that tolerates duplicated, untested code.”
http://martinfowler.com/articles/testing-culture.html
What is Development Culture?Version control & Branching Strategy
Code review Strategy
Testing Strategy
Hiring criteria
Development Tool choices
Architecture & Design process
…
Helping the Business to Win
“Firms with high-performing IT organisations were twice as likely to exceed their profitability, market share and productivity goals”
https://puppet.com/resources/white-paper/2014-state-of-devops-report
Analysis
“this research …suggests that version control, test automation, and continuous integration are the most important aspects to implement in the field”
