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Serguei Filimonov

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Combating false positive failures in CI

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Scope and the problem

If you experience a CI build turning red due to an intermittent failure, such as in a Capybara test, this post is …

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Roundup of Data and Immutability Resources

Data, Big and Small

As part of Pivotal, Labs associate more and more with the “Big Data” discussions, tools and methods. This is very exciting. Your applications serve users and deliver immediate value, and a whole world of past data …

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Quick abstracts of YAML or JSON documents

When I work with unfamiliar YAML files specifying deployment manifests, product metadata, serialized records, etc. I want to quickly get a sense of a few things:

What is the set of keys in this data structure? If the structure(nested keys)…

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Fact-based state in Rails

Maybe you learned this from experience or you joined a Rich Hickey-esque immutability craze, but one way or another you know state machines are complicated. They couple together a variety of meanings and easily grow out of control as your …

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A Checklist for your Planning Meeting

Checklists?

What do construction, aviation, and internal medicine have in common? They all manage tremendous complexity that has in the last 100 years far surpassed the capacity of any individual to learn despite decades of education and training. Yet major …

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Capybara's save_page with CSS

At Pivotal, we often use Capybara to write a suite of integration tests that navigate a browser through any scenario that can emerge in the application. We use these tests to guard against regressions and to drive out the design …

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