CppCon 2019 has ended
Monday, September 16 • 16:45 - 17:45
Quickly Testing Legacy C++ Code with Approval Tests

Log in to save this to your schedule, view media, leave feedback and see who's attending!

You've inherited some legacy code: it's valuable, but it doesn't have tests, and it wasn't designed to be testable, so you need to start refactoring. But you can't refactor safely until the code has tests, and you can't add tests without refactoring! How can you ever break out of this loop?

Whether Legacy code for you means "old code", "code without tests", or "code you wish to redesign for new features or unit-tests", this talk will enable you to become productive and work safely, quickly.

The simplicity, convenience, ease-of-use, power and flexibility of Llewellyn Falco's "Approval Tests" approach has long been proven in a dozen programming languages. And now all this is now available to C++ developers too!

Clare will present a small but surprisingly effective C++11 library for applying "Approval Tests" to cross-platform C++ code - for both legacy and green-field systems, and with a range of testing frameworks.

She will describe its use in some real-world situations, including how to quickly lock down the behaviour of legacy code. She will show how to quickly achieve good test coverage, even for very large sets of inputs. Finally, she will describe some general techniques she learned along the way.

Attendees will discover some quick, practical techniques to use for common challenges, such as testing outputs containing dates and times, that can be applied very easily using Approval Tests.

avatar for Clare Macrae

Clare Macrae

Director, Clare Macrae Consulting Ltd
Clare has worked in software development for over 30 years, and in C++ for 20 years. Since 2017, she has used her spare time to work remotely with Llewellyn Falco on [ApprovalTests.cpp](https://github.com/approvals/ApprovalTests.cpp), to radically simplify testing of legacy code... Read More →

Monday September 16, 2019 16:45 - 17:45 MDT
Crest 4/5