Strong opinions, (bi-)weekly held - with great guests from the C++ community

Each fortnight, or thereabouts, we chat with guests from the C++ community about what they're doing, what interests them, and what's going on in the world of C++.

Hosted by Jon Kalb and Phil Nash.

Please send questions to We're also on Twitter as @cppchat

auto latest = episode<64> {
.title = "If You Change It and You Break It, You’ll Know", /*

This week we chat with Clare Macrae about Approval Testing, testing in general, the challenges (and some solutions to) testing legacy code - as well as highly visual environments like Qt GUIs or image processing apps.

Working with an existing codebase that doesn't have tests can be scary and time consuming. But getting it under test is challenging, too.

Clare explains how Approval Testing helps here, and how it all works.

We also talk about how she has quickly become a sought after speaker, with some tips for first time speakers,

and some more general ideas from Agile and Continuous Delivery circles.

.links = { "C++ Approval Testing", "Approval Tests in general", "Clare's Approval Testing talk at C++ on Sea", "Clare's Meeting C++ talk: 'Quickly Testing Qt Desktop Applications'", /* video not yet available at time of writing */ "Clare's Approval Testing talk at CppCon", /* An evolution of the C++ on Sea talk */ "Approval Tests example code", /* for Reddit question */ "Clare’s new consulting venture" },
.tags = { "C++", "Testing", "Approval Tests", "Legacy Code", "Continuous Delivery" } };

With: Clare Macrae
Recorded: 8 October 2019
Released: 21 November 2019
58 mins 57 secs

A YouTube stream archive of this recording is also available:

< previous episode
Previous episodes:

episode<63> { "All the C++30 Features - but Right Now", { "Sean Baxter" }, 6 / November / 2019y };
episode<62> { "I’m Surprised You Brought up Rotate", { "Sean Parent" }, 17 / October / 2019y };
episode<61> { "You Get to Fix It the next Time", { "Andrei Alexandrescu", "Herb Sutter" }, 12 / October / 2019y };
episode<60> { "The Shape of the Value", { "David Sankel", "Michael Park" }, 28 / September / 2019y };

// ...
// for the complete list of previous episodes, see the Episodes page.