Katy Ereira - Legacy Code - Testing and Safe Refactoring

Delivered by Katy Ereira (@maccath) at the ScotlandPHP Conference 2019 in Edinburgh.
Video content sponsored by Darkmira: darkmira.fr/
Tickets now on sale for this years conference: scophp.co/tickets
Call-for-speakers: cfs.scotlandphp.co.uk
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The paradox: I can't test this code because it's legacy. I need to refractor the code to make it testable. How can I manage that, without breaking existing functionality? I'll need to write some tests, but... argh!
We've all been there! In this talk we'll look at safe ways to refactor and test 'untestable' code - without breaking any existing functionality. Promise!