This is from a while back, but I finally got around to watching it. I think
it is a really good questioning of our assumptions around testing (and of
course it is a controversial talk - it is DHH)

To me, the TL;DR was:

- The main goal of writing code should be creating maintainable code with
clear intent.
- While unit testing is good, it is not a panacea for planning good
architecture or system testing.
- Good unit testing coverage will not spontaneously birth good architecture
and at times it can even work against code clarity.
- System testing is a better representation of how our code works
- Unit testing should support our goals, and not become a goal in and of it
self.

I highly encourage everyone to carve out some time to watch.

http://www.youtube.com/watch?v=9LfmrkyP81M

-- 
Corey Floyd
Software Engineer
Mobile Apps / iOS
Wikimedia Foundation
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