[e-m-p]

Everyone has automated testing. What Arista doesn’t have is 20+ years of features (bloat).

[isostatic]

I'd like to think they do, but Cisco and Juniper sales guys have been rather cagey on the scale of their testing.

[tatersolid]

As a customer of both Cisco and juniper for many years, I can surmise based on experience of their software quality that Cisco has terrible automated testing, and Juniper has less terrible but still terrible automated testing.

Both vendors have a lot of legacy code, so this is somewhat expected. Arista started with modern kernels and used modern development practices from the start.