Success is a continuum; failure is a discrete point at which success breaks down. Failure provides opportunity for growth. Think of the word failure in the same connotation that you would when speaking of testing strength of materials.
Interesting. I don't see success as something that can break down or indeed as a continuum unless it's a highly spiritual perspective ie: the state of continuous winning.
The key I would say is building and thus you build successes to build confidence.
Failure is only when a desired or intended result isn't achieved.
Therefor success breeds success and confidence and growth.
Failure doesn't lead to growth but does lead to recognition of more to learn and if that is taken responsibility for then leads to success and growth.
Looking at testing materials is actually looking for what they can handle ie: successfully.
That which you validate lives and indeed grows.
Learn and grow from success and learn to review and learn some more from failure.