Question:

Where can we find open, shared, standardized, test case collection for common use cases to speed up the process of developing software tests?
What qualifies a requirement, whether it is possible to break down to smaller common problem which can be a subject of standardized software test?
What is the best way to help developer, to find the right boundaries, in order to make it possible to share the test cases?

Notes:

Yes, this question was already asked, and yes I am still interested to get answer.