DependencyTest

请问下，在DependencyTest的单测里面，
1、如果一个依赖的condition成立，相当于vertex 会ready；所以这个condition的成立决定vertex 是否运行？？
2、如果前一个vertex emit 的graphdata 作为 下一个vertex的依赖的条件,后面这个vertex 是否运行取决于 条件是否成立？？只能是vertex 级别是否运行？？
3、condition一般的使用场景是什么样的？

Start by reading or running the DependencyTest unit test mentioned in the issue and trace how dependency conditions relate to vertex readiness and emitted graph data. Document the answers to the three questions, including typical condition use cases, and make the intended execution semantics clear for users.

Written by the indexing model from the issue text.