[skydhash]

Whenever I have to work with such systems, is usually when I do have to write an interface and have a mock implementation. Iteration is much faster when I don’t have to worry about getting the correct state from something I don’t have control over.

[rmnclmnt]

Yeah that’s what I do also when I have to (and it can be done, not everytime).

But it requires some advanced local testing setup and knowledge to do so, hence my initial remark on this type of developers not being real professionals in the first place…