"Seems like you are mocking an external system which is out of your system."
It seems to me that is what his design arrangement is. You should build a system that interacts with a different system through a contract.
I'm not a web developer so I'm not familiar with making classes with divs and css to define these contracts between them. I can say that with my own coding I aim for a more functional style of programming, but do not have a emphasis on TDD and leave gaping holes in coverage.
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"Seems like you are mocking an external system which is out of your system."
It seems to me that is what his design arrangement is. You should build a system that interacts with a different system through a contract.
I'm not a web developer so I'm not familiar with making classes with divs and css to define these contracts between them. I can say that with my own coding I aim for a more functional style of programming, but do not have a emphasis on TDD and leave gaping holes in coverage.