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Microtesting Java

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Testing Inside The Application
A good microtest sets up an Interesting Solo Object and probes the behavior of that object to determine that it works the way the programmer wanted it to.
It's just one object, which is interesting (worth testing), and works solo (doesn't rely on others).
Imagine the mechanics needed if the microtest inspected how the object works inside an application.
The application is full of objects, each with various requirements and collaborations and interactions which need to be set up in the right way at the right time.
Can you see how NOT testing in isolation would be a problem?
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