Working with stubs
A stub delivers indirect inputs to the caller when the stub's methods are called. Stubs are programmed only for the test scope. Stubs may record other information such as how many times they are invoked and so on.
Unit testing a happy path is relatively easier than testing an alternate path. For instance, suppose that you need to simulate a hardware failure or transaction timeout scenario in your unit test, or you need to replicate a concurrent money withdrawal for a joint account use case—these scenarios are not easy to imitate. Stubs help us to simulate these conditions. Stubs can also be programmed to return a hardcoded result; for example, a stubbed bank account object can return the account balance as $100.00.
The following ...
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