Venturing Into the world of RxSwift unit testing
summary
Compares concrete RxSwift testing techniques by building a simple MVVM sign in app wired to a SignInAPI protocol and a fake network, then feeding fake input observables and asserting output streams; demonstrates use of publish and replay subjects, toBlocking (cannot handle nonterminating sequences) with its thread blocking tradeoff, TestScheduler and marble tests for virtual-time precision, and Quick/Nimble for expectations, concluding each method works but trades readability, setup boilerplate, and timing fidelity.
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