What alternatives to Redux do you know, and why do they lack its advantages? Why is Redux well-tested, but contexts are not?

Alternatives to Redux:

• MobX — reactive state management with automatic dependency tracking.
• Recoil — state management with atomic units and selectors.
• Zustand — minimalist state manager with a simple API.
• React Context API — built-in mechanism for passing data through the component tree.

Why they don't have all the advantages of Redux:

• Redux offers a strict architecture with a single source of truth and predictability through pure reducers.
• Well-suited for complex applications with a large amount of state and complex logic.
• Developer tools (DevTools) for debugging, time-travel debugging.

Why Redux is well-tested, but contexts are not:

• In Redux, all state management logic is extracted into reducers — pure functions that are easy to test independently of the UI.
• React contexts often contain state and logic inside components, which complicates isolation and testing.
• Contexts can have side effects and are tied to the component lifecycle.

Thus, Redux provides a more modular and predictable approach to state management, making it easier to write and maintain tests.